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# Which of the following does not give metal oxide on heating

$\begin{array}{1 1}(a)\;MgCO_3&(b)\;Li_2CO_3\\(c)\;K_2CO_3&(d)\;ZnCO_3\end{array}$

1A group metal carbonites thermal stability increases down the group.
$K_2CO_3$
Hence (c) is the correct answer.