CBSE 12 Chemistry Question Paper-2020 Set-1 by Pavan | Practice Test to Test Your Knowledge
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  3. CBSE 12 Chemistry Question Paper-2020 Set-1
CBSE 12 Chemistry Question Paper-2020 Set-1

CBSE 12 Chemistry Question Paper-2020 Set-1

This mock test includes actual CBSE Class 12 Chemistry board exam questions from the year 2020 Set-1, 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 substitution reaction of alkyl halides?

A
Reactions occur via electrophilic addition
B
Reactions occur via SN1 or SN2 mechanism
C
Reactions occur via nucleophilic addition
D
Reactions occur via elimination mechanism

What is the factor that controls the rate of SN1 reactions?

A
Nucleophile strength
B
Stability of the carbocation
C
Polarity of the solvent
D
Steric factor

What is the role of steric factor in SN2 reactions?

A
It stabilizes the carbocation
B
It governs the rate of reaction
C
It determines the mechanism
D
It accelerates the elimination step

What happens when ethers are cleaved with HI?

A
It produces alkyl halides
B
It results in the formation of alcohols
C
It depends on the steric factor and carbocation stability
D
It leads to the formation of alkynes

Which of the following is a major factor in substitution reactions of alkyl halides?

A
Strength of the nucleophile
B
Polarity of the carbon-halogen bond
C
Presence of a halogen in the molecule
D
Temperature of the reaction

What is the stereochemistry of the product if an optically active alkyl halide undergoes substitution by the SN2 mechanism?

A
The product will remain unchanged
B
The product will be racemic
C
The product will be inverted
D
The product will have no optical activity

What happens when anisole is treated with HI?

A
The product will be methyl iodide
B
The product will be phenol
C
The product will be iodine
D
The product will be methyl alcohol

What is the major product formed when 2-Bromobutane undergoes a reaction with alcoholic KOH?

A
3-butene
B
2-butene
C
Butane
D
1-butene

What is the instrument used to measure the angle of plane-polarized light rotation?

A
Refractometer
B
Spectrophotometer
C
Polarimeter
D
Thermometer

What is one use of CHI3 (Iodoform)?

A
It is used as a disinfectant
B
It is used in the preparation of perfumes
C
It is used as a solvent
D
It is used as an antiseptic

Which liquid will have higher vapor pressure at 90°C if the boiling points of liquids A and B are 140°C and 180°C respectively?

A
Liquid B
B
Liquid A
C
Neither will have vapor pressure at this temperature
D
Both A and B will have the same vapor pressure

Which structural unit in a detergent makes it non-biodegradable?

A
Carboxyl group
B
Aromatic group
C
Long carbon chain
D
Alcohol group

What is the monomer structure of Teflon?

A
Polypropylene
B
Polystyrene
C
Polyethylene
D
Tetrafluoroethylene

Out of zinc and tin, which coating is better to protect iron objects?

A
Both have the same protective properties
B
Zinc
C
Neither of them protects
D
Tin

Will the rate constant of the reaction depend upon T if the activation energy (Eact) of the reaction is zero?

A
No, the rate constant will be independent of temperature
B
Yes, the rate constant will depend on temperature
C
The rate constant will be zero
D
The rate constant will be infinite

What is the stereochemistry of the product if an optically active alkyl halide undergoes substitution by the SN1 mechanism?

A
The product will be inverted
B
The product will be racemic
C
The product will remain unchanged
D
The product will have no optical activity

What is the major product formed when anisole is treated with HI?

A
The product will be iodine
B
The product will be phenol
C
The product will be methyl iodide
D
The product will be methyl alcohol

What is the major product formed when 2-Bromobutane reacts with alcoholic KOH?

A
Butane
B
Butene
C
Pentane
D
2-Butene

What is the correct IUPAC name of the compound shown?

A
2,2-Dimethylbutanoic acid
B
2-Carboxyl-2-methylbutane
C
2-Ethyl-2-methylpropanoic acid
D
3-Methylbutane carboxylic acid

What is the correct oxidation state for the transition element with Z = 25?

A
+2
B
+3
C
+4
D
+5

What happens during the hardening of leather in the tanning industry?

A
Electrophoresis
B
Electro-osmosis
C
Mutual coagulation
D
Tyndall effect

Which of the following gives the iodoform test?

A
Pentan-3-one
B
Hexan-2-one
C
Methoxymethane
D
Ethanol

What is the molecularity of the reaction H2 + Br2 → 2HBr?

A
3
B
1
C
2
D
4

What is the correct IUPAC name of the given compound (if applicable)?

A
2,2-Dimethylbutanoic acid
B
3-Methylbutane carboxylic acid
C
2-Ethyl-2-methylpropanoic acid
D
2-Carboxyl-2-methylbutane

Which transition element shows the maximum number of oxidation states?

A
Fe (Z = 26)
B
Mn (Z = 25)
C
Cr (Z = 24)
D
Sc (Z = 21)

What is the formula for the reaction H2 + Br2 → 2HBr?

A
H2 + Br2 → 2HBr
B
2H2 + Br2 → 2HBr
C
H2 + 2Br2 → 2HBr
D
H2 + Br2 → H2Br

Which element is the hardest to extract from its ore?

A
Gold
B
Copper
C
Iron
D
Silver

What is the molecular formula of water?

A
H2O
B
H2O2
C
HO2
D
H3O

Which of the following is not a product of photosynthesis?

A
Oxygen
B
Glucose
C
Water
D
Carbon dioxide

What is the name of the bond formed between two amino acids?

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