An inorganic compound which on heating first melts, then solidifies and liberates a gas, is :
A
Al2O3
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B
KMnO4
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C
MnO2
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D
KClO3
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Solution
The correct option is DKClO3 2KClO3solidmelts−−−→heat2KClsolid+3O2
The solid product that results from the thermal decomposition of KClO3 is KCl. The contents of the test tube will solidify, since the melting point of the product (KCl) is greater than that of KClO3. And the gas evolved is O2.