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RRB JE Chemistry Questions with Answers & Explanations

20 Chemistry questions from the General Science section of RRB JE, 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 formula of water is

  1. AHO
  2. BH₂O₂
  3. CH₃O
  4. DH₂O
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Answer: (D) H₂O
Question 2

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 3

The hardest natural substance is

  1. AGraphite
  2. BQuartz
  3. CIron
  4. DDiamond
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Answer: (D) Diamond
Question 4

Galvanisation is the coating of iron with

  1. ACopper
  2. BZinc
  3. CChromium
  4. DTin
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Answer: (B) Zinc
Question 5

The gas used in fire extinguishers is

  1. ACarbon dioxide
  2. BHydrogen
  3. COxygen
  4. DNitrogen dioxide
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Answer: (A) Carbon dioxide
Question 6

The pH of pure water at 25 °C is

  1. A7
  2. B0
  3. C5
  4. D14
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Answer: (A) 7
Question 7

The atomic number of an element is the number of

  1. AProtons in its nucleus
  2. BElectrons and neutrons
  3. CNeutrons in its nucleus
  4. DNucleons
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Answer: (A) Protons in its nucleus
Question 8

LPG mainly contains

  1. ACarbon monoxide
  2. BEthane and hydrogen
  3. CButane and propane
  4. DMethane only
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Answer: (C) Butane and propane
Question 9

Plaster of Paris is prepared from

  1. AGypsum
  2. BBauxite
  3. CLimestone
  4. DHaematite
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Answer: (A) Gypsum
Question 10

The chemical symbol of gold is

  1. AAu
  2. BAg
  3. CGo
  4. DGd
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Answer: (A) Au

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Question 11

The lightest element is

  1. ALithium
  2. BHelium
  3. COxygen
  4. DHydrogen
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Answer: (D) Hydrogen
Question 12

The most abundant gas in the Earth's atmosphere is

  1. ANitrogen
  2. BArgon
  3. COxygen
  4. DCarbon dioxide
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Answer: (A) Nitrogen
Question 13

Which gas is known as "laughing gas"?

  1. ANitric oxide
  2. BNitrous oxide
  3. CAmmonia
  4. DNitrogen dioxide
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Answer: (B) Nitrous oxide
Question 14

The chemical formula of common salt is

  1. ANaOH
  2. BNaCl
  3. CNa₂CO₃
  4. DKCl
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Answer: (B) NaCl
Question 15

The atomic number of an element is the number of

  1. ANucleons
  2. BProtons in its nucleus
  3. CNeutrons in its nucleus
  4. DElectrons and neutrons
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Answer: (B) Protons in its nucleus
Question 16

Which metal is liquid at room temperature?

  1. AAluminium
  2. BSodium
  3. CLead
  4. DMercury
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Answer: (D) Mercury
Question 17

Vinegar contains

  1. ALactic acid
  2. BCitric acid
  3. CTartaric acid
  4. DAcetic acid
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Answer: (D) Acetic acid
Question 18

The main ore of aluminium is

  1. AGalena
  2. BCinnabar
  3. CHaematite
  4. DBauxite
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Answer: (D) Bauxite
Question 19

Galvanisation is the coating of iron with

  1. ATin
  2. BCopper
  3. CZinc
  4. DChromium
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Answer: (C) Zinc
Question 20

The chemical symbol of iron is

  1. AI
  2. BFe
  3. CIn
  4. DIr
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Answer: (B) Fe

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

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