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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Standard X

Chemistry

Calcination

A metal salt ...

Question

A metal salt MX when exposed to light splits up to form metal M and a gas X₂. Metal M is used in making ornaments whereas gas X₂ 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 X₂?
(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) Metal M is silver (Ag).

(b) Gas X₂ is chlorine (Cl₂).

(c) Metal salt MX is AgCl.

(d) Solution of sodium chloride and silver nitrate on mixing together can produce a precipitate of salt MX.

(e) Decomposition reaction by light takes place.
2AgCl (s) → 2Ag (s) + Cl₂(g)

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(a) Metal M is silver (Ag). (b) Gas X2 is chlorine (Cl2). (c) Metal salt MX is AgCl. (d) Solution of sodium chloride and silver nitrate on mixing together can produce a precipitate of salt MX. (e) Decomposition reaction by light takes place. 2AgCl (s) → 2Ag (s) + Cl2 (g)

(a) Metal M is silver (Ag).

(b) Gas X₂ is chlorine (Cl₂).

(c) Metal salt MX is AgCl.

(d) Solution of sodium chloride and silver nitrate on mixing together can produce a precipitate of salt MX.

(e) Decomposition reaction by light takes place.
2AgCl (s) → 2Ag (s) + Cl₂(g)