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Physical and Chemical Changes CHEMISTRY - Physical and Chemical Changes

ICSE - STD 7 - CHEMISTRY (ICSE - English Medium). 48 questions in this chapter.

Question types

Physical and Chemical Changes question types

48 questions across 8 question groups — pick any mix to generate a CHEMISTRY paper with step-by-step answer keys.

48
Questions
8
Question groups
5
Question types
Sample Questions

Physical and Chemical Changes questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1MCQ1 Mark
A decomposition reaction is represented as
  • ✓
    AB → A + B
  • B
    A + B → AB
  • C
    A → B
  • D
    A+B → B + A

Answer: A.

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Q 2MCQ1 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: A.

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Q 3MCQ1 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: A.

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Q 4MCQ1 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: D.

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Q 5MCQ1 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: D.

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