Chemical reaction and equations
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Preview (15 questions)Show answers
  • Question 1
    30 seconds
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    Q.

    which of the following is not a physical change

    answer choices

    boiling of water to give water vapours

    melting of ice to give water

    dissolution of salt in water

    combustion of LPG

  • Question 2
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    Q.

    The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is

    answer choices

    1:1

    2:1

    4:1

    1:2

  • Question 3
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    Q.

    The removal of oxygen from a substance is called :

    answer choices

    oxidation

    corrosion

    reduction

    rancidity

  • Question 4
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    Q.

    The term used to indicate the development of unpleasant smell and taste in fat and oil containing foods due

    to aerial oxidation is :

    answer choices

    acidity

    rancidity

    corrosion

    suspension

  • Question 5
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    Q.

    A white precipitate can be obtained by adding dilute sulphuric acid to :

    answer choices

    copper sulphate solution

    barium chloride

    silver nitrate

    ammonium carbonate

  • Question 6
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    Q.

    The process of respiration is :

    answer choices

    an oxidation reaction which is endothermic

    reduction reaction which is exothermic

    a combination reaction which is endothermic

    an oxidation reaction which is exothermic

  • Question 7
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    Q.

    Which of the following can be decomposed by the action of light ?

    answer choices

    NaCl

    KCl

    AgCl

    CuCl

  • Question 8
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    Q.

    reaction of hydrogen with oxygen to form water is

    answer choices

    decomposition reaction

    combination reaction

    displacement

    double displacement

  • Question 9
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    Q.

    The colour of the ppt BaSO4 is

    answer choices

    white

    blue

    green

    yellow

  • Question 10
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    Q.

    The colour of the ppt PbI2 is

    answer choices

    green

    yellow

    pink

    blue

  • Question 11
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    Q.

    when lead nitrate is heated

    answer choices

    lead oxide is formed

    brown fumes appear

    oxygen is released

    all of the above

  • Question 12
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    Q.

    Reduction is defined as

    answer choices

    removal of electron

    removal of hydrogen

    addition of hydrogen

    addition of oxygen

  • Question 13
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    Q.

    can copper displace iron from iron sulphate

    answer choices

    yes

    no

  • Question 14
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    Q.

    corrosion occurs in

    answer choices

    metal only

    non metal only

    both

    none

  • Question 15
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    Q.

    Formula of quick lime is

    answer choices

    BaO

    CaO

    CuO

    PbO

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