### 12th Standard Chemistry Study material & Free Online Practice Tests - View Model Question Papers with Solutions for Class 12 Session 2019 - 2020 TN Stateboard [ Chapter , Marks , Book Back, Creative & Term Based Questions Papers - Syllabus, Study Materials, MCQ's Practice Tests etc..]

#### 12th Standard Chemistry English Medium Model 5 Mark Creative Questions (New Syllabus) 2020 - by Saroja - Vellore - View & Read

• 1)

Explain refining of nickel by mond's process

• 2)

What is zone refining? Describe the principle involved in the purification of the metal by this method.

• 3)

Distinguish between diamond and graphite.

• 4)

Give a detailed account on allotropes of sulphur.

• 5)

Complete the following equations:
a. 4NaCI + MnO2 + 4H2SO4 $\longrightarrow$?
b. 6XeF4 + 12H2O$\longrightarrow$  ?

#### 12th Standard Chemistry English Medium Model 5 Mark Book Back Questions (New Syllabus) 2020 - by Saroja - Vellore - View & Read

• 1)

The selection of reducing agent depends on the thermodynamic factor: Explain with an example.

• 2)

A hydride of 2nd period alkali metal (A) on reaction with compound of Boron (B) to give a reducing agent (C). identify A , B and C.

• 3)

Deduce the oxidation number of oxygen in hypofluorous acid – HOF.

• 4)

Why do zirconium and Hafnium exhibit similar properties?

• 5)

Why first ionization enthalpy of chromium is lower than that of zinc?

#### 12th Standard Chemistry English Medium Sample 5 Mark Creative Questions (New Syllabus) 2020 - by Saroja - Vellore - View & Read

• 1)

In the extraction of copper, explain the smelting process.

• 2)

What are the various methods by which carbon-di-oxide is prepared?

• 3)

Why is dioxygen a gas but sulphur a solid?

• 4)

Explain the oxidising and reducing property of SO2·

• 5)

An element 'A' occupies group number 15 and period number 3. It reacts with chlorine: to giveBwhich further reacts with chlorine to giveCat 273K. Both Band Care chlorinating agents for organic compounds. C is a better chlorinating agent because it chlorinates metals also.Breacts with SO3and reduces it to SO2' B has a pyramidal shape. C has
trigonal bipyramidal shape by sp3d hybridisation. Identify the element A and the compounds B ' and C. Write the reactions.

#### 12th Standard Chemistry English Medium Sample 5 Mark Book Back Questions (New Syllabus) 2020 - by Saroja - Vellore - View & Read

• 1)

Give the limitations of Ellingham diagram

• 2)

How will you identify borate radical?

• 3)

Deduce the oxidation number of oxygen in hypofluorous acid – HOF.

• 4)

Which is stronger reducing agent Cr2+ or Fe2+?

• 5)

What are hydrate isomers? Explain with an example.

#### 12th Standard Chemistry English Medium Important 5 Mark Creative Questions (New Syllabus) 2020 - by Saroja - Vellore - View & Read

• 1)

In the extraction of copper, explain the smelting process.

• 2)

What is zone refining? Describe the principle involved in the purification of the metal by this method.

• 3)

How are silicates classified? Give an example for each type of silicate.

• 4)

Why is dioxygen a gas but sulphur a solid?

• 5)

Howdoes sulphuric acid react with metals at various conditions

#### 12th Standard Chemistry English Medium Important 5 Mark Book Back Questions (New Syllabus) 2020 - by Saroja - Vellore - View & Read

• 1)

The selection of reducing agent depends on the thermodynamic factor: Explain with an example.

• 2)

A hydride of 2nd period alkali metal (A) on reaction with compound of Boron (B) to give a reducing agent (C). identify A , B and C.

• 3)

Deduce the oxidation number of oxygen in hypofluorous acid – HOF.

• 4)

Why europium (II) is more stable than Cerium (II)?

• 5)

Describe the variable oxidation state of 3d series elements.

#### 12th Standard Chemistry English Medium Model 3 Mark Creative Questions (New Syllabus) 2020 - by Saroja - Vellore - View & Read

• 1)

Explain roasting with an example.

• 2)

What is meant by aluminotherrnitc process?

• 3)

Draw the structure of boric acid.

• 4)

Describe the structure of fullerenes.

• 5)

Explain the structure of ammonia

#### 12th Standard Chemistry English Medium Model 3 Mark Book Back Questions (New Syllabus) 2020 - by Saroja - Vellore - View & Read

• 1)

Explain the electrometallurgy of aluminium

• 2)

Describe the structure of diborane

• 3)

Give a reason to support that sulphuric acid is a dehydrating agent.

• 4)

Which is more stable? Fe3+ or Fe2+ - explain.

• 5)

Give one test to differentiate [Co(NH3)5Cl]SO4 and [Co(NH3)5SO4]Cl.

#### 12th Standard Chemistry English Medium Sample 3 Mark Creative Questions (New Syllabus) 2020 - by Saroja - Vellore - View & Read

• 1)

Explain alkali leaching in the extraction of aluminum,

• 2)

Write the molecular composition of the following ores and mentions it metal : magnetite) calamine and bauxite.

• 3)

Mention the uses of copper

• 4)

How is boron trifluoride obtained from boron trioxide?

• 5)

Give 3 uses of carbon monoxide.

#### 12th Standard Chemistry English Medium Sample 3 Mark Book Back Questions (New Syllabus) 2020 - by Saroja - Vellore - View & Read

• 1)

Explain the electrometallurgy of aluminium

• 2)

Write a short note on hydroboration

• 3)

Give the uses of sulphuric acid.

• 4)

Explain why Cr2+ is strongly reducing while Mn3+ is strongly oxidizing.

• 5)

What is linkage isomerism? Explain with an example

#### 12th Standard Chemistry English Medium Important 3 Mark Creative Questions (New Syllabus) 2020 - by Saroja - Vellore - View & Read

• 1)

What is meant by ammonia leaching?

• 2)

What is the role of depressants in froth flotation process?

• 3)

What are the applications of the Ellingham diagram?

• 4)

Describe the structure of fullerenes.

• 5)

Name a reaction for the estimation of Ozone.

#### 12th Standard Chemistry English Medium Important 3 Mark Book Back Questions (New Syllabus) 2020 - by Saroja - Vellore - View & Read

• 1)

Explain zone refining process with an example using the Ellingham diagram given below

• 2)

Describe the structure of diborane

• 3)

How will you prepare chlorine in the laboratory?

• 4)

Give the uses of argon.

• 5)

Calculate the number of unpaired electrons in Ti3+ , Mn2+ and calculate the spin only magnetic moment.

#### 12th Standard Chemistry English Medium Model 2 Mark Creative Questions (New Syllabus) 2020 - by Saroja - Vellore - View & Read

• 1)

Name the two steps involved in the extraction of crude metal

• 2)

List out the commercial uses of iron.

• 3)

Write the reaction of diboranes with water and alkali.

• 4)

Give the formula of chlorosilazanes. Explain its preparation from SiCI4.

• 5)

Which one is more soluble in diethyl ether, anhydrous Alcl3 or hydrated Alcl3? Explain in terms of bonding.

#### 12th Standard Chemistry English Medium Model 2 Mark Book Back Questions (New Syllabus) 2020 - by Saroja - Vellore - View & Read

• 1)

What is the difference between minerals and ores?

• 2)

Boron does not react directly with hydrogen. Suggest one method to prepare diborane from BF3.

• 3)

Give the uses of helium.

• 4)

What are actinides? Give three example

• 5)

[CuCl4]2- exists while [Cul4]2- does not exist why?

#### 12th Standard Chemistry English Medium Sample 2 Mark Creative Questions (New Syllabus) 2020 - by Saroja - Vellore - View & Read

• 1)

What is meant by concentration?

• 2)

Write the two similarities between calcination and roasting.

• 3)

Name and discuss the principle involved in obtaining silicon of high purity.

• 4)

Mention the physical properties of boranes.

• 5)

What are the uses of silicon tetra chloride?

#### 12th Standard Chemistry English Medium Sample 2 Mark Book Back Questions (New Syllabus) 2020 - by Saroja - Vellore - View & Read

• 1)

Out of coke and CO, which is better reducing agent for the reduction of ZnO? Why?

• 2)

Give the uses of Borax

• 3)

Give the uses of helium.

• 4)

Why Gd3+ is colourles?

• 5)

Give an example of coordination compound used in medicine and two examples of biologically important coordination compounds

#### 12th Standard Chemistry English Medium Important 2 Mark Creative Questions (New Syllabus) 2020 - by Saroja - Vellore - View & Read

• 1)

Name some reducing agents used to convert Metal oxides to metal

• 2)

What is distillation?

• 3)

Explain the formation of boron trifluoride.

• 4)

What is inert pair effect?

• 5)

How is ammonia prepared in the lab?

#### 12th Standard Chemistry English Medium Important 2 Mark Book Back Questions (New Syllabus) 2020 - by Saroja - Vellore - View & Read

• 1)

Boron does not react directly with hydrogen. Suggest one method to prepare diborane from BF3.

• 2)

Explain why fluorine always exhibit an oxidation state of -1?

• 3)

Justify the position of lanthanides and actinides in the periodic table.

• 4)

[CuCl4]2- exists while [Cul4]2- does not exist why?

• 5)

Explain briefly seven types of unit cell

#### 12th Standard Chemistry English Medium Model 1 Mark Creative Questions (New Syllabus) 2020 - by Saroja - Vellore - View & Read

• 1)

Which of the following is incorrect with respect to metallurgy of iron in the blast furnace?

• 2)

Which one of the following element is present as a~ impurity in pig iron?

• 3)

Chemical formula of phosgene is

• 4)

Identify the electron - deficient species

• 5)

Hybridisation of chromium ions and dichromate ions is

#### 12th Standard Chemistry English Medium Model 1 Mark Book Back Questions (New Syllabus) 2020 - by Saroja - Vellore - View & Read

• 1)

Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?

• 2)

The basic structural unit of silicates is (NEET)

• 3)

The basicity of pyrophosphorous acid ( H4P2O5) is

• 4)

Which of the following compounds is colourless?

• 5)

As per IUPAC guidelines, the name of the complex [Co(en)2(ONO)Cl]Cl is

#### 12th Standard Chemistry English Medium Sample 1 Mark Book Back Questions (New Syllabus) 2020 - by Saroja - Vellore - View & Read

• 1)

In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with

• 2)

Sulphide ore is converted to oxide form by using the process_________

• 3)

Which one of the following compounds has similar structure to that of graphite?

• 4)

On moving down the group 13, density ______

• 5)

Which of the following halides of group 15 is not hydrolysed?

#### 12th Standard Chemistry English Medium Sample 1 Mark Book Back Questions (New Syllabus) 2020 - by Saroja - Vellore - View & Read

• 1)

Which of the metal is extracted by Hall-Heroult process?

• 2)

Oxidation state of carbon in its hydrides

• 3)

On hydrolysis, PCl3 gives

• 4)

Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?

• 5)

Which of the following compounds is colourless?

#### 12th Standard Chemistry English Medium Important 1 Mark Creative Questions (New Syllabus) 2020 - by Saroja - Vellore - View & Read

• 1)

Which of the following is incorrect with respect to metallurgy of iron in the blast furnace?

• 2)

In the froth-floatation process the collectors such as pine oil and xanthates, etc enhance.

• 3)

$2PbS+{ 3O }_{ 2 }\longrightarrow 2pbO+{ 2SO }_{ 2 }$ Name the process

• 4)

Malachite has______ composition.

• 5)

Galena is_________

#### 12th Standard Chemistry English Medium Important 1 Mark Book Back Questions (New Syllabus) 2020 - by Saroja - Vellore - View & Read

• 1)

Which one of the following reaction represents calcinations?

• 2)

Which one of the following is not feasible

• 3)

Which of the following metals has the largest abundance in the earth’s crust?

• 4)

The basic structural unit of silicates is (NEET)

• 5)

Duralumin is an alloy of

#### 12th Standard Chemistry One Mark important Questions Book back and Creative - 2020 - by Saroja - Vellore - View & Read

• 1)

Which one of the following is not feasible

• 2)

In the Ellingham diagram, for the formation of carbon monoxide

• 3)

The process of heating of copper pyrites to remove sulphur is called

• 4)

$HgS_{ (s) }+{ O }_{ 2(g) }\longrightarrow { Hg }_{ (l) }+{ SO }_{ 2 }\uparrow$ The above reaction is an example of _________reduction.

• 5)

Which among the following is not a borane?

#### 12 Standard Chemistry English Medium All Chapter Book Back and Creative Two Mark Question 2020 - by Saroja - Vellore - View & Read

• 1)

What are the various steps involved in extraction of pure metals from their ores?

• 2)

What is the role of Limestone in the extraction of Iron from its oxide Fe2O3?

• 3)

What is leaching?

• 4)

List out the commercial uses of iron.

• 5)

Boron does not react directly with hydrogen. Suggest one method to prepare diborane from BF3.

#### 12 Standard Chemistry English Medium All Chapter Book Back and Creative Three Mark Question 2020 - by Saroja - Vellore - View & Read

• 1)

Give the uses of zinc.

• 2)

Explain the following terms with suitable examples.
(i) Gangue
(ii) slag

• 3)

What is meant by aluminotherrnitc process?

• 4)

Support the statement given below with relevant examples

• 5)

Give one example for each of the following
(i) icosogens
(ii) tetragen
(iii) prictogen
(iv) chalcogen

#### 12 Standard Chemistry English Medium All Chapter Book Back and Creative One Mark Question 2020 - by Saroja - Vellore - View & Read

• 1)

Which one of the following reaction represents calcinations?

• 2)

In the Ellingham diagram, for the formation of carbon monoxide

• 3)

Malachite has______ composition.

• 4)

Magnetic separation it is based on the difference in the_________ of the ore and the impurities.

• 5)

The element that does not show catenation among the following p-block elements is

#### 12 Standard Chemistry English Medium All Chapter Book Back and Creative Five Mark Question 2020 - by Saroja - Vellore - View & Read

• 1)

Explain the principle of electrolytic refining with an example.

• 2)

The selection of reducing agent depends on the thermodynamic factor: Explain with an example.

• 3)

Explain froth flotation, with diagram.

• 4)

Explain concentration by magnetic separation with diagram.

• 5)

Write a note on zeolites.

#### 12th Standard Chemistry Book Back and Creative Important Questions All Chapter II 2019-2020 - by Saroja - Vellore - View & Read

• 1)

Considering Ellingham diagram, which of the following metals can be used to reduce alumina? (NEET-2018)

• 2)

Which of the following is not true with respect to Ellingham diagram?

• 3)

Name the process by which elements such as germanium, silicon and galium are refined.

• 4)

Identify the halide ore among the following

• 5)

Ignition mixture used in aluminothermite process is

#### 12th Standard Chemistry Book Back and Creative Important Questions II 2020 - by Saroja - Vellore - View & Read

• 1)

Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?

• 2)

Which of the following reduction is not thermodynamically feasible?

• 3)

$2PbS+{ 3O }_{ 2 }\longrightarrow 2pbO+{ 2SO }_{ 2 }$ Name the process

• 4)

Ignition mixture used in aluminothermite process is

• 5)

Magnesite is_________

#### 12th Standard Chemistry Important Questions II 2019-2020 - by Saroja - Vellore - View & Read

• 1)

Bauxite has the composition

• 2)

Extraction of gold and silver involves leaching with cyanide ion. silver is later recovered by (NEET-2017)

• 3)

The process of heating of copper pyrites to remove sulphur is called

• 4)

Ignition mixture used in aluminothermite process is

• 5)

In acid leaching process. the insoluble sulphide is converted into soluble sulphate and elemental_________

#### 12th Standard Chemistry Important Question All Chapter II 2020 - by Saroja - Vellore - View & Read

• 1)

Which of the metal is extracted by Hall-Heroult process?

• 2)

Zinc is obtained from ZnO by

• 3)

${ Zn }_{ (s) }+2\left[ Au(CN)_{ 2 } \right] ^{ - }_{ (aq) }\longrightarrow \left[ Zn(CN)_{ 4 } \right] ^{ 2- }_{ (aq) }+2Au{ { u }_{ (s) } }$ In the above equation) the oxidation state of metallic;gold is_______

• 4)

Steelis an alloy of___________

• 5)

Galena is_________

#### 12th Standard Chemistry Model Question Paper 2020 - by Saroja - Vellore - View & Read

• 1)

Wolframite ore is separated from tinstone by the process of

• 2)

Zinc is obtained from ZnO by

• 3)

Among the following, one does not belong to calcination, Pick the odd one out.

• 4)

Zinc is extracted from Zinc blende by_________

• 5)

Na[Ag(CN)2] is _________.

#### 12th Standard Chemistry Book Back and Creative Important Questions All Chapter I 2019-2020 - by Saroja - Vellore - View & Read

• 1)

Bauxite has the composition

• 2)

Electrochemical process is used to extract

• 3)

Which one of the following element is present as a~ impurity in pig iron?

• 4)

${ Zn }_{ (s) }+2\left[ Au(CN)_{ 2 } \right] ^{ - }_{ (aq) }\longrightarrow \left[ Zn(CN)_{ 4 } \right] ^{ 2- }_{ (aq) }+2Au{ { u }_{ (s) } }$ In the above equation) the oxidation state of metallic;gold is_______

• 5)

Metal oxide is converted into metal by the:_______ process.

#### 12th Standard Chemistry Book Back and Creative Important Questions I 2020 - by Saroja - Vellore - View & Read

• 1)

Which one of the following is not feasible

• 2)

Flux is a substance which is used to convert

• 3)

Which metal is used for extraction of Au and Ag and also for galvanisation of iron objects?

• 4)

In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with

• 5)

$ZnS+{ 3O }_{ 2 }\overset { \Delta }{ \longrightarrow } 2ZnO+{ 2SO }_{ 2 }\uparrow$ .The above equation is an example for________.

#### 12th Standard Chemistry Important Questions I 2019-2020 - by Saroja - Vellore - View & Read

• 1)

Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?

• 2)

Match items in column - I with the items of column – II and assign the correct code.

 Column-I Column-II A. Cyanide process (i) Ultrapure Ge B Froth floatation process (ii) Dressing of ZnS C Electrolytic reduction (iii) Extraction of Al D Zone refining (iv) Extraction of Au (v) Purification of Ni
• 3)

Magnesite is_________

• 4)

The percentage of carbon in high carbon steel is_________

• 5)

In Hall-Herold process___________act as an, anode.

#### 12th Standard Chemistry Important Question All Chapter I 2020 - by Saroja - Vellore - View & Read

• 1)

The incorrect statement among the following is

• 2)

Which of the following plot gives Ellingham diagram

• 3)

In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with

• 4)

Concentration of copper glance is done by

• 5)

Froth floatation process is suitable for concentrating ______ores.

#### 12th Standard Chemistry Public Model Question Paper IV 2020 - by Saroja - Vellore - View & Read

• 1)

In acid leaching process. the insoluble sulphide is converted into soluble sulphate and elemental_________

• 2)

Oxidation state of carbon in its hydrides

• 3)

Repeated use of which one of the following fertilizers would increase the activity of the soil_______

• 4)

The magnetic moment of Mn2+ ion is

• 5)

A magnetic moment of 1.73BM will be shown by one among the following (NEET)

#### 12th Standard Chemistry Public Model Question Paper III 2020 - by Saroja - Vellore - View & Read

• 1)

Identify the metal that occurs in free state

• 2)

Which of the following statements is not correct?

• 3)

The high reactivity of fluorine is due to_________

• 4)

Permanganate ion changes to ________ in acidic medium

• 5)

Which one of the following complexes is not expected to exhibit isomerism?

#### 12th Standard Chemistry Public Model Question Paper II 2020 - by Saroja - Vellore - View & Read

• 1)

Which of the following is incorrect with respect to metallurgy of iron in the blast furnace?

• 2) Column-I Column-II A Borazole 1 B(OH)3 B Boric acid 2 B3N3H6 C Quartz 3 Na2[B4O5(OH)4]8H2O D Borax 4 SiO2
• 3)

Which among the following ion is not formed?

• 4)

Which one of the following statements related to lanthanons is incorrect?

• 5)

The sum of primary valance and secondary valance of the metal M in the complex [M(en)2(Ox)]Cl isL

#### 12th Standard Chemistry Public Model Question Paper I 2020 - by Saroja - Vellore - View & Read

• 1)

In Hall-Herold process___________act as an, anode.

• 2)

The compound that is used in nuclear reactors as protective shields and control rods is

• 3)

The incorrect statement among the following is_________

• 4)

Which one of the following statements related to lanthanons is incorrect?

• 5)

Which one of the following pairs represents linkage isomers?

#### 12th Standard Chemistry Public Model Question Paper V 2019 - 2020 - by Saroja - Vellore - View & Read

• 1)

The blistered appearance of Cu obtained from the reverberatory furance is due to evolution of

• 2)

The stability of +1 oxidation state increases in the sequence

• 3)

Orthophosphorus acid on heating gives________

• 4)

The magnetic moment of Mn2+ ion is

• 5)

A complex in which the oxidation number of the metal is zero is

#### 12th Standard Chemistry Public Model Question Paper IV 2019 - 2020 - by Saroja - Vellore - View & Read

• 1)

Which of the following is commonly used to produce foam in froth floatation process?

• 2)

The repeating unit in silicone is v

• 3)

The ionisation energy of Ga is higher than that of Al because of_________

• 4)

Which one of the following is not correct?

• 5)

An excess of silver nitrate is added to 100ml of a 0.01M solution of pentaaquachloridochromium(III)chloride. The number of moles of AgCl precipitated would be

#### 12th Standard Chemistry Public Model Question Paper III 2019 - 2020 - by Saroja - Vellore - View & Read

• 1)

Magnetic separation it is based on the difference in the_________ of the ore and the impurities.

• 2)

Which of the following is not sp2 hybridised?

• 3)

Repeated use of which one of the following fertilizers would increase the activity of the soil_______

• 4)

The actinoid elements which show the highest oxidation state of +7 are

• 5)

Which one of the following complexes is not expected to exhibit isomerism?

#### 12th Standard Chemistry Public Model Question Paper II 2019 - 2020 - by Saroja - Vellore - View & Read

• 1)

Sulphide ore is converted to oxide form by using the process_________

• 2)

The geometry at which carbon atom in diamond are bonded to each other is

• 3)

Which of the following is correct?

• 4)

Sc( Z=21) is a transition element but Zinc (z=30) is not becaus

• 5)

Oxidation state of Iron and the charge on the ligand NO in [Fe(H2O)5NO]SO4 are

#### 12th Standard Chemistry Public Model Question Paper I 2019 - 2020 - by Saroja - Vellore - View & Read

• 1)

Name the process by which elements such as germanium, silicon and galium are refined.

• 2)

An aqueous solution of borax is

• 3)

Pick the wrong one among the following

• 4)

Which one of the following ions has the same number of unpaired electrons as present in V3+?

• 5)

A complex in which the oxidation number of the metal is zero is

#### 12th standard chemistry - Metallurgy model question paper - by Chemistry English Medium - New syllabus 2019 - View & Read

• 1)

Which one of the following reaction represents calcinations?

• 2)

Which one of the following is not feasible

• 3)

Extraction of gold and silver involves leaching with cyanide ion. silver is later recovered by (NEET-2017)

• 4)

Considering Ellingham diagram, which of the following metals can be used to reduce alumina? (NEET-2018)

• 5)

Which of the following is used for concentrating ore in metallurgy?

#### 12th standard chemistry - Metallurgy five marks important questions: - by Chemistry English Medium - New syllabus 2019 - View & Read

• 1)

Explain the principle of electrolytic refining with an example.

• 2)

The selection of reducing agent depends on the thermodynamic factor: Explain with an example.

• 3)

Give the limitations of Ellingham diagram

• 4)

Write a short note on electrochemical principles of metallurgy.

• 5)

Explain froth flotation, with diagram.

#### 12th chemistry - Metallurgy three marks important questions - by Chemistry English Medium - New syllabus 2019 - View & Read

• 1)

Explain zone refining process with an example using the Ellingham diagram given below

• 2)

(A) Predict the conditions under which
(i) Aluminium might be expected to reduce magnesia.
(ii) Magnesium could reduce alumina.
(B) Carbon monoxide is more effective reducing agent than carbon below 983K but, above this temperature, the reverse is true –Explain.
(c) it is possible to reduce Fe2O3 by coke at a temperature around 1200K

• 3)

Give the uses of zinc.

• 4)

Explain the electrometallurgy of aluminium

• 5)

Explain the following terms with suitable examples.
(i) Gangue
(ii) slag

#### 12th chemistry - Metallurgy two marks important question - by Chemistry English Medium - New syllabus 2019 - View & Read

• 1)

What is the difference between minerals and ores?

• 2)

What are the various steps involved in extraction of pure metals from their ores?

• 3)

What is the role of Limestone in the extraction of Iron from its oxide Fe2O3?

• 4)

Which type of ores can be concentrated by froth floatation method? Give two examples for such ores.

• 5)

Out of coke and CO, which is better reducing agent for the reduction of ZnO? Why?

#### 12th chemistry - Metallurgy one marks important question - by Chemistry English Medium - New syllabus 2019 - View & Read

• 1)

Roasting of sulphide ore gives the gas (A).(A) is a colourless gas. Aqueous solution of (A) is acidic. The gas (A) is

• 2)

Which of the metal is extracted by Hall-Heroult process?

• 3)

Flux is a substance which is used to convert

• 4)

Cupellation is a process used for the refining of

• 5)

Considering Ellingham diagram, which of the following metals can be used to reduce alumina? (NEET-2018)

#### 12th chemistry - Metallurgy important question - by Chemistry English Medium - New syllabus 2019 - View & Read

• 1)

Bauxite has the composition

• 2)

Roasting of sulphide ore gives the gas (A).(A) is a colourless gas. Aqueous solution of (A) is acidic. The gas (A) is

• 3)

Which one of the following reaction represents calcinations?

• 4)

The metal oxide which cannot be reduced to metal by carbon is

• 5)

Which of the metal is extracted by Hall-Heroult process?

#### 12th chemistry - Metallurgy five marks important question - by Chemistry English Medium - New syllabus 2019 - View & Read

• 1)

Describe the role of the following in the process mentioned.
(i) Silica in the extraction of copper.
(ii) Cryolite in the extraction of aluminium.
(iii) Iodine in the refining of Zirconium.
(iv) Sodium cyanide in froth floatation.

• 2)

Explain the principle of electrolytic refining with an example.

• 3)

The selection of reducing agent depends on the thermodynamic factor: Explain with an example.

• 4)

Give the limitations of Ellingham diagram

• 5)

Write a short note on electrochemical principles of metallurgy.

#### 12th chemistry - Metallurgy three marks important question - by Chemistry English Medium - New syllabus 2019 - View & Read

• 1)

Explain zone refining process with an example using the Ellingham diagram given below

• 2)

(A) Predict the conditions under which
(i) Aluminium might be expected to reduce magnesia.
(ii) Magnesium could reduce alumina.
(B) Carbon monoxide is more effective reducing agent than carbon below 983K but, above this temperature, the reverse is true –Explain.
(c) it is possible to reduce Fe2O3 by coke at a temperature around 1200K

• 3)

Give the uses of zinc.

• 4)

Explain the electrometallurgy of aluminium

• 5)

Explain the following terms with suitable examples.
(i) Gangue
(ii) slag

#### 12th chemistry - Metallurgy two marks important question - by Chemistry English Medium - New syllabus 2019 - View & Read

• 1)

What is the difference between minerals and ores?

• 2)

What are the various steps involved in extraction of pure metals from their ores?

• 3)

What is the role of Limestone in the extraction of Iron from its oxide Fe2O3?

• 4)

Which type of ores can be concentrated by froth floatation method? Give two examples for such ores.

• 5)

Out of coke and CO, which is better reducing agent for the reduction of ZnO? Why?

#### 12th chemistry - Metallurgy one marks important questions - by Chemistry English Medium - New syllabus 2019 - View & Read

• 1)

Bauxite has the composition

• 2)

Roasting of sulphide ore gives the gas (A).(A) is a colourless gas. Aqueous solution of (A) is acidic. The gas (A) is

• 3)

Which one of the following reaction represents calcinations?

• 4)

The metal oxide which cannot be reduced to metal by carbon is

• 5)

Which of the metal is extracted by Hall-Heroult process?

#### 12th Chemistry - Chemistry In Everyday Life - Two Marks Study Materials - by 8682895000 - View & Read

• 1)

Which chemical is responsible for the antiseptic properties of dettol.

• 2)

What are antibiotics?

• 3)

Name one substance which can act as both analgesic and antiphyretic

• 4)

Write a note on synthetic detergents

• 5)

How do antiseptics differ from disinfectants?

#### 12th Chemistry Biomolecules - Two Marks Study Materials - by 8682895000 - View & Read

• 1)

What type of linkages hold together monomers of DNA?

• 2)

Give the differences between primary and secondary structure of proteins.

• 3)

Name the Vitamins whose deficiency cause i) rickets ii) scurvy

• 4)

Write the Zwitter ion structure of alanine

• 5)

Give any three difference between DNA and RNA

#### 12th Chemistry Organic Nitrogen Compounds - Two Marks Study Materials - by 8682895000 - View & Read

• 1)

Write down the possible isomers of the C4H9NO2 give their IUPAC names

• 2)

There are two isomers with the formula  CH3NO2. How will you distinguish between them?

• 3)

What happends when
i. 2 – Nitropropane boiled with HCl
ii. Nitrobenezenelectrolytic reduction in strongly acidic medium.
iii. Oxidation of tert – butylamine with KMnO4
iv. Oxidation of acetoneoxime with trifluoroperoxy acetic acid.

• 4)

How will you convert nitrobenzene into
i. 1,3,5 - trinitrobenzene
ii. o and p- nitrophenol
iii. m – nitro aniline
iv. azoxybenzene
v. hydrozobenzene
vi. N – phenylhydroxylamine
vii. aniline

• 5)

Identify compounds A,B and C in the following sequence of reactions.
i) ${ C }_{ 6 }{ H }_{ 5 }NO_{ 2 }\overset { Fe/HCL }{ \longrightarrow } A\overset { HN{ O }_{ 2 } }{ \underset { 273K }{ \longrightarrow } } B\overset { { C }_{ 6 }{ H }_{ 5 }OH }{ \longrightarrow } C$
ii) ${ C }_{ 6 }{ H }_{ 5 }N_{ 2 }cl\overset { CuCN }{ \longrightarrow } A\overset { H_{ 2 }O/H^{ + } }{ \longrightarrow } B\overset { NH_3 }{ \longrightarrow } C$

iii) ${ C }{ H }_{ 3 }{ C }{ H }_{ 2 }I\overset { NaCN}{ \longrightarrow } A\overset {OH^-}{ \underset {Partial hydrolysis}{ \longrightarrow } } B\overset {NaOH+Br_2 }{ \longrightarrow } C$
iv) ${ C }{ H }_{ 3 }NH_{ 2 }\overset { CH_3 Br }{ \longrightarrow } A\overset { CH_{ 3 }COCl}{ \longrightarrow } B\overset { B_2H_6 }{ \longrightarrow } C$
v) ${ C }_{ 6 }{ H }_{ 5 }NH_{ 2 }\overset { (CH_{ 3 }CO)_{ 2 }O }{ \underset { Pyridine }{ \longrightarrow } } A\overset { HNO_{ 3 } }{ \underset { H_{ 2 }SO_{ 4 },288K }{ \longrightarrow } } B\overset { { H }_{ 2 }O/{ H }^{ + } }{ \longrightarrow C }$
vi)

vii) ${ C }{ H }_{ 3 }CN_{ 2 }NC\overset { HgO }{ \longrightarrow } A\overset { H_{ 2 }O }{ \longrightarrow } B\overset { i)\quad NaN{ O }_{ 2 }/HCL }{ \underset { ii){ \quad H }_{ 2 }O }{ \longrightarrow } }$

#### 12th Chemistry Carbonyl Compounds - Two Marks Study Materials - by 8682895000 - View & Read

• 1)

How is propanoic acid is prepared starting from
(a) an alcohol
(b) an alkylhalide
(c) an alkene

• 2)

A Compound (A) with molecular formula C2H3N on acid hydrolysis gives(B) which reacts with thionylchloride to give compound(C). Benzene reacts with compound (C) in presence of anhydrous AlCl3 to give compound(C). Compound (C) on reduction with gives (D). Identify (A), (B), (C) and D. Write the equations.

• 3)

Identify X and Y.
${ CH }_{ 3 }CO{ CH }_{ 2 }{ CH }_{ 2 }COO{ C }_{ 2 }{ H }_{ 5 }\overset { { CH }_{ 3 }MBgr }{ \longrightarrow } X\overset { { H }_{ 3 }{ O }^{ + } }{ \longrightarrow } Y$

• 4)

Identify A, B and C

• 5)

A hydrocarbon A (molecular formula C8H10)on ozonolysis gives B (C4H6O2) only. Compound C (C3H5Br) on treatment with magnesium in dry ether gives (D) which on treatment with CO2 followed by acidification gives(C). Identify A) Band C.

#### 12th Chemistry Hydroxy Compounds and Ethers - Two Marks Study Materials - by 8682895000 - View & Read

• 1)

Identify the product (s) is / are formed when 1 – methoxy propane is heated with excess HI. Name the mechanism involved in the reaction

• 2)

Draw the major product formed when 1-ethoxyprop-1-ene is heated with one equivalent of HI

• 3)

Suggest a suitable reagent to prepare secondary alcohol with identical group using Grignard reagent.

• 4)

What is the major product obtained when two moles of ethyl magnesium bromide is treated with methyl benzoate followed by acid hydrolysis.

• 5)

Predict the major product, when 2-methyl but -2-ene is converted into an alcohol in each of the following methods.
(i) Acid catalysed hydration
(ii) Hydroboration
(iii) Hydroxylation using bayers reagent

#### 12th Chemistry Surface Chemistry - Two Marks Study Materials - by 8682895000 - View & Read

• 1)

Give two important characteristics of physiscorption

• 2)

Differentiate physisorption and chemisorption

• 3)

In case of chemisorption, why adsorption first increases and then decreases with temperature?

• 4)

Which will be adsorbed more readily on the surface of charcoal and why; NH3 or CO2?

• 5)

Heat of adsorption is greater for chemisorptions than physisorption. Why?

#### 12th Chemistry Electro Chemistry - Two Marks Study Materials - by 8682895000 - View & Read

• 1)

Define anode and cathode

• 2)

Why does conductivity of a solution decrease on dilution of the solution

• 3)

State Kohlrausch Law. How is it useful to determine the molar conductivity of weak electrolyte at infinite dilution.

• 4)

Describe the electrolysis of molten NaCl using inert electrodes

• 5)

State Faraday’s Laws of electrolysis

#### 12th Chemistry Ionic Equilibrium - Two Marks Study Materials - by 8682895000 - View & Read

• 1)

What are lewis acids and bases? Give two example for each.

• 2)

Discuss the Lowery – Bronsted concept of acids and bases.

• 3)

Indentify the conjugate acid base pair for the following reaction in aqueous solution
i) HS- (aq) + HF $\rightleftharpoons$ F-(aq) + H2S(aq)
ii) HPO2-+ SO32- $\rightleftharpoons$ PO43-+HSO3-
iii) NH4+ CO32-  $\rightleftharpoons$ NH3+HCO3-

• 4)

Account for the acidic nature of HClO4. In terms of Bronsted – Lowry theory, identify its conjugate base.

• 5)

When aqueous ammonia is added to CuSO4 solution, the solution turns deep blue due to the formation of tetramminecopper (II) complex, ${ [Cu({ H }_{ 2 }O)] }_{ (aq) }^{ 2+ }\rightleftharpoons 4{ NH }_{ 3 }(aq)\rightleftharpoons { [Cu{ ({ NH }_{ 3 }) }_{ 4 }] }_{ (aq) }^{ 2+ }$ among H2O and NH3 Which is stronger Lewis base.

#### 12th Chemistry Chemical Kinetics - Two Marks Study Materials - by 8682895000 - View & Read

• 1)

Define average rate and instantaneous rate

• 2)

Define rate law and rate constant

• 3)

Derive integrated rate law for a zero order reaction A$\longrightarrow$ product

• 4)

Define half life of a reaction. Show that for a first order reaction half life is independent of initial concentration

• 5)

What is an elementary reaction? Give the differences between order and molecularity of a reaction

#### 12th Chemistry Solid State - Two Marks Study Materials - by 8682895000 - View & Read

• 1)

Define unit cell

• 2)

Give any three characteristics of ionic crystals.

• 3)

Differentiate crystalline solids and amorphous solids.

• 4)

classify the following solids
a. P4
b. Brass
c. diamond
d. NaCl
e. Iodine

• 5)

Explain briefly seven types of unit cell

#### 12th Chemistry Coordination Chemistry - Two Marks Study Materials - by 8682895000 - View & Read

• 1)

Write the IUPAC names for the following complexes
i) Na2[Ni(EDTA)]
II) [Ag(CN)2)
iii) [Co9en)3]2(SO4)3
iv)[Co(ONO)(NH3)5]2+
v)[Pt(NH3)2Cl(NO2)]

• 2)

Write the formula for the following coordination compounds.
a) potassiumhexacyanidoferrate(II)
b) petacarbonyliron(0)
c) pentaamminenitrito −k−N-cobalt(III)ion
d) hexaamminecobalt(III)sulphate
e) sodiumtetrafluoridodihydroxidochromate(III)

• 3)

Arrange the following in order of increasing molar conductivity
(i) Mg[Cr(NH3)(Cl)5]
(ii) Cr(NH3)5Cl]3[CoF6]2
(iii) [Cr(NH3)3Cl3]

• 4)

Ni2+ is identified using alcoholic solution of dimethyl glyoxime. Write the structural formula for the rosy red precipitate of a complex formed in the reaction.

• 5)

[CuCl4]2- exists while [Cul4]2- does not exist why?

#### 12th Chemistry Transition and Inner Transition Elements - Two Marks Study Materials - by 8682895000 - View & Read

• 1)

What are transition metals? Give four examples.

• 2)

Explain the oxidation states of 3d series elements.

• 3)

What are inner transition elements?

• 4)

Justify the position of lanthanides and actinides in the periodic table.

• 5)

What are actinides? Give three example

#### 12th Chemistry p - Block Elements II - Two Marks Study Materials - by 8682895000 - View & Read

• 1)

What is inert pair effect?

• 2)

Chalcogens belongs to p-block. Give reason.

• 3)

Explain why fluorine always exhibit an oxidation state of -1?

• 4)

Give the oxidation state of halogen in the following.
a) OF2
b) O2F2
c) Cl2O3
d) I2O4

• 5)

What are interhalogen compounds? Give examples.

#### 12th Chemistry p - Block Elements I - Two Marks Study Materials - by 8682895000 - View & Read

• 1)

Write a short note on anamolous properties of the first element of p-block

• 2)

Describe briefly allotropism in p- block elements with specific reference to carbon

• 3)

Boron does not react directly with hydrogen. Suggest one method to prepare diborane from BF3.

• 4)

Give the uses of Borax

• 5)

What is catenation ? describe briefly the catenation property of carbon

#### 12th Chemistry Metallurgy - Two Marks Study Materials - by 8682895000 - View & Read

• 1)

What is the difference between minerals and ores?

• 2)

What are the various steps involved in extraction of pure metals from their ores?

• 3)

What is the role of Limestone in the extraction of Iron from its oxide Fe2O3?

• 4)

Which type of ores can be concentrated by froth floatation method? Give two examples for such ores.

• 5)

Out of coke and CO, which is better reducing agent for the reduction of ZnO? Why?

#### 12th Chemistry - Full Portion Five Marks Questions - by 8682895000 - View & Read

• 1)

Explain the principle of electrolytic refining with an example.

• 2)

Write a note on zeolites.

• 3)

How will you convert boric acid to boron nitride?

• 4)

Suggest a reason why HF is a weak acid, whereas binary acids of the all other halogens are strong acids.

• 5)

A solution of [Ni(H2O)6]2+ 2is green, whereas a solution of [Ni(CN)4]2- is colorless -Explain

#### 12th Chemistry - Full Portion Three Marks Question Paper - by 8682895000 - View & Read

• 1)

Give the uses of zinc.

• 2)

Explain the following terms with suitable examples.
(i) Gangue
(ii) slag

• 3)

Before reduction, the ore is first convertedI into the oxide of metal of interest. Gtve reason

• 4)

Write a short note on hydroboration

• 5)

How will you prepare chlorine in the laboratory?

#### 12th Chemistry - Full Portion Two Marks Question Paper - by 8682895000 - View & Read

• 1)

What is the role of Limestone in the extraction of Iron from its oxide Fe2O3?

• 2)

Write a note on Fisher tropsch synthesis

• 3)

What is inert pair effect?

• 4)

Chalcogens belongs to p-block. Give reason.

• 5)

Explain the oxidation states of 3d series elements.

#### 12th Chemistry - Public Model Question Paper 2019 - 2020 - by Saroja - Vellore - View & Read

• 1)

Which metal is used for extraction of Au and Ag and also for galvanisation of iron objects?

• 2)

The basic structural unit of silicates is (NEET)

• 3)

Thr hybridisation and shape of SF6 is respectively?

• 4)

Which of the following oxidation states is most common among the lanthanoids?

• 5)

A complex has a molecular formula MSOCl. 6HO42.The aqueous solution of it gives white precipitate with Barium chloride solution and no precipitate is obtained when it is treated with silver nitrate solution. If the secondary valence of the metal is six, which one of the following correctly represents the complex?

#### 12th Chemistry - Chemistry In Everyday Life Model Question Paper 1 - by 8682895000 - View & Read

• 1)

Drugs that bind to the receptor site and inhibit its natural function are called

• 2)

Natural rubber has

• 3)

Which one of the following is a bio-degradable polymer?

• 4)

Which among the following is a modification of penicillin?

• 5)

Which one of the following is employed as antihistamine?

#### 12th Chemistry - Biomolecules Model Question Paper 1 - by 8682895000 - View & Read

• 1)

The central dogma of molecular genetics states that the genetic information flows from

• 2)

Among the following the achiral amino acid is

• 3)

Vitamin B2 is also known as

• 4)

Which is a monosaccharide among the following?

• 5)

Identify the reducing sugar.

#### 12th Chemistry - Organic Nitrogen Compounds Model Question Paper 1 - by 8682895000 - View & Read

• 1)

CH3CH2 Br $\overset { aqNaOH }{ \underset { \Delta }{ \longrightarrow } } A\overset { { KMnO }_{ 4 }{ /H }^{ + } }{ \underset { \Delta }{ \longrightarrow } } B\overset { { NH }_{ 3 } }{ \underset { \Delta }{ \longrightarrow } } C\overset { { Br }_{ 2 }/NaOH }{ \longrightarrow } D'D'is$

• 2)

Which of the following reaction is not correct.

• 3)

C5HN13 reacts with HNO2 to give an optically active compound – The compound is

• 4)

Which among the following reactions will give a secondary amine?

• 5)

Identify the product of the following reaction.
CH3Mg Br + CI - CN ⟶ ?

#### 12th Chemistry - Carbonyl Compounds Model Question Paper 1 - by 8682895000 - View & Read

• 1)

In the following reaction, $HC\equiv \overset { { H }_{ 2 }{ SO }_{ 4 } }{ \underset { HgS{ O }_{ 4 } }{ \longrightarrow } } X$ Product ‘X’ will not give

• 2)

Assertion: 2,2 – dimethyl propanoic acid does not give HVZ reaction.
Reason: 2 – 2, dimethyl propanoic acid does not have – - hydrogen atom

• 3)

Which one of the following reduces tollens reagent

• 4)

Which among the following on oxidation with alk.KMnO4 will give butanone?

• 5)

Which of the following acids do not exhibit optical isomerism?

#### 12th Chemistry - Hydroxy Compounds and Ethers Model Question Paper 1 - by 8682895000 - View & Read

• 1)

In the reaction sequence, Ethane $\overset { HOCl }{ \longrightarrow } A\overset { x }{ \longrightarrow }$ ethan -1, 2 - diol . A and X respectively are

• 2)

Carbolic acid is

• 3)

(CH3)3-C-CH(OH) CH3 $\overset { con{ H }_{ 2 }{ SO }_{ 4 } }{ \longrightarrow }$X (major product)

• 4)

Which among the following statement are correct with regard to alkyl halides?

• 5)

Which one of the following would not react with cone. HCI and anhy. ZnCl2 at room temperature?

#### 12th Chemistry - Surface Chemistry Model Question Paper 1 - by 8682895000 - View & Read

• 1)

For freudlich isotherm a graph of log $\frac{x}{m}$ is plotted against log P. The slope of the line and its y – axis intercept respectively corresponds to

• 2)

Statement :
To stop bleeding from an injury, ferric chloride can be applied. Which comment about the statement is justified?

• 3)

The phenomenon observed when a beam of light is passed through a colloidal solution is

• 4)

According to Freundlich adsorption isotherm,

• 5)

Pick the odd one out.

#### 12th Chemistry - Electro Chemistry Model Question Paper 1 - by 8682895000 - View & Read

• 1)

The number of electrons that have a total charge of 9650 coulombs is

• 2)

The molar conductivity of a 0.5 mol dm-3 solution of AgNO3 with electrolytic conductivity of 5.76 ×10−3 S cm−1at 298 K is

• 3)

A current strength of 3.86 A was passed through molten Calcium oxide for 41minutes and 40 seconds. The mass of Calcium in grams deposited at the cathode is (atomic mass of Ca is 40g / mol and 1F = 96500C).

• 4)

Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because

• 5)

In H2-Ofuel cell the reaction occur at cathode is

#### 12th Chemistry - Ionic Equilibrium Model Question Paper 1 - by 8682895000 - View & Read

• 1)

Concentration of the Ag+ ions in a saturated solution of Ag2C2O4 is 2.24 ×10-4mol L-1 solubility product of Ag2C2O4 is

• 2)

Which of the following fluro – compounds is most likely to behave as a Lewis base?

• 3)

The percentage of pyridine (C5H5N) that forms pyridinium ion (C5H5NH) in a 0.10M aqueous pyridine solution (Kb for C5H5N= 1.7×10-9) is

• 4)

MY and NY3, are insoluble salts and have the same Ksp values of 6.2 ×10-13 at room temperature. Which statement would be true with regard to MY and NY3?

• 5)

Pick the strongest conjugate base among the following

#### 12th Chemistry - Chemical Kinetics Model Question Paper 1 - by 8682895000 - View & Read

• 1)

For the reaction, 2NH3 ⟶ N2 + 3H2, if $\frac { -d[NH_{ 3 }] }{ dt }$=k1[NH3], $\frac { d[N_{ 2 }] }{ dt } =k_{ 2 }[NH_{ 3 }],\frac { d[{ H }_{ 2 }] }{ dt }$=k3[NH3] then the relation between k1, k2 and k3 is

• 2)

For a reaction Rate = kacetone[]32 then unit of rate constant and rate of reaction respectively is

• 3)

In a reversible reaction, the enthalpy change and the activation energy in the forward direction are respectively −x kJ mol-4 and kJ mol-1 Therefore , the energy of activation in the backward direction is

• 4)

For the reaction, 2N2O5 ⟶4 NO2+O2, select the correct statement.

• 5)

The depletion of ozone involves the following steps:
Step 1: O2 +O $\overset { { k }_{ 1 } }{ \underset { { k }_{ 2 } }{ \rightleftharpoons } }$ O3 (fast)
Step 2: O3 +O $\overset { k }{ \longrightarrow }$ 2O2 (slow)
The predicted order of the reaction will be

#### 12th Chemistry - Solid State Model Question Paper 1 - by 8682895000 - View & Read

• 1)

In calcium fluoride, having the flurite structure the coordination number of Ca2+ ion and F- Ion are (NEET)

• 2)

The number of carbon atoms per unit cell of diamond is

• 3)

A solid compound XY has NaCl structure. if the radius of the cation is 100pm , the radius of the anion will be

• 4)

An example of metal deficiency defect

• 5)

Which one of the following crystal has 8: 8 structure?

#### 12th Chemistry - Coordination Chemistry Model Question Paper 1 - by 8682895000 - View & Read

• 1)

IUPAC name of the complex K3[Al(C2O4)3] is

• 2)

Crystal field stabilization energy for high spin d5 octahedral complex is

• 3)

Which one of the following pairs represents linkage isomers?

• 4)

Structural formula of tetra aquadichlorideo Chromium (III) chloride.

• 5)

The spin only magnetic moment of [Mnfsr4]2- is 5.9 BM. Geometry of the complex ion is

#### 12th Chemistry - Transition and Inner Transition Elements Model Question Paper 1 - by 8682895000 - View & Read

• 1)

The magnetic moment of Mn2+ ion is

• 2)

Which of the following compounds is colourless?

• 3)

Which of the following does not give oxygen on heating?

• 4)

The highest possible oxidation state shown by osmium in its compound is

• 5)

Ce (Z=58) and Yb (Z=70) exhibits stable +4 and +2 oxidation states respectively. This is because

#### 12th Chemistry - p - Block Elements - II Model Question Paper 1 - by 8682895000 - View & Read

• 1)

On hydrolysis, PCl3 gives

• 2)

The basicity of pyrophosphorous acid ( H4P2O5) is

• 3)

The correct order of the thermal stability of hydrogen halide is

• 4)

Thr hybridisation and shape of SF6 is respectively?

• 5)

Which one of the following orders is not in accordance with the property stated against it?

#### 12th Chemistry - p - Block Elements - I Model Question Paper 1 - by 8682895000 - View & Read

• 1)

The element that does not show catenation among the following p-block elements is

• 2)

Carbon atoms in fullerene with formula C60 have

• 3)

The basic structural unit of silicates is (NEET)

• 4)

Chemical formula of phosgene is

• 5)

SiO44- ion has ____ geometry.

#### 12th Chemistry - Metallurgy Model Question Paper 1 - by 8682895000 - View & Read

• 1)

Which of the metal is extracted by Hall-Heroult process?

• 2)

Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?

• 3)

Wolframite ore is separated from tinstone by the process of

• 4)

Extraction of gold and silver involves leaching with cyanide ion. silver is later recovered by (NEET-2017)

• 5)

Which of the following is incorrect with respect to metallurgy of iron in the blast furnace?

#### 12th Chemistry - Chemistry In Everyday Life Model Question Paper - by Saroja - Vellore - View & Read

• 1)

Dettol is the mixture of

• 2)

Non stick cook wares generally have a coating of a polymer, whose monomer is

• 3)

Mental diseases like schizophrenia are treated using _______ drugs.

• 4)

________ is an antipyretic.

• 5)

The monomer unit of natural rubber is _________

#### 12th Chemistry - Biomolecules Model Question Paper - by Saroja - Vellore - View & Read

• 1)

Which one given below is a non-reducing sugar?

• 2)

The pyrimidine bases present in DNA are

• 3)

Among the following L-serine is

• 4)

Name the base present only in RNA

• 5)

The amino acid without chiral carbon is

#### 12th Chemistry - Organic Nitrogen Compounds Model Question Paper - by Saroja - Vellore - View & Read

• 1)

The method by which aniline cannot be prepared is

• 2)

The order of basic strength for methyl substituted amines in aqueous solution is

• 3)

Identify X in the sequence give below

• 4)

The above structure represents

• 5)

Electrolytic reduction of nitrobenzene in strongly acidic medium gives

#### 12th Chemistry - Carbonyl Compounds Model Question Paper - by Saroja - Vellore - View & Read

• 1)

Reaction of acetone with one of the following reagents involves nucleophilic addition followed by elimination of water. The reagent is

• 2)

Which one of the following reduces tollens reagent

• 3)

Assertion : p – N, N – dimethyl aminobenzaldehyde undergoes benzoin condensation
Reason : The aldehydic (-CHO) group is meta directing

• 4)

Of the following, which is the product formed when cyclohexanone undergoes aldol condensation followed by heating?

• 5)

Identify 'X'.

#### 12th Chemistry - Hydroxy Compounds and Ethers Model Question Paper - by Saroja - Vellore - View & Read

• 1)

Which one of the following is the strongest acid

• 2)

(CH3)3-C-CH(OH) CH3 $\overset { con{ H }_{ 2 }{ SO }_{ 4 } }{ \longrightarrow }$X (major product)

• 3)

Assertion : Phenol is more reactive than benzene towards electrophilic substitution reaction
Reason : In the case of phenol, the intermediate arenium ion is more stabilized by resonance

• 4)

One mole of an organic compound (A) with the formula C3H8O reacts completely with two moles of HI to form X and Y. When Y is boiled with aqueous alkali it forms Z. Z answers the iodoform test. The compound (A) is

• 5)

Pick out the odd one among the following

#### 12th Chemistry - Surface Chemistry Model Question Paper - by Saroja - Vellore - View & Read

• 1)

Hair cream is

• 2)

The coagulation values in millimoles per litre of the electrolytes used for the coagulation of AS2S3 are given below
(I) (NaCl)=52 (II) ((BaCl2)=0.69 (III) (MgSO4)=0.22
The correct order of their coagulating power is

• 3)

Which among the following does not affect adsorption?

• 4)

Which one of the following is correctly matched?

• 5)

The phenomenon of scattering of light by the sol particles is called

#### 12th Chemistry - Electro Chemistry Model Question Paper - by Saroja - Vellore - View & Read

• 1)

Faradays constant is defined as

• 2)

While charging lead storage battery

• 3)

A conductivity cell has been calibrated with a 0.01M, 1:1 electrolytic solution (specific conductance ( k =1.25x10-3cm-1) in the cell and the measured resistance was 800 Ω at 25oC. The cell constant is,

• 4)

Cell equation : A + 2B- $\rightarrow$A2++2B;
A2+ + 2e- $\rightarrow$AEo =+0.34V and log10 K = 15.6 at 300K for cell reactions find Eo for
B1 + e $\rightarrow$

• 5)

Which among the following is the strongest reducing agent?

#### 12th Chemistry - Ionic Equilibrium Model Question Paper - by Saroja - Vellore - View & Read

• 1)

Conjugate base for bronsted acids H2O and HF are

• 2)

If the solubility product of lead iodide is 3.2 ×10-8 , its solubility will be

• 3)

Pick out the incorrect statement regarding Lewis acids and bases

• 4)

Krepresents

• 5)

pH of buffer depends upon concentration of

#### 12th Chemistry - Chemical Kinetics Model Question Paper - by Saroja - Vellore - View & Read

• 1)

The decomposition of phosphine (PH3) on tungsten at low pressure is a first order reaction. It is because the (NEET)

• 2)

For a reaction Rate = kacetone[]32 then unit of rate constant and rate of reaction respectively is

• 3)

In a first order reaction $x\longrightarrow y$ if k is the rate constant and the initial concentration of the reactant x is 0.1M, then, the half life is

• 4)

Predict the rate law of the following reaction based on the data given below
$2A+B\longrightarrow C+3D$

 Reaction number [A] (min) [B] (min) Initial rate (M s-1) 1 0.1 0.1 x 2 0.2 0.1 2x 3 0.1 0.2 4x 4 0.2 0.2 8x
• 5)

During the decomposition of H2O2 to give dioxygen, 48 g O2 is formed per minute at certain point of time. The rate of formation of water at this point is

### TN Stateboard Education Study Materials

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#### 12th Stateboard Chemistry 2019 - 2020 Academic Monthly Syllabus - by Saroja - Vellore Aug 02, 2019 Aug 02, 2019

Chemistry 2019 - 2020 Academic Monthly Syllabus

### TN Stateboard Updated Class 12th Chemistry Syllabus

#### Metallurgy

Introduction - Occurrence of metals - Concentration of ores - Extraction of crude metal - Thermodynamic principle of metallurgy - Electrochemical principle of metallurgy - Refining process - Application metals -

#### p - Block Elements - I

Introduction - General trends in properties of p-block elements - Group 13 (Boron group) elements - Group 14 (Carbon group) elements -

#### p - Block Elements - II

Introduction - Group 15 (Nitrogen group) elements - oxygen - Group 17 (Halogen group) elements - Group 18 (Inert gases) elements -

#### Transition and Inner Transition Elements

Introduction - Position of d- block elements in the periodic table - Electronic configuration - General trend in properties - important compound of Transition elements

#### Coordination Chemistry

Introduction - Coordination compounds and double salts - Werner's theory of coordination compounds - Definition of important terms pertaining to co-ordination compounds - Nomenclature of coordination compounds - Isomerism in coordination compounds - Theories of coordination compound

#### Solid State

Introduction - General characteristics of solids - Classification of solids - Classification of crystalline solids - Classification of crystalline solids - Primitive and non-primitive unit cell - Packing in crystals - Imperfection in solids

#### Chemical Kinetics

Introduction - Rate of a chemical reaction - Molecularity - The integrated rate equation - Half-life period of a reaction - Collision theory - Arrhenius equation – The effect of temperature on reaction rate - Factors affecting the reaction rate

#### TN StateboardStudy Material - Sample Question Papers with Solutions for Class 12 Session 2019 - 2020

Latest Sample Question Papers & Study Material for class 12 session 2019 - 2020 for Subjects Maths, Physics, Biology, Computer Science, Business Maths, Economics, Commerce, Accountancy, History, Computer Applications, Computer Technology in PDF form to free download [ available question papers ] for practice. Download QB365 Free Mobile app & get practice question papers.

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