I’ll provide more multiple-choice questions (MCQs) with answers for CBSE Class 12 Chemistry. These are categorized chapter-wise based on the latest syllabus.
Chapter 1: Solid State
1. The number of atoms per unit cell in a face-centered cubic (FCC) crystal is:
a) 2
b) 4
c) 6
d) 8
Ans: b) 4
2. The type of defect in which an atom is missing from its lattice position is called:
a) Interstitial defect
b) Vacancy defect
c) Frenkel defect
d) Schottky defect
Ans: b) Vacancy defect
3. Graphite is a good conductor of electricity due to the presence of:
a) Covalent bonds
b) Free electrons
c) Lone pairs
d) Ionic bonds
Ans: b) Free electrons
Chapter 2: Solutions
4. The molality of a solution is defined as:
a) Moles of solute per liter of solution
b) Moles of solute per kg of solvent
c) Grams of solute per liter of solvent
d) Moles of solute per gram of solvent
Ans: b) Moles of solute per kg of solvent
5. The van’t Hoff factor for K₄[Fe(CN)₆] in aqueous solution is:
a) 2
b) 3
c) 4
d) 5
Ans: d) 5
Chapter 3: Electrochemistry
6. The standard electrode potential of a metal electrode is measured against:
a) Calomel electrode
b) Hydrogen electrode
c) Copper electrode
d) Silver electrode
Ans: b) Hydrogen electrode
7. In an electrolytic cell, the cathode is:
a) Positively charged
b) Negatively charged
c) Neutral
d) None of these
Ans: b) Negatively charged
Chapter 4: Chemical Kinetics
8. The unit of rate constant for a first-order reaction is:
a) L mol⁻¹ s⁻¹
b) s⁻¹
c) mol L⁻¹ s⁻¹
d) L² mol⁻² s⁻¹
Ans: b) s⁻¹
9. The half-life of a first-order reaction is:
a) Directly proportional to the initial concentration
b) Independent of the initial concentration
c) Inversely proportional to the initial concentration
d) Dependent on the reaction mechanism
Ans: b) Independent of the initial concentration
Chapter 5: Surface Chemistry
10. Which catalyst is used in the Haber process for ammonia synthesis?
a) Nickel
b) Platinum
c) Iron
d) Vanadium pentoxide
Ans: c) Iron
11. The type of adsorption where adsorbate is held by weak van der Waals forces is:
a) Physisorption
b) Chemisorption
c) Irreversible adsorption
d) Activated adsorption
Ans: a) Physisorption
Chapter 6: General Principles and Processes of Isolation of Elements
12. The method used to extract low-reactivity metals from their ores is:
a) Roasting
b) Smelting
c) Electrolysis
d) Distillation
Ans: b) Smelting
Chapter 7: The p-Block Elements
13. The structure of ozone is:
a) Linear
b) Bent
c) Tetrahedral
d) Trigonal planar
Ans: b) Bent
14. Which of the following does not form a pentahalide?
a) Nitrogen
b) Phosphorus
c) Arsenic
d) Antimony
Ans: a) Nitrogen
Chapter 8: The d- and f-Block Elements
15. The color of Cu²⁺ ion in aqueous solution is:
a) Green
b) Blue
c) Yellow
d) Pink
Ans: b) Blue
16. The transition metal that does not exhibit variable oxidation states is:
a) Scandium
b) Iron
c) Copper
d) Chromium
Ans: a) Scandium
Chapter 9: Coordination Compounds
17. The oxidation state of Ni in [Ni(CO)₄] is:
a) +2
b) +4
c) 0
d) +3
Ans: c) 0
18. The ligand that can form chelates is:
a) NH₃
b) H₂O
c) EDTA
d) Cl⁻
Ans: c) EDTA
Chapter 10: Haloalkanes and Haloarenes
19. The IUPAC name of CH₃CH(Br)CH₃ is:
a) 1-Bromopropane
b) 2-Bromopropane
c) Bromopropane
d) 3-Bromopropane
Ans: b) 2-Bromopropane
Chapter 11: Alcohols, Phenols, and Ethers
20. The functional group in ether is:
a) –OH
b) –COO–
c) –O–
d) –COOH
Ans: c) –O–
Chapter 12: Aldehydes, Ketones and Carboxylic Acids
21. Which test is used to distinguish aldehydes from ketones?
a) Lucas test
b) Fehling’s test
c) Benedict’s test
d) Tollen’s test
Ans: d) Tollen’s test
Chapter 13: Organic Compounds Containing Nitrogen
22. The reaction of an amide with Br₂ and NaOH gives:
a) Amine
b) Ketone
c) Alcohol
d) Aldehyde
Ans: a) Amine
Chapter 14: Biomolecules
23. The primary structure of DNA is stabilized by:
a) Peptide bonds
b) Phosphodiester bonds
c) Hydrogen bonds
d) Ionic bonds
Ans: b) Phosphodiester bonds
Chapter 15: Polymers
24. Which polymer is used for making unbreakable bottles?
a) Polyethylene
b) Polyvinyl chloride
c) Polystyrene
d) Polycarbonate
Ans: d) Polycarbonate
Chapter 16: Chemistry in Everyday Life
25. Which of the following is an antacid?
a) Aspirin
b) Ranitidine
c) Paracetamol
d) Ampicillin
Ans: b) Ranitidine
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