12th Standard Chemistry English Medium Model 1 Mark Creative Questions (New Syllabus) 2020

Download Tamil Nadu 12th Standard Chemistry question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.

Questions:

Multiple Choice Question

47 x 1 = 47

The isomerism exhibited by 1-nitro butane and 1-nitro - 2- methyl propane is ______

(a)

chain

(b)

tautomerism

(c)

position

(d)

functional

CH₃NO₂+6[H] \(\underrightarrow { X? } \) CH₃NH₂+2H₂O. 'X' is

(a)

Sn/HCI

(b)

Zn/NH₄CI

(c)

Glucose + NaOH

(d)

Na₃A₅O₃/NaOH

The organic compound that undergoes carbylamine reaction is

(a)

(C₂H₅)₂NH

(b)

C₂H₅NH₂

(c)

(C₂H₅)₃ N

(d)

(C₂H₅)₄N⁺L^-

The formulation of dettol contains ______________.

(a)

chloroxylenol

(b)

terpineol

(c)

alcohol

(d)

all of these

Which among the following exists as zwitter ion?

(a)

sulphanilic acid

(b)

salicylic acid

(c)

acetanilide

(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 ultimate product of hydrolysis of starch in the presence of dilute acid is

(a)

dextrin

(b)

maltose

(c)

maltase

(d)

glucose

Glucose is not oxidised to gluconic acid by

(a)

Br₂/H₂O

(b)

Fehling's solution

(c)

Tollen's reagent

(d)

Conc.HNO₃

Low molar conductivity at high concentration is due to _______.

(a)

High attractive force between oppositely charged ions

(b)

Viscous drag due to greater solvation

(c)

Both High attractive force between oppositely charged ions and Viscous drag due to greater solvation

(d)

Neither High attractive force between oppositely charged ions and Viscous drag due to greater solvation

10.

The most acidic among the following is ________.

(a)

p- nitrophenol

(b)

p- hydroxybenzoicacid

(c)

o- hydroxy benzoic acid

(d)

p- toluic acid

11.

The metals near the bottom of the electro chemical series are ______.

(a)

strong reducing agents

(b)

strong oxidising agents

(c)

weak reducing agents

(d)

weak oxidising agents

12.

An example of pinacol is _______.

(a)

CH3-CH₂OH

(b)

\(\underset { \overset { | }{ \underset { \overset { | }{ { CH }_{ 2 }-OH } }{ CH-OH } } }{ { CH }_{ 2 }-OH } \)

(c)

\({ CH }_{ 3 }-\overset { \underset { | }{ { CH }_{ 3 } } }{ \underset { \overset { | }{ OH } }{ C } } -\overset { \underset { | }{ { CH }_{ 3 } } }{ \underset { \overset { | }{ OH } }{ C } } -{ CH }_{ 3 }\)

(d)

both (b) and (c)

13.

The laws of electrolysis were enunciated first by

(a)

Dalton

(b)

Faraday

(c)

Kekule

(d)

Avogadro

14.

Kohlrausch's law is applied to calculate ________.

(a)

molar conductance at infinite dilution of a weak electrolyte

(b)

degree of dissociation of weak electrolyte

(c)

solubility of a sparingly soluble salt

(d)

all the above

15.

4 - methyl pent - 3 ene - 2 - one is the IUPAC name of _______.

(a)

mesitylene

(b)

mesityl oxide

(c)

phorone

(d)

chloretone

16.

Hydrogenation of benzoyl chloride in the presence of Pd on BaSO₄ gives _______.

(a)

phenol

(b)

benzoic acid

(c)

benzyl alcohol

(d)

benzaldehyde

17.

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

(a)

Ketones

(b)

Formaldehyde

(c)

Acetaldehyde

(d)

Both (a) and (b)

18.

Which one of the following is correct?

(a)

pH = H⁺

(b)

pH = -log₁₀H⁺

(c)

pH = log₁₀H⁺

(d)

pH = 2log₁₀H⁺

19.

Intermolecular hydrogen bonds are not _______ present in.

(a)

CH₃COOH

(b)

C₂H₅OC₂H₅

(c)

CH₃CH₂OH

(d)

C₂H₅NH₂

20.

The test used to distinguish wish 1^o, 2^o and 3^o alcohol is ________.

(a)

Lucas test

(b)

Victor Meyer's

(c)

dehydrogenation

(d)

all the above

21.

Isomerism exhibited by ethylene glycol is ________.

(a)

position isomerism

(b)

chain isomerism

(c)

functional isomerism

(d)

both (a) and (c)

22.

The number of secondary alcoholic group in glycerol is _______.

(a)

(b)

(c)

(d)

23.

Analyses the equilibrium
HClO₄ +H₂O ⇌ H₃O+ \({ ClO }_{ 4 }^{ - }\)
and choose the correct statement.

(a)

H₃O⁺ is the conjugate base of H₂O

(b)

CIO₄^- is the conjugate base of HCIO₄

(c)

H₂O is the conjugate acid of H₃O⁺

(d)

HCIO₄ is the conjugate acid of H₃O⁺

24.

Baeyer's reagent is _______.

(a)

ZnlHg in Cone HCI

(b)

acidified K₂Cr₂O₇

(c)

cold alkaline KMnO₄

(d)

Sodium borohydride

25.

Which among the following has both local anaesthetic and antiseptic properties?

(a)

benzyl benzoate

(b)

phenol

(c)

benzyl alcohol

(d)

n-propyl alcohol

26.

For W/O emulsion, the principle emulsifying agent is _______.

(a)

proteins

(b)

synthetic soaps

(c)

lampblack

(d)

gums

27.

The reaction of Lucas reagent is fast with ______.

(a)

(CH₃)₃ COH

(b)

(CH₃)₂ CHOH

(c)

CH₃(CH₂)₂OH

(d)

CH₃CH₂OH

28.

Which one is the correct factor that explains the increase of rate of reaction by a catalyst?

(a)

Shape selectivity

(b)

Particle size

(c)

Increase of free energy

(d)

Lowering of activation energy

29.

Which one of the alcohol cannot be prepared by grignard reagent?

(a)

Methanol

(b)

ethanol

(c)

iso propyl alcohol

(d)

phenyl methanol

30.

Which of the following is true regarding Freundlich adsorption isotherm equation?

(a)

Purely empirical

(b)

Valid only over a limited pressure range

(c)

The value of constants k and n varies with temperature

(d)

All the above

31.

When the E_a of a reaction zero then the rate constant of the reaction is equal to _______.

(a)

2.303 K

(b)

\(\frac { K }{ 2.303 } \)

(c)

\(\left( { t }_{ \frac { 1 }{ 2 } } \right) \)

(d)

32.

Which of the following statement is not correct?

(a)

Molecularity of a reaction cannot be fractional

(b)

Molecularity of a reaction cannot be more than three

(c)

Molecularity of a reaction can be zero

(d)

Molecularity is assigned for each elementary step of mechanism.

33.

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 ______.

(a)

(b)

(c)

III

(d)

Zero

34.

The coordination number of ZnS is _______.

(a)

(b)

(c)

(d)

35.

The number of octahedral void(s) per atom present in a cubic close-packed structure is_________.

(a)

(b)

(c)

(d)

36.

Crystalline solids are also called as _______.

(a)

supercooled liquids

(b)

true solids

(c)

pseudo solids

(d)

all the above

37.

Which of the following is incorrect statement about the Bragg's equation nλ = 2d sin θ?

(a)

n, represents order of reflection

(b)

λ, represents wave length of uv-rays used

(c)

θ, represents angle of incidence

(d)

d, represents distance between two parallel planes

38.

Identify the electron - deficient species

(a)

(BH₃)₂

(b)

(SiH₃)₂

(c)

PH₃

(d)

(CH₃)₂

39.

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

(a)

fcc

(b)

bcc

(c)

simple cubic

(d)

hcp

40.

Chemical formula of phosgene is_______.

(a)

COCl₂

(b)

CaOCl₂

(c)

CaCO₃

(d)

COCI

41.

Which one of the following exhibits highest oxidation state?

(a)

(b)

(c)

(d)

42.

Hybridisation of chromium ions and dichromate ions is ________.

(a)

Sp²

(b)

Sp³d

(c)

both (a) and (b)

(d)

None of these

43.

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

(a)

Phosphorus

(b)

Manganese

(c)

Carbon

(d)

Silicon

44.

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

(a)

Zone of combustion : \(C+{ O }_{ 2 }\rightarrow { CO }_{ 2 }\)

(b)

Zone of heat absorption : \({ CO }_{ 2 }\rightarrow C+{ O }_{ 2 }\)

(c)

Zone of slag formation : \(CaO+{ SiO }_{ 2 }\rightarrow CaSiO_{ 3 }\)

(d)

Zone of reduction : \({ Fe }_{ 2 }{ O }_{ 3 }3C\rightarrow 3CO+2Fe\)

45.

In an octahedral complex, the (n-1) d orbital are involved in hybridization. The complex is called ________ complex.

(a)

inner orbital

(b)

low spin

(c)

spin paired

(d)

all the above

46.

Naming the ligand in [M(en)₂]ⁿ⁺starts with _______.

(a)

(b)

(c)

Bis

(d)

any of these

47.

An aqueous solution of (PdCI)₂ 4NH_3,when treated with excess of AgNO₃precipitated 2 moles of AgCI. Predict the secondary valency of the compound _______.

(a)

(b)

(c)

(d)

Visit QB365-SLMS - https://www.qb365.in/slms/

Answers Key:

Multiple Choice Question

47 x 1 = 47

(b)
tautomerism

(a)
Sn/HCI

(b)
C₂H₅NH₂

(d)
all of these

(a)
sulphanilic acid

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

(d)
glucose

(d)
Conc.HNO₃

10.

11.

(a)
strong reducing agents

12.

(c)
\({ CH }_{ 3 }-\overset { \underset { | }{ { CH }_{ 3 } } }{ \underset { \overset { | }{ OH } }{ C } } -\overset { \underset { | }{ { CH }_{ 3 } } }{ \underset { \overset { | }{ OH } }{ C } } -{ CH }_{ 3 }\)

13.