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

CBSE 12 Chemistry Question Paper-2020 Set-3

This mock test includes actual CBSE Class 12 Chemistry board exam questions from the year 2020 set-3, 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

Why are Zn, Cd, and Hg non-transition elements?

A
They have completely filled d-orbitals
B
They have a stable electronic configuration
C
They do not form colored ions
D
They exhibit only one oxidation state

Which transition metal of the 3d series does not show variable oxidation states?

A
Ti
B
Fe
C
Zn
D
Mn

Why do transition metals and their compounds show catalytic activity?

A
Due to their ability to form complex ions
B
They have high melting points
C
They exhibit a wide range of oxidation states
D
They have completely filled d-orbitals

Why are melting points of transition metals high?

A
Because of strong metallic bonding
B
Because of weak Van der Waals forces
C
Due to the presence of d-electrons
D
Because of their non-metallic nature

Why is Cu2+ ion coloured while Zn2+ ion is colourless in aqueous solution?

A
Cu2+ has partially filled d-orbitals
B
Zn2+ does not have any d-electrons
C
Cu2+ has a high oxidation state
D
Zn2+ does not form complexes

What is the IUPAC name of the complex [CoF6]3-?

A
Cobalt(III) hexafluoride
B
Cobalt(II) hexafluoride
C
Cobalt(III) fluoride
D
Cobalt hexafluoride

What type of isomerism is shown by the complex [Co(en)2Cl2]2+?

A
Geometrical isomerism
B
Optical isomerism
C
Linkage isomerism
D
Ionization isomerism

Which of the following reactions gives blister copper?

A
Cu2+ + Zn → Zn2+ + Cu
B
Cu2S + FeS → 2 Cu + FeS2
C
Cu2S + 2 Cu2O → 6 Cu + SO2
D
Cu2O + C → 2 Cu + CO

What is the unit of rate constant for a first-order reaction?

A
mol/L·s
B
L/mol·s
C
1/s
D
mol/s

Which of the following substances is used in sleeping pills?

A
Aspirin
B
Diazepam
C
Ibuprofen
D
Paracetamol

Which of the following solutions of KCl will have the highest value of specific conductance?

A
0.5 M
B
0.01 M
C
0.1 M
D
1.0 M

Which of the following reactions is responsible for the formation of benzene from methyl chloride?

A
CH3Cl + AlCl3 → C6H6
B
CH3Cl + H2 → C6H6
C
C6H6 + Cl2 → CH3Cl
D
C6H6 + CH3Cl → C6H5CH3

The rate law of a reaction is given by: rate = k[A][B]. What is the order of the reaction?

A
1
B
2
C
3
D
0

What type of bond is present in NaCl?

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

Which of the following is the correct formula for the dissociation of sodium chloride in water?

A
NaCl → Na+ + Cl-
B
NaCl → Na2+ + Cl2-
C
NaCl → Na2Cl
D
NaCl → Na + Cl

Which of the following statements is true regarding a catalyst?

A
It increases the activation energy
B
It decreases the activation energy
C
It is consumed during the reaction
D
It is unchanged after the reaction

What is the molecular weight of a compound if 1 mole of it contains 6.022 x 10^23 molecules?

A
32 g/mol
B
16 g/mol
C
44 g/mol
D
18 g/mol

Which of the following is not a type of chemical bond?

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

What is the primary characteristic of a Lewis acid?

A
It can donate an electron pair
B
It can accept an electron pair
C
It can form hydrogen bonds
D
It can form covalent bonds

Which of the following is the correct electronic configuration of an oxygen atom?

A
1s2 2s2 2p4
B
1s2 2s2 2p6
C
1s2 2s2 2p3
D
1s2 2s1 2p5

Which of the following elements is a noble gas?

A
Sodium
B
Neon
C
Oxygen
D
Chlorine

Which of the following compounds is an example of a Lewis base?

A
Water
B
Ammonia
C
Carbon dioxide
D
Boron trifluoride

Which of the following reactions is an example of an oxidation reaction?

A
Cu2S + FeS → 2 Cu + FeS2
B
Fe2+ → Fe3+
C
Na + Cl2 → NaCl
D
Cu2+ → Cu+

What is the main characteristic of ionic compounds?

A
They are poor conductors of electricity
B
They are gases at room temperature
C
They have high melting points
D
They are good conductors in the solid state

Which of the following metals is extracted using electrolysis?

A
Copper
B
Iron
C
Aluminum
D
Gold

What is the name of the process in which a solid is separated from a liquid by filtration?

A
Filtration
B
Crystallization
C
Distillation
D
Evaporation

Which of the following is a physical change?

A
Rusting of iron
B
Digestion of food
C
Melting of ice
D
Burning of wood

What is the chemical formula for methane?

A
C2H6
B
CH4
C
C3H8
D
C4H10

Which of the following is a covalent bond?

A
NaCl
B
H2O
C
NaOH
D
KCl

What is the oxidation number of chlorine in NaClO3?

A
+5
B
-1
C
+3
D
+1