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CRPF CT/CISF HC Chemistry Questions with Answers & Explanations

20 Chemistry questions from the General Knowledge & Awareness section of CRPF CT/CISF HC, 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

The chemical symbol of iron is

  1. AIn
  2. BIr
  3. CI
  4. DFe
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Answer: (D) Fe
Question 2

The atomic number of an element is the number of

  1. ANucleons
  2. BNeutrons in its nucleus
  3. CProtons in its nucleus
  4. DElectrons and neutrons
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Answer: (C) Protons in its nucleus
Question 3

Galvanisation is the coating of iron with

  1. ATin
  2. BCopper
  3. CChromium
  4. DZinc
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Answer: (D) Zinc
Question 4

CNG mainly contains

  1. AEthylene
  2. BMethane
  3. CButane
  4. DPropane
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Answer: (B) Methane
Question 5

The hardest natural substance is

  1. ADiamond
  2. BGraphite
  3. CQuartz
  4. DIron
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Answer: (A) Diamond
Question 6

Washing soda is chemically

  1. ASodium carbonate
  2. BSodium hydroxide
  3. CSodium bicarbonate
  4. DCalcium hydroxide
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Answer: (A) Sodium carbonate
Question 7

Rusting of iron requires

  1. AOnly oxygen
  2. BOxygen and moisture
  3. COnly water
  4. DCarbon dioxide only
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Answer: (B) Oxygen and moisture
Question 8

The chemical symbol of sodium is

  1. AS
  2. BSo
  3. CNa
  4. DSd
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Answer: (C) Na
Question 9

LPG mainly contains

  1. AMethane only
  2. BCarbon monoxide
  3. CEthane and hydrogen
  4. DButane and propane
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Answer: (D) Butane and propane
Question 10

The chemical formula of water is

  1. AH₂O
  2. BHO
  3. CH₃O
  4. DH₂O₂
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Answer: (A) H₂O

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Question 11

Plaster of Paris is prepared from

  1. ALimestone
  2. BBauxite
  3. CGypsum
  4. DHaematite
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Answer: (C) Gypsum
Question 12

The chemical formula of common salt is

  1. ANaOH
  2. BNa₂CO₃
  3. CKCl
  4. DNaCl
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Answer: (D) NaCl
Question 13

The main ore of aluminium is

  1. AGalena
  2. BCinnabar
  3. CBauxite
  4. DHaematite
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Answer: (C) Bauxite
Question 14

Vinegar contains

  1. ALactic acid
  2. BCitric acid
  3. CTartaric acid
  4. DAcetic acid
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Answer: (D) Acetic acid
Question 15

The lightest element is

  1. AHelium
  2. BHydrogen
  3. CLithium
  4. DOxygen
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Answer: (B) Hydrogen
Question 16

The pH of pure water at 25 °C is

  1. A0
  2. B14
  3. C7
  4. D5
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Answer: (C) 7
Question 17

Galvanisation is the coating of iron with

  1. ACopper
  2. BZinc
  3. CTin
  4. DChromium
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Answer: (B) Zinc
Question 18

The chemical formula of water is

  1. AH₂O₂
  2. BH₃O
  3. CH₂O
  4. DHO
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Answer: (C) H₂O
Question 19

Which gas is known as "laughing gas"?

  1. ANitrogen dioxide
  2. BNitrous oxide
  3. CAmmonia
  4. DNitric oxide
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Answer: (B) Nitrous oxide
Question 20

Which metal is liquid at room temperature?

  1. AAluminium
  2. BSodium
  3. CMercury
  4. DLead
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Answer: (C) Mercury

These are RankerClub practice questions written in the CRPF CT/CISF HC pattern. They are not official SSC/IBPS/RRB papers.

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