Q30 / 73 · NTA Abhyas (JEE Main) 2020 · Chemistry · Some Basic Concepts of Chemistry

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

Correct answer
A
2.16 g
B
2.48 g
C
2.32 g
D
2.64 g

Solution

\underset{2.76}{A g_{2} C O_{3}} \overset{Δ}{\to} A g_{2} O + C O_{2} \overset{Δ}{\to} \underset{(r e s i d u e)}{2 A g + \frac{1}{2} O_{2}}

Note:

A g_{2} O

is thermally unstable and decompose on heating liberating oxygen.

Molecular weight of

A g_{2} C O_{3} = 108 \times 2 + 12 + 16 \times 3 = 276 g

So 276 g of

A g_{2} C O_{3}

on heating gives residue

= 2 \times 108 = 216 g

of Ag

So 2.76 of

A g_{2} C O_{3}

on heating gives

= \frac{216}{276} \times 2.76

= 2.16 g

of Ag

Hence, the correct answer is option: 'A'.

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