HomeQ&A. 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.

. 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.

ChemistryClass 10ICSEAnswered 27 Mar 2026

Answer

Silver will be metal X
Chlorine is the gas evolved when MX salt is exposed to light
Silver chloride is the metal salt MX which is used in black and white
Silver nitrate and Sodium chloride are the two salt solutions which on mixing together produce a precipitate of salt silver chloride
Decomposition reaction is the reaction taking place here when compound decomposes to form simpler new products. Silver chloride decomposes to form silver and chloride gas

2AgCl → 2Ag + Cl2

Chemistry · Class 10

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