Chemistry MCQ Questions with answers

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Here Important Chemistry MCQ questions are added which are frequently asked in almost all the examinations. You can check the correct answer of any question on clicking the show answer button. The Correct answer will be displayed below. You can share any question with your friends on whatsapp by tapping Share button.

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📊 Chemistry
Q. The gas present in the stratosphere which filters out some of the sun's ultraviolet light and provides an effective shield against radiation damage to living things is
  • (A) helium
  • (B) ozone
  • (C) oxygen
  • (D) methane
💬 Discuss
✅ Correct Answer: (B) ozone
📊 Chemistry
Q. The most commonly used bleaching agent is
  • (A) alcohol
  • (B) carbon dioxide
  • (C) chlorine
  • (D) sodium chlorine
💬 Discuss
✅ Correct Answer: (C) chlorine
📊 Chemistry
Q. The nucleus of a hydrogen atom consists of
  • (A) 1 proton only
  • (B) 1 proton + 2 neutron
  • (C) 1 neutron only
  • (D) 1 electron only
💬 Discuss
✅ Correct Answer: (A) 1 proton only
📊 Chemistry
Q. The heat required to raise the temperature of body by 1 K is called
  • (A) specific heat
  • (B) thermal capacity
  • (C) water equivalent
  • (D) None of the above
💬 Discuss
✅ Correct Answer: (B) thermal capacity

Explanation: The heat required to raise the temperature of a body by 1 K is called thermal capacity. In other words, when q is the heat supplied to the body and the temperature raises by 1 K, then the thermal capacity of body is q.

📊 Chemistry
Q. The nuclear particles which are assumed to hold the nucleons together are
  • (A) electrons
  • (B) positrons
  • (C) neutrons
  • (D) mesons
💬 Discuss
✅ Correct Answer: (D) mesons
📊 Chemistry
Q. The mass of P4O10 that will be obtained from the reaction of 1.33 gram of P4 and 5.07 of oxygen is
  • (A) 2.05 gram
  • (B) 3.05 gram
  • (C) 4.05 gram
  • (D) 5.05 gram
💬 Discuss
✅ Correct Answer: (B) 3.05 gram
📊 Chemistry
Q. The octane number of zero is assigned to
  • (A) 2-methyl octane
  • (B) n-heptane
  • (C) iso-octane
  • (D) 3-methyl octane
💬 Discuss
✅ Correct Answer: (B) n-heptane
📊 Chemistry
Q. The metal that is used as a catalyst in the hydrogenation of oils is
  • (A) Ni
  • (B) Pb
  • (C) Cu
  • (D) Pt
💬 Discuss
✅ Correct Answer: (A) Ni
📊 Chemistry
Q. The most abundant rare gas in the atmosphere is
  • (A) He
  • (B) Ne
  • (C) Ar
  • (D) Xe
💬 Discuss
✅ Correct Answer: (C) Ar
📊 Chemistry
Q. The Latin word formica means ant. The name formic acid is derived from this Latin word because
  • (A) this acid, in ancient times, was used to eliminate ant-hills
  • (B) this corrosive acid is secreted by ants to drive away their enemies
  • (C) this acid was first obtained by the distillation of ants
  • (D) ants are attracted by the odour of this acid
💬 Discuss
✅ Correct Answer: (C) this acid was first obtained by the distillation of ants

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