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SSC CPO SI/ASI Chemistry Questions with Answers & Explanations

20 Chemistry questions from the General Knowledge & General Awareness section of SSC CPO SI/ASI, 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

Which gas is known as "laughing gas"?

  1. ANitric oxide
  2. BNitrogen dioxide
  3. CAmmonia
  4. DNitrous oxide
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Answer: (D) Nitrous oxide
Question 2

The chemical symbol of gold is

  1. AGd
  2. BAu
  3. CAg
  4. DGo
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Answer: (B) Au
Question 3

The pH of pure water at 25 °C is

  1. A7
  2. B14
  3. C5
  4. D0
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Answer: (A) 7
Question 4

Diamond and graphite are allotropes of

  1. ASulphur
  2. BPhosphorus
  3. CSilicon
  4. DCarbon
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Answer: (D) Carbon
Question 5

A solution with pH less than 7 is

  1. ABasic
  2. BSaline
  3. CNeutral
  4. DAcidic
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Answer: (D) Acidic
Question 6

Rusting of iron requires

  1. AOxygen and moisture
  2. BCarbon dioxide only
  3. COnly oxygen
  4. DOnly water
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Answer: (A) Oxygen and moisture
Question 7

Plaster of Paris is prepared from

  1. AGypsum
  2. BLimestone
  3. CHaematite
  4. DBauxite
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Answer: (A) Gypsum
Question 8

The chemical formula of water is

  1. AH₂O₂
  2. BH₂O
  3. CHO
  4. DH₃O
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Answer: (B) H₂O
Question 9

The chemical symbol of sodium is

  1. ANa
  2. BSo
  3. CSd
  4. DS
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Answer: (A) Na
Question 10

Galvanisation is the coating of iron with

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

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Question 11

Baking soda is chemically

  1. ASodium carbonate
  2. BCalcium carbonate
  3. CSodium chloride
  4. DSodium bicarbonate
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Answer: (D) Sodium bicarbonate
Question 12

Lemon juice contains

  1. AOxalic acid
  2. BCitric acid
  3. CAcetic acid
  4. DFormic acid
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Answer: (B) Citric acid
Question 13

The chemical formula of common salt is

  1. ANaCl
  2. BKCl
  3. CNa₂CO₃
  4. DNaOH
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Answer: (A) NaCl
Question 14

The chemical symbol of iron is

  1. AIn
  2. BIr
  3. CI
  4. DFe
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Answer: (D) Fe
Question 15

The lightest element is

  1. ALithium
  2. BHelium
  3. CHydrogen
  4. DOxygen
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Answer: (C) Hydrogen
Question 16

The hardest natural substance is

  1. AGraphite
  2. BDiamond
  3. CIron
  4. DQuartz
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Answer: (B) Diamond
Question 17

The pH of pure water at 25 °C is

  1. A14
  2. B0
  3. C7
  4. D5
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Answer: (C) 7
Question 18

LPG mainly contains

  1. AButane and propane
  2. BMethane only
  3. CEthane and hydrogen
  4. DCarbon monoxide
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Answer: (A) Butane and propane
Question 19

The chemical formula of common salt is

  1. AKCl
  2. BNaCl
  3. CNaOH
  4. DNa₂CO₃
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Answer: (B) NaCl
Question 20

The hardest natural substance is

  1. ADiamond
  2. BGraphite
  3. CIron
  4. DQuartz
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Answer: (A) Diamond

These are RankerClub practice questions written in the SSC CPO SI/ASI pattern. They are not official SSC/IBPS/RRB papers.

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