CBSE 12 Chemistry Question Paper-2020 Set-4 by Pavan | Practice Test to Test Your Knowledge
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  3. CBSE 12 Chemistry Question Paper-2020 Set-4
CBSE 12 Chemistry Question Paper-2020 Set-4

CBSE 12 Chemistry Question Paper-2020 Set-4

This mock test includes actual CBSE Class 12 Chemistry board exam questions from the year 2020 set-4, helping students understand exam trends and practice real paper format

2025-08-07
Pavan Pavan
CBSE Class 12 Chemistry 2020 Grade 12

Duration

30 min

Questions

30

Marking

Negative

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Questions Preview

What is the principle of vapour phase refining?

A
Sublimation
B
Reduction
C
Distillation
D
Oxidation

Which of the following is a chiral compound?

A
CH3CH2OH
B
CH3Cl
C
CH3CH3
D
CH3OH

The coordination number of β€˜Co’ in the complex [Co(en)3]3+ is:

A
3
B
6
C
4
D
5

What is the major product of the following reaction?
C6H5CH2OH + O2 ->

A
Benzyl alcohol
B
Benzene
C
Benzoic acid
D
Toluene

Which of the following compounds is a narcotic analgesic?

A
Penicillin
B
Codeine
C
Ranitidine
D
Morphine

Which of the following is a method for refining Zinc?

A
Electrolytic refining
B
Zone refining
C
Vapour phase refining
D
Thermal refining

Out of CH3CH2Cl and CH2=CH–CH2–Cl, which one is more reactive towards SN1 reaction?

A
CH3CH2Cl
B
CH2=CH–CH2–Cl
C
Both react equally
D
Neither reacts

Which is an isomer of C3H9N that does not react with Hinsberg reagent?

A
CH3NH2
B
CH3CH2NH2
C
CH3(CH2)2NH2
D
C3H9N

What type of protein is present in keratin?

A
Globular protein
B
Fibrous protein
C
Enzyme
D
Hormone

Which compound is added to soap to provide antiseptic properties?

A
Iodine
B
Chlorine
C
Carbolic acid
D
Sulphur

Which of the following is the most stable complex?

A
[Fe(CO)5]
B
[Fe(H2O)6]3+
C
[Fe(C2O4)3]3-
D
[Fe(CN)6]3-

Which of the following is correct for the spontaneity of a cell?

A
Ξ”G = –ve, Eo = +ve
B
Ξ”G = +ve, Eo = 0
C
Ξ”G = –ve, Eo = 0
D
Ξ”G = +ve, Eo = –ve

For a zero-order reaction, the slope in the plot of [R] Vs. time is:

A
2.303/k
B
-k
C
2.303/k + [R]0
D
+k

What type of isomerism is shown by the pair [Cr(H2O)6]Cl3 and [Cr(H2O)5Cl]Cl2 Β· H2O?

A
Ionization isomerism
B
Coordination isomerism
C
Solvate isomerism
D
Linkage isomerism

Which one is the complementary base of cytosine in one strand to that in the other strand of DNA?

A
Adenine
B
Guanine
C
Thymine
D
Uracil

Which of the following is a positive catalyst?

A
Platinum
B
Iron
C
Oxygen
D
Magnesium

What is the product formed when FeSO4 is heated?

A
Fe2O3
B
FeO
C
Fe3O4
D
Fe

Which of the following is the strongest acid?

A
Hydrochloric acid
B
Sulfuric acid
C
Nitric acid
D
Phosphoric acid

Which of the following is a characteristic of a strong acid?

A
Low pH
B
High pH
C
Neutral pH
D
No reactivity

Which element is most commonly used in batteries?

A
Lithium
B
Copper
C
Iron
D
Zinc

Which gas is released during the reaction of an acid with a metal?

A
Oxygen
B
Hydrogen
C
Nitrogen
D
Carbon dioxide

Which of the following is an example of a polymer?

A
Polyethylene
B
Propylene
C
Butylene
D
Methane

What type of bond is present in a water molecule?

A
Ionic bond
B
Covalent bond
C
Metallic bond
D
Hydrogen bond

Which of the following is an example of a base?

A
NaOH
B
HCl
C
H2SO4
D
CO2

What is the process called when a solid is dissolved in a liquid?

A
Crystallization
B
Evaporation
C
Dissolution
D
Sublimation

What is the name of the gas formed when vinegar reacts with baking soda?

A
Oxygen
B
Carbon dioxide
C
Nitrogen
D
Methane

Which of the following is a property of metals?

A
Brittle
B
Good conductor of heat and electricity
C
Non-lustrous
D
Poor conductor of electricity

Which acid is present in vinegar?

A
Acetic acid
B
Citric acid
C
Sulfuric acid
D
Hydrochloric acid

Which of the following is a characteristic of acids?

A
Bitter taste
B
Sour taste
C
Slippery feel
D
No effect on litmus paper

What is the formula of ammonia?

A
NH4
B
NH3
C
N2H4
D
N2H3