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5 questions · timed · auto-graded

MCQ 11 Mark
A decomposition reaction is represented as
  • AB → A + B
  • B
    A + B → AB
  • C
    A → B
  • D
    A+B → B + A
Answer
Correct option: A.
AB → A + B
AB → A + B
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MCQ 21 Mark
The following reaction is used for the preparation of oxygen gas in the laboratory
$2 K C l O _3 \xrightarrow[\text { catalyst }]{\text { heat }} 2 K C l + 3 0 _{ 2 }$
Which of the following statements is / are correct about the reaction?
  • It is a decomposition reaction and takes place when heat is supplied.
  • B
    It is a combination reaction.
  • C
    It is a decomposition reaction and accompanied by the release of heat.
  • D
    It is a decomposition reaction and takes place in the presence of light.
Answer
Correct option: A.
It is a decomposition reaction and takes place when heat is supplied.
It is a decomposition reaction and takes place when heat is supplied.
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MCQ 31 Mark
Chemical equation are balanced to satisfy the
  • Law of conservation of mass
  • B
    Law of constant proportions
  • C
    Law of reciprocal proportions
  • D
    Law of multiple proportions.
Answer
Correct option: A.
Law of conservation of mass
Law of conservation of mass
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MCQ 41 Mark
Which of the following is not a chemical change ?
  • A
    Rusting of iron
  • B
    Cooking of food
  • C
    Digestion of food
  • Freezing of water
Answer
Correct option: D.
Freezing of water
Freezing of water
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MCQ 51 Mark
Which of the following is / are characteristic (s) of a physical change ?
  • A
    Temporary change
  • B
    Reversible
  • C
    Formation of no new substance AH of the above
  • All of the above
Answer
Correct option: D.
All of the above
All of the above
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MCQ - CHEMISTRY STD 7 Questions - Vidyadip