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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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