Answers

2015-05-19T11:52:12+05:30
THE REACTION IS KNOWN AS DECOMPOSITION REACTION...  
THE X  IS  SILVER CHLORIDE.

When Silver Chloride is exposed to light to form Silver and Chloride.

= 2 AgCl ⇒  2 Ag + Cl₂
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2015-05-19T11:59:02+05:30
Photo chemical reaction takes place.Here the metallic chloride which is used to make coins is silver chloride.
 
Equation: 2AgCl ⇒ 2Ag+Cl₂↑
  
When silver chloride exposed to sunlight it decomposes to chlorine gas and silver metal . In this process the white colour of silver metal turns from white to grey .
 
Here the X is silver . 
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