Give a short account of the heating effect on metal carbonates based on the activity series. [5 MARKS]

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Solution

Entire explanation with equations: 5 Marks

Effect of heat on metal carbonates : The carbonates of highly reactive metals like Na, K etc. which lie near the top of activity series are stable to heat.
The carbonates of Ca, Mg, Al etc., decompose on heating to give metal oxide and carbon dioxide.
$M g C O_{3} Δ - \to M g O + C O_{2}$
$C a C O_{3} Δ - \to C a O + C O_{2}$
The carbonates of Zn, Cu also decompose on heating to give metal oxide and carbon dioxide.
$Z n C O_{3} Δ - \to Z n O + C O_{2}$
$C u C O_{3} Δ - \to C u O + C O_{2}$
The metal carbonates lying near the bottom of series decompose on heating, giving metal, oxygen and carbon dioxide. For example
$2 A g_{2} C O_{3} Δ - \to 4 A g + O_{2} + 2 C O_{2}$

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