10th Chemical Reactions, Light

1. Which of the following statements about the given reaction are correct? 3Fe (s) + 4H2O (g) → Fe3O4 (s) + 4 H2 (g) (i) Iron metal is getting oxidised (ii) Water is getting reduced (iii) Water is acting as reducing agent (iv) Water is acting as oxidising agent (a) (i), (ii) and (iii) (b) (in) and (iv) (c) (i), (ii) and (iv) (d) (ii) and (iv)

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• B
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• D

2. Which of the following are exothermic processes? (i) Reaction of water with quick lime (ii) Dilution of an acid (iii) Evaporation of water (iv) Sublimation of camphor (crystals) (a) (i) and (ii) (b) (ii) and (iii) (c) (i) and (iv) (d) (ii) and (iv)

• A
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• D

3.

• A
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• D

4. The addition of oxygen and hydrogen to give water is an example of (a) Combination reaction (b) Displacement reaction (c) All of these (d) Decomposition reaction

• A
• B
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• D

5.

• A
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• D

6.

• A
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• C
• D

7. Which substance is used for white washing (a) Quick lime (b) washing soda (c) slaked lime (d) limestone

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• D

8.

• A
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• D

9.

• A
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• D

10.

• A
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• D