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Agniveer Navy Chemistry Questions with Answers & Explanations

20 Chemistry questions from the Science section of Agniveer Navy, 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 hardest natural substance is

  1. AIron
  2. BGraphite
  3. CDiamond
  4. DQuartz
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Answer: (C) Diamond
Question 2

The chemical formula of water is

  1. AH₂O
  2. BH₃O
  3. CHO
  4. DH₂O₂
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Answer: (A) H₂O
Question 3

The chemical symbol of iron is

  1. AIn
  2. BI
  3. CIr
  4. DFe
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Answer: (D) Fe
Question 4

Diamond and graphite are allotropes of

  1. APhosphorus
  2. BCarbon
  3. CSilicon
  4. DSulphur
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Answer: (B) Carbon
Question 5

Which metal is liquid at room temperature?

  1. AMercury
  2. BAluminium
  3. CLead
  4. DSodium
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Answer: (A) Mercury
Question 6

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 7

The main ore of aluminium is

  1. AGalena
  2. BHaematite
  3. CBauxite
  4. DCinnabar
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Answer: (C) Bauxite
Question 8

Baking soda is chemically

  1. ASodium carbonate
  2. BCalcium carbonate
  3. CSodium bicarbonate
  4. DSodium chloride
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Answer: (C) Sodium bicarbonate
Question 9

The gas used in fire extinguishers is

  1. ANitrogen dioxide
  2. BCarbon dioxide
  3. CHydrogen
  4. DOxygen
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Answer: (B) Carbon dioxide
Question 10

Rusting of iron requires

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

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Question 11

The hardest natural substance is

  1. AIron
  2. BGraphite
  3. CQuartz
  4. DDiamond
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Answer: (D) Diamond
Question 12

Which metal is liquid at room temperature?

  1. AAluminium
  2. BSodium
  3. CMercury
  4. DLead
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Answer: (C) Mercury
Question 13

The pH of pure water at 25 °C is

  1. A7
  2. B5
  3. C0
  4. D14
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Answer: (A) 7
Question 14

The most abundant gas in the Earth's atmosphere is

  1. AOxygen
  2. BCarbon dioxide
  3. CArgon
  4. DNitrogen
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Answer: (D) Nitrogen
Question 15

Diamond and graphite are allotropes of

  1. ASulphur
  2. BPhosphorus
  3. CSilicon
  4. DCarbon
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Answer: (D) Carbon
Question 16

Which gas is known as "laughing gas"?

  1. ANitric oxide
  2. BAmmonia
  3. CNitrogen dioxide
  4. DNitrous oxide
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Answer: (D) Nitrous oxide
Question 17

Baking soda is chemically

  1. ASodium carbonate
  2. BSodium bicarbonate
  3. CSodium chloride
  4. DCalcium carbonate
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Answer: (B) Sodium bicarbonate
Question 18

The chemical symbol of gold is

  1. AGd
  2. BGo
  3. CAg
  4. DAu
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Answer: (D) Au
Question 19

Lemon juice contains

  1. AAcetic acid
  2. BFormic acid
  3. CCitric acid
  4. DOxalic acid
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Answer: (C) Citric acid
Question 20

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

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

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