CBSE 12 Chemistry Question Paper-2020 Set-5 by Pavan | Practice Test to Test Your Knowledge
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CBSE 12 Chemistry Question Paper-2020 Set-5

CBSE 12 Chemistry Question Paper-2020 Set-5

This mock test includes actual CBSE Class 12 Chemistry board exam questions from the year 2020 set-5, 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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Why halogens have maximum negative electron gain enthalpy?

A
They are highly electronegative
B
They have small atomic radii
C
They have low ionization energies
D
They are stable in their elemental form

Why fluorine shows anomalous behaviour as compared to other halogens?

A
It has high bond dissociation enthalpy
B
It is highly electronegative
C
It has high electron gain enthalpy
D
Its atomic size is small

Arrange the hydrogen halides (HF to HI) in the decreasing order of their reducing character.

A
HF > HCl > HBr > HI
B
HI > HBr > HCl > HF
C
HCl > HF > HBr > HI
D
HCl > HI > HBr > HF

Why fluorine is a stronger oxidizing agent than chlorine?

A
It has higher electronegativity
B
It has a lower bond dissociation enthalpy
C
It has a larger atomic radius
D
It has a higher ionization energy

What are the sizes of X and X' in the interhalogen compounds?

A
X is larger than X'
B
X is smaller than X'
C
X and X' have the same size
D
X' is larger than X

A hydrocarbon C5H12 gives only one monochloride on photochemical chlorination. Identify the compound.

A
Pentane
B
2-Methylbutane
C
3-Methylbutane
D
Isopentane

Out of (CH3)3N and (CH3)2NH, which one is more basic in aqueous solution?

A
(CH3)3N
B
(CH3)2NH
C
Both are equally basic
D
Neither are basic

Out of Cis – [Pt(en)2Cl2]2+ and Trans – [Pt(en)2Cl2]2+, which one is optically active?

A
Cis – [Pt(en)2Cl2]2+
B
Trans – [Pt(en)2Cl2]2+
C
Both are optically active
D
Neither is optically active

Name the method of refining used to obtain semiconductor of very high purity.

A
Distillation
B
Electrolytic refining
C
Zone refining
D
Fractional crystallization

Is Nylon a homopolymer or copolymer?

A
Homopolymer
B
Copolymer
C
Both
D
Neither

ZnSO4 gives one monochloride on photochemical chlorination. Identify the compound.

A
Zn
B
Fe
C
Cu
D
Sn

Which of the following is the correct standard electrode potential for Zn2+/Zn and Fe2+/Fe?

A
E°Zn2+/Zn = E°Fe2+/Fe
B
E°Zn2+/Zn < E°Fe2+/Fe
C
E°Zn2+/Zn > E°Fe2+/Fe
D
E°Zn2+/Zn = 0

Which of the following compounds are used for refining?

A
Cu2S, CuO
B
Cu2S, FeO
C
Cu2S, FeS
D
Cu2S, ZnO

Which of the following is an artificial sweetener used only in cold drinks?

A
Aspartame
B
Saccharin
C
Stevia
D
Sucralose

What polymer is used to make non-stick utensils?

A
Polypropylene
B
PTFE
C
PVC
D
Polyethylene

Which compound exhibits both acidic and basic properties?

A
Water
B
Ammonia
C
Acetic acid
D
Sodium hydroxide

Which of the following is the IUPAC name for the compound CH3-CH2-COOH?

A
Acetic acid
B
Propanoic acid
C
Butanoic acid
D
Ethanol

What is the general formula of alkanes?

A
C_nH_2n+2
B
C_nH_2n
C
C_nH_2n-2
D
C_nH_2n+1

Which of the following compounds is an example of an alkene?

A
C2H4
B
C3H8
C
C4H10
D
C5H12

Which of the following is an isomer of butane?

A
Propane
B
Methane
C
Isobutane
D
Ethane

What is the molecular formula of methane?

A
CH4
B
C2H6
C
C3H8
D
C4H10

Which of the following is a product of the combustion of hydrocarbons?

A
Carbon dioxide and water
B
Oxygen and hydrogen
C
Methane and oxygen
D
Nitrogen and oxygen

Which of the following is the strongest acid?

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

Which gas is commonly used in the process of hydrogenation of vegetable oils?

A
Oxygen
B
Hydrogen
C
Nitrogen
D
Carbon dioxide

What is the name of the process used to separate different components of a liquid mixture based on boiling points?

A
Distillation
B
Filtration
C
Chromatography
D
Evaporation

Which of the following is the smallest unit of an element?

A
Atom
B
Molecule
C
Electron
D
Ion

What is the name of the law that states that the pressure of a gas is directly proportional to its temperature?

A
Boyle's Law
B
Charles's Law
C
Avogadro's Law
D
Dalton's Law

Which of the following elements is a noble gas?

A
Oxygen
B
Nitrogen
C
Argon
D
Hydrogen

Which of the following compounds is commonly used as an antiseptic?

A
Ethanol
B
Acetone
C
Iodine
D
Chloroform

Which of the following gases is responsible for the greenhouse effect?

A
Oxygen
B
Carbon dioxide
C
Nitrogen
D
Methane