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MPSC Rajyaseva Chemistry Questions with Answers & Explanations

20 Chemistry questions from the General Science section of MPSC Rajyaseva, each with the correct answer and a worked explanation. Try each question first, then tap Show answer to check. When you're ready, take the timed chapter-wise test to see your all-India rank.

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Question 1

Vinegar contains

  1. AAcetic acid
  2. BCitric acid
  3. CLactic acid
  4. DTartaric acid
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Answer: (A) Acetic acid
Question 2

The chemical symbol of gold is

  1. AGo
  2. BGd
  3. CAg
  4. DAu
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Answer: (D) Au
Question 3

LPG mainly contains

  1. AButane and propane
  2. BEthane and hydrogen
  3. CMethane only
  4. DCarbon monoxide
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Answer: (A) Butane and propane
Question 4

The gas used in fire extinguishers is

  1. AHydrogen
  2. BNitrogen dioxide
  3. COxygen
  4. DCarbon dioxide
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Answer: (D) Carbon dioxide
Question 5

The atomic number of an element is the number of

  1. ANeutrons in its nucleus
  2. BNucleons
  3. CProtons in its nucleus
  4. DElectrons and neutrons
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Answer: (C) Protons in its nucleus
Question 6

CNG mainly contains

  1. AButane
  2. BEthylene
  3. CMethane
  4. DPropane
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Answer: (C) Methane
Question 7

Baking soda is chemically

  1. ACalcium carbonate
  2. BSodium bicarbonate
  3. CSodium chloride
  4. DSodium carbonate
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Answer: (B) Sodium bicarbonate
Question 8

The gas used in fire extinguishers is

  1. ANitrogen dioxide
  2. BOxygen
  3. CCarbon dioxide
  4. DHydrogen
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Answer: (C) Carbon dioxide
Question 9

The chemical symbol of gold is

  1. AAu
  2. BAg
  3. CGd
  4. DGo
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Answer: (A) Au
Question 10

Which gas is known as "laughing gas"?

  1. ANitrous oxide
  2. BNitric oxide
  3. CNitrogen dioxide
  4. DAmmonia
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Answer: (A) Nitrous oxide

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Question 11

Plaster of Paris is prepared from

  1. ALimestone
  2. BGypsum
  3. CHaematite
  4. DBauxite
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Answer: (B) Gypsum
Question 12

Vinegar contains

  1. ALactic acid
  2. BCitric acid
  3. CTartaric acid
  4. DAcetic acid
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Answer: (D) Acetic acid
Question 13

The main ore of aluminium is

  1. AHaematite
  2. BCinnabar
  3. CBauxite
  4. DGalena
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Answer: (C) Bauxite
Question 14

Washing soda is chemically

  1. ASodium hydroxide
  2. BSodium bicarbonate
  3. CCalcium hydroxide
  4. DSodium carbonate
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Answer: (D) Sodium carbonate
Question 15

Galvanisation is the coating of iron with

  1. AZinc
  2. BChromium
  3. CCopper
  4. DTin
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Answer: (A) Zinc
Question 16

The chemical symbol of iron is

  1. AFe
  2. BIn
  3. CI
  4. DIr
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Answer: (A) Fe
Question 17

The atomic number of an element is the number of

  1. ANeutrons in its nucleus
  2. BElectrons and neutrons
  3. CNucleons
  4. DProtons in its nucleus
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Answer: (D) Protons in its nucleus
Question 18

The pH of pure water at 25 °C is

  1. A5
  2. B7
  3. C0
  4. D14
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Answer: (B) 7
Question 19

Which metal is liquid at room temperature?

  1. ALead
  2. BMercury
  3. CAluminium
  4. DSodium
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Answer: (B) Mercury
Question 20

CNG mainly contains

  1. AMethane
  2. BButane
  3. CEthylene
  4. DPropane
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Answer: (A) Methane

These are RankerClub practice questions written in the MPSC Rajyaseva pattern. They are not official SSC/IBPS/RRB papers.

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