Q2 of 28 Page 13

Give an example of a double displacement reaction.

When sodium sulphate solution is added to barium chloride solution, then a double displacement reaction takes place in which a white precipitate of barium sulphate is formed along with sodium chloride solution.


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Why is double the amount of a gas collected in one of the test-tubes in the electrolysis of water activity? Name this gas.

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Why does the colour of copper sulphate solution change when an iron nail is dipped in it?

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Identify the substances that are oxidised and the substances that are reduced in the following reactions:

(i) 4Na (s) + O2 (g) → 2Na20 (s)


(ii) CuO (s) + H2 (g) → Cu (s) + H2O (l)

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Which of the statements about the reaction below are incorrect?

2Pb0 (s) + C (s) → 2Pb (s) + CO2(g)

(a) Lead is getting reduced

(b) Carbon dioxide is getting oxidised

(c) Carbon is getting oxidised

(d) Lead oxide is getting reduced