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RRB ALP Chemistry Questions with Answers & Explanations

20 Chemistry questions from the Basic Science & Engineering section of RRB ALP, 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

CNG mainly contains

  1. APropane
  2. BMethane
  3. CButane
  4. DEthylene
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Answer: (B) Methane
Question 2

The atomic number of an element is the number of

  1. AProtons in its nucleus
  2. BElectrons and neutrons
  3. CNucleons
  4. DNeutrons in its nucleus
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Answer: (A) Protons in its nucleus
Question 3

The pH of pure water at 25 °C is

  1. A14
  2. B7
  3. C5
  4. D0
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Answer: (B) 7
Question 4

Plaster of Paris is prepared from

  1. AGypsum
  2. BBauxite
  3. CLimestone
  4. DHaematite
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Answer: (A) Gypsum
Question 5

Lemon juice contains

  1. ACitric acid
  2. BFormic acid
  3. COxalic acid
  4. DAcetic acid
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Answer: (A) Citric acid
Question 6

The most abundant gas in the Earth's atmosphere is

  1. ACarbon dioxide
  2. BNitrogen
  3. COxygen
  4. DArgon
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Answer: (B) Nitrogen
Question 7

Diamond and graphite are allotropes of

  1. ACarbon
  2. BSulphur
  3. CSilicon
  4. DPhosphorus
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Answer: (A) Carbon
Question 8

The chemical symbol of iron is

  1. AIn
  2. BI
  3. CFe
  4. DIr
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Answer: (C) Fe
Question 9

The chemical formula of common salt is

  1. ANaOH
  2. BKCl
  3. CNaCl
  4. DNa₂CO₃
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Answer: (C) NaCl
Question 10

Which metal is liquid at room temperature?

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

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Question 11

Galvanisation is the coating of iron with

  1. ACopper
  2. BZinc
  3. CTin
  4. DChromium
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Answer: (B) Zinc
Question 12

Lemon juice contains

  1. AFormic acid
  2. BOxalic acid
  3. CCitric acid
  4. DAcetic acid
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Answer: (C) Citric acid
Question 13

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 14

Vinegar contains

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

The atomic number of an element is the number of

  1. ANucleons
  2. BElectrons and neutrons
  3. CNeutrons in its nucleus
  4. DProtons in its nucleus
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Answer: (D) Protons in its nucleus
Question 16

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
Question 17

The main ore of aluminium is

  1. AGalena
  2. BBauxite
  3. CCinnabar
  4. DHaematite
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Answer: (B) Bauxite
Question 18

LPG mainly contains

  1. AEthane and hydrogen
  2. BCarbon monoxide
  3. CMethane only
  4. DButane and propane
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Answer: (D) Butane and propane
Question 19

The chemical symbol of gold is

  1. AGd
  2. BAu
  3. CAg
  4. DGo
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Answer: (B) Au
Question 20

The main ore of aluminium is

  1. ACinnabar
  2. BHaematite
  3. CGalena
  4. DBauxite
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Answer: (D) Bauxite

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

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