Question

Which alkali metal carbonate decomposes on heating to liberate $CO_{2}$ gas.

• A. $Li_{2}CO_{3}$
• B. $CaCO_{3}$
• C. $Na_{2}CO_{3}$
• D. $Al_{2}CO_{3}$

Answer 1

Answer: (A)

$Li_{2}CO_{3}$

Answer 2

Among alkali metal carbonates only $Li_{2}CO_{3}$

decomposes.

$Li_{2}CO_{3}\overset{\quad\Delta\quad}{\rightarrow}Li_{2}O + CO_{2} \uparrow$