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SSC GD Constable Chemistry Questions with Answers & Explanations

19 Chemistry questions from the General Knowledge & General Awareness section of SSC GD Constable, 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

Diamond and graphite are allotropes of

  1. ASilicon
  2. BPhosphorus
  3. CSulphur
  4. DCarbon
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Answer: (D) Carbon
Question 2

Lemon juice contains

  1. AOxalic acid
  2. BAcetic acid
  3. CFormic acid
  4. DCitric acid
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Answer: (D) Citric acid
Question 3

The chemical formula of water is

  1. AH₂O₂
  2. BH₃O
  3. CHO
  4. DH₂O
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Answer: (D) H₂O
Question 4

Rusting of iron requires

  1. AOnly oxygen
  2. BOnly water
  3. COxygen and moisture
  4. DCarbon dioxide only
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Answer: (C) Oxygen and moisture
Question 5

Washing soda is chemically

  1. ASodium carbonate
  2. BSodium bicarbonate
  3. CSodium hydroxide
  4. DCalcium hydroxide
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Answer: (A) Sodium carbonate
Question 6

The atomic number of an element is the number of

  1. AProtons in its nucleus
  2. BNeutrons in its nucleus
  3. CNucleons
  4. DElectrons and neutrons
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Answer: (A) Protons in its nucleus
Question 7

A solution with pH less than 7 is

  1. ASaline
  2. BNeutral
  3. CBasic
  4. DAcidic
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Answer: (D) Acidic
Question 8

LPG mainly contains

  1. AButane and propane
  2. BMethane only
  3. CCarbon monoxide
  4. DEthane and hydrogen
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Answer: (A) Butane and propane
Question 9

The chemical symbol of iron is

  1. AIn
  2. BIr
  3. CI
  4. DFe
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Answer: (D) Fe
Question 10

The most abundant gas in the Earth's atmosphere is

  1. ANitrogen
  2. BCarbon dioxide
  3. CArgon
  4. DOxygen
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Answer: (A) Nitrogen

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Question 11

The hardest natural substance is

  1. ADiamond
  2. BIron
  3. CQuartz
  4. DGraphite
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Answer: (A) Diamond
Question 12

The lightest element is

  1. AHydrogen
  2. BLithium
  3. CHelium
  4. DOxygen
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Answer: (A) Hydrogen
Question 13

Which gas is known as "laughing gas"?

  1. AAmmonia
  2. BNitrogen dioxide
  3. CNitric oxide
  4. DNitrous oxide
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Answer: (D) Nitrous oxide
Question 14

The chemical symbol of sodium is

  1. ANa
  2. BSo
  3. CS
  4. DSd
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Answer: (A) Na
Question 15

Which metal is liquid at room temperature?

  1. ASodium
  2. BMercury
  3. CAluminium
  4. DLead
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Answer: (B) Mercury
Question 16

Which metal is liquid at room temperature?

  1. AMercury
  2. BLead
  3. CSodium
  4. DAluminium
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Answer: (A) Mercury
Question 17

The chemical formula of water is

  1. AHO
  2. BH₂O
  3. CH₃O
  4. DH₂O₂
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Answer: (B) H₂O
Question 18

Rusting of iron requires

  1. AOnly water
  2. BOxygen and moisture
  3. CCarbon dioxide only
  4. DOnly oxygen
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Answer: (B) Oxygen and moisture
Question 19

The pH of pure water at 25 °C is

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

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

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