Question

write down a reaction for this. a white sunstance on exposure to sunlight gives a silvery grey metal and a yellowish green gas is evolved​

Answer 1

2AgCl---------≥2Ag+Cl2

Answer 2

Heyaa☺

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A white substance on exposure to sunlight gives a silvery grey metal and a yellowish green gas is evolved.

The substance is Silver bromide.

Reaction⤵⤵

2AgBr =》2Ag + Br2.

➡Decomposition of AgBr in presence of sunlight is photochemical decomposition reaction and this reaction is also called endothermic reaction as heat is absorbed.

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Hope you understand...✌