12th Standard English Medium Chemistry Reduced Syllabus Creative One mark Question with Answer key - 2021(Public Exam )

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Questions:

Multiple Choice Question

50 x 1 = 50

Nitro-acinitro tautomerism is exhibited by ____________

(a)

nitromethane

(b)

nitrobenzene

(c)

chloropicrin

(d)

o-toluidine

Sorbitol and Mannitol are ________

(a)

isomers

(b)

polymers

(c)

epimers

(d)

dimers

The IUPAC name of the compound
\({ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ CH } -{ CH }_{ 2 }-{ NO }_{ 2 }\)

(a)

1-nitro propane

(b)

1-nitro 2-methyl propane

(c)

1-nito-2, 2-dimethyl propane

(d)

2-nitro-2-methyl propane

Cellulose is an example of _____ polymer.

(a)

synthetic

(b)

Natural

(c)

semisynthetic

(d)

none of the above

Pick out the wrong statement among the following.

(a)

Antipyretics is used to reduce the body temperature

(b)

Analgesics are drugs used to relieve pain

(c)

Milk of magnesia is used to relieve symptoms of heat burn

(d)

Tetracyclines are antifertility drugs

Which among the following is a modification of penicillin?

(a)

amoxicillin

(b)

catecholamine

(c)

Crythromycin

(d)

all the above

Which among the following reactions will give a secondary amine?

(a)

\(\mathrm{CH}_{3} \mathrm{CONH}_{2} \stackrel{\mathrm{Br}_{2} / \mathrm{KOH}}{\longrightarrow}\)

(b)

\(\mathrm{CH}_{3} \mathrm{CONH}_{2} \stackrel{\mathrm{LiAlH}_{4}}{\longrightarrow}\)

(c)

\({ CH }_{ 3 }CN\xrightarrow [ Na/{ C }_{ 2 }{ H }_{ 5 }OH ]{ } \)

(d)

\(\mathrm{CH}_{3} \mathrm{NC} \stackrel{\mathrm{LiAlH}_{4}}{\longrightarrow}\)

The helical structure of protein is stabilised by_________

(a)

peptide bonds

(b)

disulphide bonds

(c)

hydrogen bonds

(d)

Vanderwaals inter action

Oxidation of gluconic acid with nitric acid gives__________

(a)

saccharicacid

(b)

CO₂ and water

(c)

acetic acid

(d)

maltose

10.

Pyridoxine is__________

(a)

vitamin B₆

(b)

vitamin B₇

(c)

vitamin B₉

(d)

vitamin B₅

11.

When cellulose is boiled with dilute H₂SO₄ it gives

(a)

D-glucose

(b)

D-fructose

(c)

Dextrine

(d)

Starch

12.

Carbohydrates are

(a)

polyhydroxy aldehydes

(b)

polyhydroxy ketones

(c)

polyhydroxy acids

(d)

both (a) and (b)

13.

A dipeptide does not have

(a)

two peptide units

(b)

portions of two amino acids

(c)

an amino group

(d)

salt like structure

14.

The zinc - copper cell has emf of _______.

(a)

(b)

2.1 V

(c)

1.1V

(d)

-1.1 V

15.

Aldehydes and ketones are reduced to hydrocarbons by zinc amalgam and cone.HCI. This is__________ reaction.

(a)

Clemmenson's reduction

(b)

Wolff krishner reduction

(c)

Rosenmmunds reduction

(d)

catalytic reduction

16.

Ozonolysis of terminal alkenes gives _________ as one of the products.

(a)

acetone

(b)

acetaldehyde

(c)

water

(d)

formaldehyde

17.

A device in which spontaneous chemical reaction generates electric current ________.

(a)

Galvanic cell

(b)

Voltaic cell

(c)

Daniel cell

(d)

All the above

18.

The pink colour of Schiff's reagent is restored by _______.

(a)

alcohol

(b)

acid

(c)

ketone

(d)

aldehyde

19.

Calcium acetate + calcium benzoate \(\overset { distillation }{ \longrightarrow } \) gives _______.

(a)

benzophenone

(b)

benzaldehyde

(c)

acetophenone

(d)

phenyl benzoate

20.

Which among the carbonyl compounds cannot be prepared by Rosenmund reduction?

(a)

Ketones

(b)

Formaldehyde

(c)

Acetaldehyde

(d)

Both (a) and (b)

21.

The property of the colloid which is independent on the charge of colloidal particle is______.

(a)

cataphoresis

(b)

electrophoresis

(c)

electro- osmosis

(d)

Tyndall effect

22.

1 - methoxy propane and 2 - methoxy propane are ________.

(a)

chain isomers

(b)

position isomers

(c)

metamers

(d)

functional isomers

23.

The compound that reacts faster with Lucas reagent is ________.

(a)

butan-l-ol

(b)

butan-2-ol

(c)

2-methyl propan-1-ol

(d)

2-methyl propan-2-ol

24.

Emulsion can be broken into constituent liquids by _______.

(a)

heating

(b)

freezing

(c)

centrifuging

(d)

all the above

25.

Which among the following reagent is not used to differentiate ethanol and phenol?

(a)

neutral FeCl₃

(b)

C₆H₅N₂CI

(c)

NaOH

(d)

anhy ZnCl₂

26.

Auto catalysis is observed in the reaction given below.
CH₃COOC₂H₅+H₂O➝ CH₃COOH+C₂H₅OH

(a)

CH₃COOC₂H₅

(b)

H₂O

(c)

CH₃COOH

(d)

C₂H₅OH

27.

In the graph showing Maxwell, Boltzmann distribution of energy _____.

(a)

area under the curve must not change with increase in temperature.

(b)

area under the curve increases in temperature.

(c)

area under the curve decreases with increase in temperature.

(d)

None of these above

28.

In pseudo-order reactions ______.

(a)

The actual order of reaction is different from that expected using rate law expression

(b)

The concentration of at least one reactant is taken in large excess.

(c)

The concentration of reactant taken in excess may be taken as constant

(d)

All of these

29.

Strong reducing behaviour of H₃PO₂ is due to______.

(a)

High oxidation state of phosphorus

(b)

High electro gain enthalpy of phosphorus

(c)

Presence of two-OH groups and one P-H bond

(d)

Presence of one-OH groups and two P-H bonds

30.

Least volatile hydrogen halide is ______.

(a)

(b)

HCI

(c)

HBr

(d)

31.

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

(a)

NF₃

(b)

PF₃

(c)

NI₃

(d)

Both (a) and (b)

32.

The number of chloride ions present per unit of CsCI are _______.

(a)

(b)

(c)

(d)

33.

Pick out the example for covalent and molecular crystal.

(a)

Ice, Diamond

(b)

Diamond, Ice

(c)

NaCl, FeS

(d)

FeS, Ice

34.

Which of the following statement is correct?

(a)

On increasing temperature, the coordination number of solid remains unchanged.

(b)

On increasing pressure, the co-ordination number of solid increases.

(c)

On increasing pressure, the co-ordination number of solid decreases.

(d)

On increasing temperature, the coordination number of solid increases

35.

Elements of group 13 mainly form covalent compounds because ______

(a)

small size

(b)

electro negativity values are high

(c)

ionization energy is very high

(d)

both (a) and (c)

36.

In which of the following arrangements, octahedral voids are formed?

(a)

fcc

(b)

bcc

(c)

simple cubic

(d)

hcp

37.

Graphite has _______.

(a)

2-d sheet structure

(b)

Vander waals force between successive layers of carbon sheets

(c)

Sp² hybridised carbon linked with other three carbon atoms in hexagonal planar structure

(d)

all the above

38.

________ has the highest electrical conductivity at room temperature.

(a)

Chromium

(b)

Copper

(c)

Silver

(d)

Cadmium

39.

Identify the correct reason for lanthanide contraction.

(a)

Decreasing nuclear charge

(b)

Decreasing screening effect

(c)

Increasing nuclear charge

(d)

Negligible screening effect

40.

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

(a)

Ce⁴⁺ and Yb²⁺acquire f⁷ configuration

(b)

Ce⁴⁺ and Yb²⁺acquire f⁰ configuration

(c)

Ce⁴⁺ and Yb²⁺acquire f⁷and f¹⁴ configuration

(d)

Ce⁴⁺and Yb²⁺acquire f⁰ and f¹⁴ configuration

41.

Most of the transition metal ions are coloured, because of the ________.

(a)

presence of unpaired electrons

(b)

energy gap between two energy levels is very small

(c)

both (a) and (b)

(d)

neither (a) nor (b)

42.

In the thermite process __________is used as a reducing agent

(a)

(b)

(c)

(d)

CO₂

43.

Magnesite is_______.

(a)

Magnesium oxide

(b)

Magnesium carbonate

(c)

Magnesium sulphate

(d)

Magnesium chloride

44.

Malachite has______ composition.

(a)

2CuCO₃.Cu(OH)₂

(b)

CuCO₃.Cu(OH)₂

(c)

Cu₂O

(d)

Cu₂S

45.

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

(a)

Non-wettability of the mineral particles in froth.

(b)

Non-wettability of the mineral particles in water

(c)

Non-wettability of the gangue particles in froth

(d)

Non-wettability of the gangue particles in water

46.

A Cobaltous complex [Co(H₂O)₆]³⁺absorbs orange light of 5900 \(\mathring { A } \). The colour of the complex is _______.

(a)

orange

(b)

yellow orange

(c)

blue

(d)

yellow

47.

The isomerism exhibited by the complexes [Co(NH₃)₆] [Cr(CN)₆] and [Cr(NH₃)₈] [CO(CN)₆] is_______.

(a)

Geometrical

(b)

Coordination

(c)

linkage

(d)

ionisation

48.

The name of [Pt^IV(NH₃)₂CI₂]²⁺is _______.

(a)

Diamminedichloroplatinum(IV) ion

(b)

Diamminedichloroplatinate (IV)

(c)

Diamminedichloroplatinum

(d)

Dichlorodiammineplatinum (IV) ion

49.

Among the following complexes the one which shows zero crystal field stabilisation energy is _______.

(a)

[Mn(H₂O)₆]³⁺

(b)

[Fe(H₂O)₆]³⁺

(c)

[CO(H₂O)₆]²⁺

(d)

[CO(H₂O)₆]³⁺

50.

Primary and secondary valencies of Cu in [Cu(NH₃)₄]SO₄ is _______.

(a)

4,4

(b)

2,4

(c)

4,1

(d)

4,2

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Answers Key:

Multiple Choice Question

50 x 1 = 50

(a)
nitromethane

(b)
1-nitro 2-methyl propane

(b)
Natural

(d)
Tetracyclines are antifertility drugs

(a)
amoxicillin

(d)
\(\mathrm{CH}_{3} \mathrm{NC} \stackrel{\mathrm{LiAlH}_{4}}{\longrightarrow}\)

(a)
saccharicacid

10.

(a)
vitamin B₆

11.

12.

(d)
both (a) and (b)

13.

(a)
two peptide units

14.

15.

(a)
Clemmenson's reduction

16.

(d)
formaldehyde

17.

(d)
All the above

18.

(d)
aldehyde

19.

20.

(d)
Both (a) and (b)

21.

(d)
Tyndall effect

22.

23.

(d)
2-methyl propan-2-ol

24.

(d)
all the above

25.

(d)
anhy ZnCl₂

26.

27.

(a)
area under the curve must not change with increase in temperature.

28.

(d)
All of these

29.

(d)
Presence of one-OH groups and two P-H bonds

30.

(a)
HF

31.

(d)
Both (a) and (b)

32.

33.

(b)
Diamond, Ice

34.

(b)
On increasing pressure, the co-ordination number of solid increases.

35.

(d)
both (a) and (c)

36.

(d)
hcp

37.

(d)
all the above

38.

39.

(d)
Negligible screening effect

40.

(d)
Ce⁴⁺and Yb²⁺acquire f⁰ and f¹⁴ configuration

41.

42.

(a)
AI

43.

(b)
Magnesium carbonate

44.

(b)
CuCO₃.Cu(OH)₂

45.

(b)
Non-wettability of the mineral particles in water

46.

47.

(b)
Coordination

48.

(a)
Diamminedichloroplatinum(IV) ion

49.

(b)
[Fe(H₂O)₆]³⁺

50.

(b)
2,4

12th Standard English Medium Chemistry Reduced Syllabus Creative One mark Question with Answer key - 2021(Public Exam )

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