A metal salt MX when exposed to light splits up to form metal M and a gas $X_{2}$ . Metal M is used in making ornaments whereas gas $X_{2}$ is used in making bleaching powder. The salt MX is itself used in black and white photography.

(a) What do you think metal M is ?

(b) What could be gas $X_{2}$ ?

(c) Name the metal salt MX.

(d) Name any two salt solutions which on mixing together can produce a precipitate of salt MX.

(e) What type of chemical reaction takes place when salt MX is exposed to light ? Write the equation of the reaction.

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Solution

(a) Silver.
(b) Chlorine.
(c) Silver chloride.
(d) Silver nitrate and Sodium chloride.
(e) Decomposition reaction;

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Q. A strip of metal X is dipped in a blue coloured salt solution YSO₄. After some time, a layer of metal Y from the salt solution is formed on the surface of metal strip X. Metal X is used in galvanisation whereas metal Y is used in making electric wires. Metal X and metal Y together form an alloy Z.
(a) What could metal X be?
(b) What could metal Y be?
(c) Name the metal salt YSO₄.
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(b) What is the colous of salt $X S O_{4}$ ?

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(e) What type of chemical reacion takes place in this case ?

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(a) What do you think metal X is ?

(b) Name the salt $Y N O_{3}$ .

(d) Name the salt $X (N O_{3})_{2}$ .

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Q. A red-brown metal X forms a salt XSO₄. When hydrogen sulphide gas is passed through an aqueous solution of XSO₄, then a black precipitate of XS is formed alongwith sulphuric acid solution.
(a) What could the salt XSO₄ be?
(b) What is the colour of salt XSO₄?
(c) Name the black precipitate XS.
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(e) What type of chemical reaction takes place in this case?

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(a) Silver. (b) Chlorine. (c) Silver chloride. (d) Silver nitrate and Sodium chloride. (e) Decomposition reaction;

(a) Silver.
(b) Chlorine.
(c) Silver chloride.
(d) Silver nitrate and Sodium chloride.
(e) Decomposition reaction;