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UPPSC PCS Chemistry Questions with Answers & Explanations

20 Chemistry questions from the General Science section of UPPSC PCS, 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 symbol of sodium is

  1. ASo
  2. BS
  3. CNa
  4. DSd
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Answer: (C) Na
Question 2

Lemon juice contains

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

The chemical formula of water is

  1. AH₂O₂
  2. BHO
  3. CH₃O
  4. DH₂O
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Answer: (D) H₂O
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

Plaster of Paris is prepared from

  1. ABauxite
  2. BHaematite
  3. CGypsum
  4. DLimestone
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Answer: (C) Gypsum
Question 6

Which gas is known as "laughing gas"?

  1. ANitric oxide
  2. BAmmonia
  3. CNitrous oxide
  4. DNitrogen dioxide
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Answer: (C) Nitrous oxide
Question 7

Baking soda is chemically

  1. ACalcium carbonate
  2. BSodium carbonate
  3. CSodium chloride
  4. DSodium bicarbonate
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Answer: (D) Sodium bicarbonate
Question 8

The lightest element is

  1. AHydrogen
  2. BOxygen
  3. CLithium
  4. DHelium
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Answer: (A) Hydrogen
Question 9

The hardest natural substance is

  1. ADiamond
  2. BGraphite
  3. CQuartz
  4. DIron
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Answer: (A) Diamond
Question 10

Plaster of Paris is prepared from

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

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Question 11

Diamond and graphite are allotropes of

  1. APhosphorus
  2. BSulphur
  3. CCarbon
  4. DSilicon
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Answer: (C) Carbon
Question 12

The chemical symbol of sodium is

  1. ANa
  2. BS
  3. CSd
  4. DSo
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Answer: (A) Na
Question 13

The chemical symbol of gold is

  1. AGd
  2. BGo
  3. CAg
  4. DAu
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Answer: (D) Au
Question 14

The gas used in fire extinguishers is

  1. ANitrogen dioxide
  2. BOxygen
  3. CHydrogen
  4. DCarbon dioxide
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Answer: (D) Carbon dioxide
Question 15

Which gas is known as "laughing gas"?

  1. ANitric oxide
  2. BNitrous oxide
  3. CNitrogen dioxide
  4. DAmmonia
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Answer: (B) Nitrous oxide
Question 16

Rusting of iron requires

  1. ACarbon dioxide only
  2. BOnly oxygen
  3. COxygen and moisture
  4. DOnly water
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Answer: (C) Oxygen and moisture
Question 17

Galvanisation is the coating of iron with

  1. ATin
  2. BZinc
  3. CChromium
  4. DCopper
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Answer: (B) Zinc
Question 18

LPG mainly contains

  1. AEthane and hydrogen
  2. BButane and propane
  3. CCarbon monoxide
  4. DMethane only
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Answer: (B) Butane and propane
Question 19

The most abundant gas in the Earth's atmosphere is

  1. AArgon
  2. BCarbon dioxide
  3. COxygen
  4. DNitrogen
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Answer: (D) Nitrogen
Question 20

A solution with pH less than 7 is

  1. ABasic
  2. BNeutral
  3. CSaline
  4. DAcidic
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Answer: (D) Acidic

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

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