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Some quantity of yellow coloured powerd ...

Some quantity of yellow coloured powerd was kept in the sunlight for sometime. It was changed into gray colour. Guess the name power and the reaction.

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1) The powder may be silver bromide.
2) Silver bormide decomposes to silver and bromine in sunlight.
3) `2AgBr overset("Sunlight")rarr 2Ag+Br_(2).`
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