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Chemistry MCQs

8 Questions Subject Test
Subject Preparation Guide

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

Atomic StructureChemical BondingReactionsOrganic Chemistry
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1
Hard nts Uploaded: 04 Sep 2026

What is the process of breaking down large hydrocarbon molecules into smaller ones called?

  • A Distillation
  • B Reforming
  • C Cracking
  • D Polymerization
2
Hard nts Uploaded: 06 Aug 2026

What is the oxidation state of oxygen in most compounds?

  • A -2
  • B -1
  • C +1
  • D +2
3
Hard nts Uploaded: 06 Aug 2026

What is the term for elements with the same number of protons but different numbers of neutrons?

  • A Allotropes
  • B Isomers
  • C Isobars
  • D Isotopes
4
Hard nts Uploaded: 04 Sep 2026

What is the name given to elements 58-71 in the periodic table?

  • A Lanthanides
  • B Actinides
  • C Transition metals
  • D Alkali metals
5
Hard nts Uploaded: 04 Sep 2026

Which term describes different structural forms of the same element in the same physical state?

  • A Allotropes
  • B Isomers
  • C Isotopes
  • D Isobars
6
Hard nts Uploaded: 04 Sep 2026

What is Hess's Law used for?

  • A Determining equilibrium constant
  • B Finding molecular geometry
  • C Measuring reaction rate
  • D Calculating enthalpy of reactions indirectly
7
Hard nts Uploaded: 04 Sep 2026

Which metal is extracted using the electrolytic reduction method due to its high reactivity?

  • A Zinc
  • B Iron
  • C Aluminum
  • D Copper
8
Hard nts Uploaded: 04 Sep 2026

Graham's Law of diffusion relates rate of diffusion to:

  • A Pressure only
  • B Temperature only
  • C Molar mass directly
  • D Square root of molar mass
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