Practice test

Chemical changes and reactions - Test Set 3

Review 20 exam-focused questions with detailed explanations, then start the interactive test when you are ready.

20 questions

Questions and explanations

  1. Question 1

    The iron sheet kept in moist air covered with rust.
    The rust is
    1. a mixture of iron, oxygen and water
    2. an element
    3. a compound
    4. a mixture of iron and dust
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  2. Question 2

    On rusting in the iron
    1. its weight changes
    2. its weight is increased
    3. its weight is decreased
    4. no changes take place
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  3. Question 3

    During galvanisation, which metal is used for coating iron and steel objects, preventing them from rusting.
    1. Copper
    2. Aluminium
    3. Bronze
    4. Zinc
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  4. Question 4

    Pasteurisation is related to
    1. sterilisation of milk
    2. dehydration of milk
    3. fermentation of milk
    4. distillation of milk
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  5. Question 5

    The process by which Milk is converted into curd is called-
    1. pasteurisation
    2. vermalisation
    3. fermentation
    4. retting
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  6. Question 6

    Which one of the following is the chemical formula of gypsum?
    1. CaSO₄·2H₂O
    2. Ca₂SiO₄
    3. 2CaSO₄·H₂O
    4. CaSO₄
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  7. Question 7

    Which one among the following does not wet the walls of the glass vessel in which it is kept?
    1. Water
    2. Alcohol
    3. Mercury
    4. Phenol
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  8. Question 8

    The process whereby certain minerals absorb water, expand, and change is called as-
    1. Oxidation
    2. Hydration
    3. Hydrolysis
    4. Carbonation
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  9. Question 9

    Which one of the following statements about water is not true?
    1. Hydrogen bonds are present in liquid water.
    2. Water has a high boiling point.
    3. Water has a high heat of fusion.
    4. Water is a non-polar molecule.
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  10. Question 10

    Which one of the following is not an example of a redox reaction?
    1. AlCl₃ + 3H₂O → Al(OH)₃ + 3HCl
    2. 2NaH → 2Na + H₂
    3. 4Fe + 3O₂ → 2Fe₂O₃
    4. CuSO₄ + Zn → Cu + ZnSO₄
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  11. Question 11

    Which one of the following is a chemical change?
    1. Dissolving sugar in water
    2. Melting of ice
    3. Crystallization
    4. Milk turning sour
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  12. Question 12

    Which chemical law proposes that ‘soft drinks and soda bottles are sealed under high pressure to increase the solubility of CO₂’?
    1. Dalton’s law
    2. Henry’s law
    3. Ohm’s law
    4. Raoult’s law
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  13. Question 13

    Which one of the following can be categorised as a solution?
    1. Coal
    2. Salt
    3. Sea Water
    4. Diamond
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  14. Question 14

    ______ is a process in which impure water is boiled and the steam is collected and condensed in a separate container, leaving many of the solid contaminants behind.
    1. Decantation
    2. Distillation
    3. Filtration
    4. Sedimentation
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  15. Question 15

    What is the boiling point of water at sea level?
    1. 100°C
    2. 250°C
    3. 50°C
    4. 150°C
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  16. Question 16

    Which chemical reaction takes place during the cooking of meat?
    1. The Gattermann reaction
    2. The Finkelstein reaction
    3. The Maillard reaction
    4. The Swartz reaction
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  17. Question 17

    The oxidation number of nickel in K₄[Ni(CN)₄] is:
    1. Zero
    2. +4
    3. -4
    4. +8
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  18. Question 18

    A battery converts ______ energy to electrical energy.
    1. mechanical
    2. chemical
    3. light
    4. heat
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  19. Question 19

    Which one of the following metals pollutes the air of a city having a large number of automobiles?
    1. Cadmium
    2. Chromium
    3. Lead
    4. Copper
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  20. Question 20

    Iron rusts quickly in:
    1. Rainwater
    2. Seawater
    3. Distilled water
    4. River water
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