(a) Silver is the metal X.
(a) When MX salt is exposed to light, chlorine is produced as a gas.
(c) MX is the metal salt silver chloride that is employed in black and white photography.
(d) Silver nitrate and sodium chloride are two salt solutions that, when mixed together, produce a silver chloride precipitate.
(e) The decomposition reaction is the process by which a substance decomposes into simpler new compounds. Silver chloride breaks down into silver and chlorine gas.
2AgCl → 2Ag + Cl2