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Q.

What is the action of heat on magnesium carbonate ?

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a

It decomposes to give metal oxide and Carbon dioxide

b

It doesnt melt

c

None of the above

d

It melts

answer is B.

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Detailed Solution

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When heated on the spatula, carbonate salts break down and give solid Magnesium Oxide and Carbon dioxide gas is liberated. Most reactive metal salts (example-NaCl) don't decompose, but middle reactive metal salts decompose to provide new products.

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