Question

class 10 chemistry chapter:- chemical reaction and equations

Answer 1

Hey mate here is your answer :

(1).The metal M is Silver ( Ag ) and the gas X2 is Chlorine (Cl2).

(2). The chemical reaction involved is
$decomposition \: reaction.$

Equation :

AgCl2 = Ag + Cl2

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Answer 2

the metal is silver Ag
the gas is chorine Cl
the metal salt is silver chloride
when this salt is exposed to light decomposition reaction takes place