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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.
- What do you think metal M is?
- What could be gas X2?
- Name the metal salt MX.
- Name any two salt solutions which on mixing together can produce a precipitate of salt MX.
- 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
- Metal M is silver (Ag). Silver is a highly lustrous, precious metal used for making ornaments and jewellery.
- The gas X2 is chlorine (Cl2). Chlorine gas is a key chemical used in the manufacturing of bleaching powder.
- Silver chloride (AgCl)
- Mixing Silver nitrate (AgNO3) and sodium chloride (NaCl) solutions will produce an insoluble, white precipitate of silver chloride (MX).
- Exposing the salt to light results in a photolytic decomposition reaction (or photolysis).
\[\ce{2AgCl_{(s)} ->[Light] 2Ag_{(s)} + Cl2_{(g)}}\]
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