Some Basic Concepts Of Chemistry Question 135
Question: 2.76 g of silver carbonate on being strongly heated yields a residue weighing
Options:
A) 2.15 g
B) 2.48 g
C) 2.32 g
D) 2.64 g
Show Answer
Answer:
Correct Answer: A
Solution:
[a] 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 $ Ag _2(s)\xrightarrow[{}]{Heat}2Ag(s)+CO _2(g)+\frac{1}{2}O _2(g) $
$ MW=276g $ $ 2\times 108=216g $ Hence, 2.76 g of $ Ag _2CO _3 $ oh heating will give $ \frac{216}{276}\times 2.75=2.16g $ Ag as residue.
