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4 questions · timed · auto-graded

MCQ 11 Mark
Colloids have the particle size range between
  • $10^{-7}$ to $10^{-10} m$
  • B
    $10^{-10}$ to $10^{-12} m$
  • C
    $10^{-7}$ to $10^{-5} m$
  • D
    $10^{-12}$ to $10^{-15} m$
Answer
Correct option: A.
$10^{-7}$ to $10^{-10} m$
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MCQ 21 Mark
The ultimate source of all water on the earth is
  • A
    oceans and seas
  • B
    spring and wells
  • C
    rivers and lakes
  • rain
Answer
Correct option: D.
rain
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MCQ 31 Mark
Temporary hardness of water can be removed by
  • A
    filtering
  • boiling
  • C
    loading
  • D
    none of the above
Answer
Correct option: B.
boiling
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MCQ 41 Mark
Two gases found dissolved in natural water are
  • oxygen and carbon dioxide
  • B
    hydrogen and oxygen
  • C
    sulphur dioxide and hydrogen
  • D
    chlorine and ammonia
Answer
Correct option: A.
oxygen and carbon dioxide
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MCQ - CHEMISTRY STD 8 Questions - Vidyadip