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Chemistry MCQs

26 Questions Subject Test
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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
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What is the main component of natural gas?

  • A Propane
  • B Butane
  • C Ethane
  • D Methane
2
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What is the value of the universal gas constant R in SI units?

  • A 8.314 J/mol·K
  • B 0.0821 J/mol·K
  • C 22.4 J/mol·K
  • D 1.987 J/mol·K
3
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A catalyst increases reaction rate by:

  • A Increasing activation energy
  • B Lowering activation energy
  • C Changing the equilibrium position
  • D Increasing temperature
4
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Which type of chemical formula shows how atoms are bonded and arranged in space?

  • A Molecular formula
  • B Empirical formula
  • C Ionic formula
  • D Structural formula
5
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Which gas is used in the Haber process to produce ammonia along with nitrogen?

  • A Chlorine
  • B Hydrogen
  • C Carbon dioxide
  • D Oxygen
6
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Which element is primarily used in nuclear power plants as fuel?

  • A Uranium
  • B Thorium
  • C Radium
  • D Plutonium
7
Medium pms Uploaded: 04 Sep 2026

What is the IUPAC name for the simplest aldehyde?

  • A Methanal
  • B Propanal
  • C Ethanal
  • D Methanol
8
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Which of the following is a noble gas?

  • A Chlorine
  • B Neon
  • C Sulfur
  • D Phosphorus
9
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What is the chemical symbol for Potassium?

  • A Po
  • B Pt
  • C K
  • D P
10
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Which process involves the splitting of a heavy nucleus into smaller nuclei?

  • A Beta decay
  • B Nuclear fusion
  • C Nuclear fission
  • D Radioactive decay
11
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Which gas is used in the manufacture of fertilizers?

  • A Oxygen
  • B Ammonia
  • C Chlorine
  • D Helium
12
Medium pms Uploaded: 04 Sep 2026

According to Bronsted-Lowry theory, a base is defined as a:

  • A Electron pair acceptor
  • B Proton donor
  • C Electron pair donor
  • D Proton acceptor
13
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Which vitamin is synthesized in human skin upon exposure to sunlight?

  • A Vitamin D
  • B Vitamin C
  • C Vitamin B12
  • D Vitamin A
14
Medium pms Uploaded: 06 Aug 2026

What is the valency of Oxygen?

  • A 1
  • B 3
  • C 2
  • D 4
15
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Which of the following is an example of an organic compound?

  • A Sodium chloride
  • B Glucose
  • C Water
  • D Carbon dioxide
16
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Which gas is responsible for the pungent smell in rotten eggs?

  • A Ammonia
  • B Methane
  • C Sulfur dioxide
  • D Hydrogen sulfide
17
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Which element is a metalloid?

  • A Silicon
  • B Calcium
  • C Aluminum
  • D Sodium
18
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Which element is used in the production of stainless steel to prevent rusting?

  • A Zinc
  • B Chromium
  • C Copper
  • D Tin
19
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Which type of reaction involves a single compound breaking down into two or more simpler substances?

  • A Combination reaction
  • B Displacement reaction
  • C Decomposition reaction
  • D Redox reaction only
20
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Which of the following best describes a metallic bond?

  • A Attraction between polar molecules
  • B Transfer of electrons between atoms
  • C Sharing of electron pairs
  • D Sea of delocalized electrons around metal cations
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