explanation :
Mg is more active metal than Ag. so Mg can replace the silver from its salts . but Ag cannot replace Mg from its salts
it is known from standarard reduction potential values.
Mg has the value Eo = - 2.38 V
Ag gas the value Eo = +0.80
more negative potential more reactive .
reaction possible : Mg (s) + 2 AgNO3 (aq) ------------------> Mg(NO3)2(aq) + 2 Ag(s)
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