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Chemistry MCQs

3 Questions Subject Test
Subject Preparation Guide

Prepare Chemistry with confidence

Practice the essential concepts of matter, atomic structure, chemical reactions, bonding and everyday applications of chemistry.

Atomic StructureChemical BondingReactionsOrganic Chemistry
Helpful for board examinations, entry tests and science-based competitive papers.
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Which of the following is a greenhouse gas?

  • A Carbon dioxide
  • B Nitrogen
  • C Argon
  • D Helium
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Correct Answer: Option A — Carbon dioxide
Explanation: Carbon dioxide traps heat in Earth's atmosphere, contributing to the greenhouse effect and global warming. It is released through natural processes and human activities such as burning fossil fuels and deforestation.
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Which element is the lightest gas known?

  • A Helium
  • B Hydrogen
  • C Nitrogen
  • D Oxygen
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Correct Answer: Option B — Hydrogen
Explanation: Hydrogen is the lightest and most abundant element in the universe, consisting of just one proton and one electron. Due to its low density, hydrogen gas rises quickly in air and is used in various industrial applications.
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What is the chemical symbol for Sodium?

  • A So
  • B Na
  • C Sd
  • D Su
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Correct Answer: Option B — Na
Explanation: Sodium's chemical symbol Na comes from its Latin name 'natrium'. It is a highly reactive alkali metal in group 1 of the periodic table and is essential for nerve function in the human body.
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