JEE Main & Advanced Sample Paper JEE Main Sample Paper-4

  • question_answer
    2.76 g of silver carbonate on being strongly heated yields a residue weighing

    A)  2.15 g                                  

    B)  2.48 g    

    C)  2.32 g                                  

    D)  2.64 g

    Correct Answer: A

    Solution :

    Unlike other metal carbonates that usually decomposes into metal oxides, liberating carbon dioxide, silver carbonate on heating decomposes into elemental silver liberating mixture of carbon dioxide and oxygen gas as \[A{{g}_{2}}(s)\xrightarrow[{}]{Heat}2Ag(s)+C{{O}_{2}}(g)+\frac{1}{2}{{O}_{2}}(g)\] \[MW=276g\]                    \[2\times 108=216g\] Hence, 2.76 g of \[A{{g}_{2}}C{{O}_{3}}\]oh heating will give \[\frac{216}{276}\times 2.75=2.16g\] Ag as residue.

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