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When potassium dichromate is heated to a...

When potassium dichromate is heated to a white heat, it decomposes to give pottassium chromate, chromic oxide and oxygen gas. The number of moles of oxygen gas liberated in the decomposi- tion process are

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The correct Answer is:
3
`4K_2Cr_2O_3 overset(671k^@)rarr 4K_4CrO_4 + 2CrO_3 + 3O_2`
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