๐ฌ Chemistry Most Important MCQs (Complete Book Based)
(50 MCQs with Answers – Exam Oriented)
1. Which sugar is present in milk?
A. Glucose
B. Sucrose
C. Maltose
D. Lactose
✅ Answer: D. Lactose
2. Which sugar is known as cane sugar?
A. Glucose
B. Fructose
C. Sucrose
D. Lactose
✅ Answer: C. Sucrose
3. The sweetest sugar among the following is:
A. Glucose
B. Maltose
C. Fructose
D. Sucrose
✅ Answer: C. Fructose
4. Which sugar is called grape sugar?
A. Fructose
B. Glucose
C. Maltose
D. Lactose
✅ Answer: B. Glucose
5. Which nitrogenous base is present in RNA instead of thymine?
A. Adenine
B. Guanine
C. Cytosine
D. Uracil
✅ Answer: D. Uracil
6. Nitrogenous bases present in RNA are:
A. A, G, C, T
B. A, G, C, U
C. A, T, C, U
D. G, C, T, U
✅ Answer: B. A, G, C, U
7. Reaction of R–NH₂ with CHCl₃ and KOH is called:
A. Gattermann reaction
B. Carbylamine reaction
C. Cannizzaro reaction
D. Wurtz reaction
✅ Answer: B. Carbylamine reaction
8. Cannizzaro reaction of formaldehyde gives:
A. Methane
B. Methanol
C. Ethanol
D. Methylamine
✅ Answer: B. Methanol
9. Formalin is an aqueous solution of:
A. Formic acid
B. Acetaldehyde
C. Formaldehyde
D. Acetic acid
✅ Answer: C. Formaldehyde
10. Ethers are generally:
A. Acidic
B. Basic
C. Neutral
D. Amphoteric
✅ Answer: B. Basic
11. Lucas reagent is used to identify:
A. Alkenes
B. Alkyl amines
C. Alcohols
D. Nitro compounds
✅ Answer: C. Alcohols
12. Rosenmund reduction gives:
A. Alcohol
B. Ketone
C. Aldehyde
D. Acid
✅ Answer: C. Aldehyde
13. Alkyl halides have general formula:
A. CโH₂โ
B. CโH₂โ₊₂
C. CโH₂โ₊₁X
D. CโH₂โ₋₁X
✅ Answer: C. CโH₂โ₊₁X
14. Oxidation state of Mn in KMnO₄ is:
A. +2
B. +4
C. +6
D. +7
✅ Answer: D. +7
15. Oxidation state of Co in [Co(NH₃)₅Cl]Cl₂ is:
A. +1
B. +2
C. +3
D. +4
✅ Answer: C. +3
16. Iron (Fe) belongs to:
A. s-block
B. p-block
C. d-block
D. f-block
✅ Answer: C. d-block
17. Unit of rate constant for zero-order reaction is:
A. s⁻¹
B. mol L⁻¹ s⁻¹
C. L mol⁻¹ s⁻¹
D. mol² L⁻² s⁻¹
✅ Answer: B. mol L⁻¹ s⁻¹
18. Unit of rate constant for first-order reaction is:
A. mol L⁻¹ s⁻¹
B. L mol⁻¹ s⁻¹
C. s⁻¹
D. mol² L⁻² s⁻¹
✅ Answer: C. s⁻¹
19. Rate equation for zero-order reaction A + B → C is:
A. Rate = k[A][B]
B. Rate = k
C. Rate = k[A]
D. Rate = k[B]
✅ Answer: B. Rate = k
20. Standard hydrogen electrode potential is:
A. +1.00 V
B. −0.76 V
C. +0.34 V
D. 0.00 V
✅ Answer: D. 0.00 V
21. Removing salt bridge from galvanic cell results in:
A. Increase in voltage
B. No change
C. Sudden drop to zero voltage
D. Fluctuating voltage
✅ Answer: C. Sudden drop to zero voltage
22. On dilution, specific conductance of solution:
A. Increases
B. Decreases
C. Remains constant
D. Becomes zero
✅ Answer: B. Decreases
23. Strongest reducing agent has:
A. Highest positive E°
B. Zero E°
C. Most negative E°
D. Same E° as hydrogen
✅ Answer: C. Most negative E°
24. Electrode potential depends on:
A. Nature of electrode
B. Concentration
C. Temperature
D. All of these
✅ Answer: D. All of these
25. Which is a colligative property?
A. Density
B. Surface tension
C. Osmotic pressure
D. Viscosity
✅ Answer: C. Osmotic pressure
26. Which is NOT a colligative property?
A. Osmotic pressure
B. Depression in freezing point
C. Elevation in boiling point
D. Surface tension
✅ Answer: D. Surface tension
27. Depression in freezing point depends on:
A. Nature of solute
B. Number of solute particles
C. Nature of solvent
D. Chemical properties
✅ Answer: B. Number of solute particles
28. Which one is a non-electrolyte?
A. NaCl
B. HCl
C. Glucose
D. KOH
✅ Answer: C. Glucose
29. pH of pure water at 25°C is:
A. 5
B. 6
C. 7
D. 8
✅ Answer: C. 7
30. Acidic solution has pH:
A. >7
B. =7
C. <7
D. 14
✅ Answer: C. <7
31. Which gas turns lime water milky?
A. SO₂
B. CO₂
C. NH₃
D. H₂
✅ Answer: B. CO₂
32. Hardness of water is caused by:
A. Na⁺ and K⁺ salts
B. Ca²⁺ and Mg²⁺ salts
C. Fe²⁺ salts
D. Al³⁺ salts
✅ Answer: B. Ca²⁺ and Mg²⁺ salts
33. Temporary hardness is removed by:
A. Filtration
B. Boiling
C. Distillation
D. Chlorination
✅ Answer: B. Boiling
34. Permanent hardness is removed by:
A. Boiling
B. Lime water
C. Zeolite process
D. Filtration
✅ Answer: C. Zeolite process
35. Rusting of iron is an example of:
A. Reduction
B. Oxidation
C. Neutralization
D. Sublimation
✅ Answer: B. Oxidation
36. Catalyst increases rate of reaction by:
A. Increasing temperature
B. Increasing activation energy
C. Decreasing activation energy
D. Increasing pressure
✅ Answer: C. Decreasing activation energy
37. Which metal is most reactive?
A. Cu
B. Fe
C. Na
D. Ag
✅ Answer: C. Na
38. Which compound shows hydrogen bonding?
A. CH₄
B. NH₃
C. CO₂
D. HCl
✅ Answer: B. NH₃
39. Molecular mass of H₂SO₄ is:
A. 96
B. 98
C. 100
D. 102
✅ Answer: B. 98
40. Avogadro number is:
A. 6.023 × 10²²
B. 6.023 × 10²³
C. 6.023 × 10²¹
D. 6.023 × 10²⁴
✅ Answer: B. 6.023 × 10²³
41. Which is a strong acid?
A. CH₃COOH
B. H₂CO₃
C. HCl
D. NH₄OH
✅ Answer: C. HCl
42. Which compound is amphoteric?
A. NaOH
B. HCl
C. Al₂O₃
D. CO₂
✅ Answer: C. Al₂O₃
43. Oxidation means:
A. Loss of electrons
B. Gain of electrons
C. Gain of protons
D. Loss of neutrons
✅ Answer: A. Loss of electrons
44. Reduction means:
A. Loss of electrons
B. Gain of electrons
C. Loss of oxygen
D. Both B and C
✅ Answer: D. Both B and C
45. Which metal is liquid at room temperature?
A. Iron
B. Mercury
C. Sodium
D. Zinc
✅ Answer: B. Mercury
46. Chemical formula of washing soda is:
A. Na₂CO₃
B. NaHCO₃
C. Na₂CO₃·10H₂O
D. NaOH
✅ Answer: C. Na₂CO₃·10H₂O
47. Which compound is used in photography?
A. NaCl
B. AgBr
C. KCl
D. CaCO₃
✅ Answer: B. AgBr
48. Which gas is released during photosynthesis?
A. CO₂
B. O₂
C. N₂
D. H₂
✅ Answer: B. O₂
49. The pH of blood is approximately:
A. 6.5
B. 7.0
C. 7.4
D. 8.0
✅ Answer: C. 7.4
50. Which is the universal solvent?
A. Alcohol
B. Benzene
C. Water
D. Ether
✅ Answer: C. Water
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