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JIPMER 2014

Exam: JIPMER
Year: 2014
Subject: Chemistry
Chapter: s Block Elements

JIPMER 2014 · Chemistry · s Block Elements

Among the following the least thermally stable is

Among the following the least thermally stable is

Options

A $\mathrm{K}_2 \mathrm{CO}_3$
B $\mathrm{Na}_2 \mathrm{CO}_3$
C $\mathrm{BaCO}_3$
D $\mathrm{Li}_2 \mathrm{CO}_3$

Correct answer

D. $\mathrm{Li}_2 \mathrm{CO}_3$

Step-by-step solution

Thermal stability of carbonates increases on moving down a group. Thus, lithium carbonate,

\mathrm{Li}_2 \mathrm{CO}_3

is least thermally stable.

\mathrm{Li}_2 \mathrm{CO}_3 \xrightarrow{\Delta} \mathrm{Li}_2 \mathrm{O}+\mathrm{CO}_2

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