A metallic oxide which on heating gives a metal and oxygen is:

S O_{2}

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H g O

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N a_{2} O

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F e_{2} O_{3} . x H_{2} O

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Solution

The correct option is B $H g O$
$H g O$ on heating gives mercury and oxygen separately. It decomposes to different elements.

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N a_{2} O, A l_{2} O_{3}, P b O, A g_{2} O, H g O

S O_{3}

S O_{2} + \frac{1}{2} O_{2}

A metal which gives amphoteric oxide on reaction with oxygen gas is

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