Practice test

Chemical changes and reactions - Test Set 2

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

    Hydrogenation of vegetable oils using Nickel catalyst is an example of:
    1. Addition reaction
    2. Substitution reaction
    3. Elimination reaction
    4. Free-radical polymerization
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  2. Question 2

    In electrolytic refining electrolyte is a solution of-
    1. Acidified copper chloride
    2. Potassium chloride
    3. Sodium sulphate
    4. Acidified copper sulphate
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  3. Question 3

    Which one of the following does not represent the salt, calcium carbonate?
    1. Lime water
    2. Limestone
    3. Chalk
    4. Marble
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  4. Question 4

    Which one among the following is a covalent compound?
    1. Calcium chloride
    2. Magnesium fluoride
    3. Sodium chloride
    4. Carbon tetrachloride
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  5. Question 5

    _______________ character of a bond between two atoms is greater if the difference in their electronegativities is lesser.
    1. Polar
    2. Metallic
    3. Covalent
    4. Ionic
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  6. Question 6

    How many covalent bonds are present in a chloropropane molecule having molecular formula, C3H2CL
    1. 6
    2. 8
    3. 9
    4. 10
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  7. Question 7

    The atomic number of an element is 8. How many electrons will it gain to form a compound with sodium?
    1. One
    2. Two
    3. Three
    4. Four
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  8. Question 8

    Liquid water is denser than ice due to
    1. hydrogen bonding
    2. higher surface tension
    3. van der Waals' force
    4. covalent bonding
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  9. Question 9

    The chemical reaction in which heat release is called
    1. endothermic reaction
    2. combination reaction
    3. decomposition reaction
    4. exothermic reaction
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  10. Question 10

    Potassium permanganate is used in the purification of drinking water because it
    1. is a reducing agent
    2. is a oxidising agent
    3. is a bonding agent
    4. dissolves the impurities of water
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  11. Question 11

    The date of manufacture of food items fried in oil should be checked before buying because oils become rancid due to
    1. oxidation
    2. reduction
    3. hydrogenation
    4. decrease in viscosity
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  12. Question 12

    Browning of paper in old books is caused by
    1. frequent use
    2. lack of aeration
    3. collection of dust
    4. oxidation of cellulose
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  13. Question 13

    In a reaction, what is the loss of hydrogen by substance called as?
    1. Reduction
    2. Hydronisation
    3. Oxidation
    4. Both reduction and hydronisation
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  14. Question 14

    Bleaching action of chlorine is due to which reaction?
    1. Oxidation
    2. Hydrolysis
    3. Redox
    4. Decomposition
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  15. Question 15

    Which one of the following nitrogen oxides has the highest oxidation number of the same element?
    1. NO
    2. NO2
    3. N2O
    4. N2O5
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  16. Question 16

    When a substance loses oxygen during a reaction, it is called ________ .
    1. corrosion
    2. oxidation
    3. reduction
    4. Both corrosion and oxidation
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  17. Question 17

    Which of the following element has always its oxidation number -1?
    1. F
    2. Cl
    3. Br
    4. I
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  18. Question 18

    The rusting in iron is-
    1. a physical process
    2. a chemical process
    3. reverse process
    4. a mixture
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  19. Question 19

    What happens in the rusting of iron?
    1. Decomposition
    2. Displacement
    3. Oxidation
    4. Reduction
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  20. Question 20

    Example of corrosion is
    1. black coating on silver
    2. green coating on copper
    3. brown coating on iron
    4. All of the above
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