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Question

Orthoboric acid when heated to red hot gives:

A
Metaboric acid
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B
Pyroboric acid
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C
Boron and water
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D
Boric oxide
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Solution

The correct option is D Boric oxide
Orthoboric acid, H3BO3 is a white crystalline solid, with soapy touch. It is sparingly soluble in water but highly soluble in hot water.
On heating, orthoboric acid above 370 K forms metaboric acid, HBO2 which on further heating yields boric oxide, B2O3.
H3BO3100CHBO2ΔB2O3
Hence correct option is d.

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