Question

The correct order of decomposition temperature of \(MgCO_3\) (X), \(BaCO_3\) (Y), \(CaCO_3\) (Z) is:

• A. \( Y<Z<X \)
• B. \( X<Y<Z \)
• C. \( Y<X<Z \)
• D. \( X<Z<Y \)

Hint:

The decomposition temperature of metal carbonates increases as the ionic radius of the metal increases.

Answer 1

The Correct Option is A

In general, the decomposition temperature of a metal carbonate increases with the size of the metal ion. The trend of decomposition temperature for carbonates is: \[ \text{MgCO}_3<\text{CaCO}_3<\text{BaCO}_3 \] Thus, the correct order is: \[ Y<Z<X \]