There are four pairs of compounds give. Separately, each compound is subjected to pyrolysis (or heated). Based on the tendency to undergo pyrolysis, which of the following pairs can be distinguished. The distinction shall be solely based on the ability to undergo pyrolysis.

$N a_{2} C O_{3}$ and $C a C O_{3}$

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$K_{2} C O_{3}$ and $M g C O_{3}$

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$C a (N O_{3})_{2}$ and $N a N O_{3}$

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$M g C l_{2} .6 H_{2} O$ and $C a C l_{2} . 6 H_{2} O$

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Solution

The correct options are
A
$N a_{2} C O_{3}$ and $C a C O_{3}$

B
$K_{2} C O_{3}$ and $M g C O_{3}$

$N a_{2} C O_{3} Δ - \to$ No reaction

$C a C O_{3} Δ - \to C a O + C O_{2}$

$K_{2} C O_{3} Δ - \to$ No reaction

$M g C O_{3} Δ - \to M g O + C O_{2}$

$C a (N O_{3})_{2} Δ - \to C a O + 2 N O_{2} + \frac{1}{2} O_{2}$

$N a N O_{3} Δ - \to N a N O_{2} + \frac{1}{2} O_{2}$

$M g C l_{2} . 6 H_{2} O Δ - \to M g (O H) C l + H C l + 5 H_{2} O$

$C a C l_{2} . 6 H_{2} O Δ - \to C a C l_{2} + 6 H_{2} O$

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