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High percentage of carbon is found in an...

High percentage of carbon is found in anthracite.

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The correct Answer is:
A,B,C
`Na_2B_4O_7`+water`to NaBO_2 + H_3BO_3`
Hydrolysis of `NaBO_2` make solution basic.
The `H_3BO_3` can react with NaOH.
It swells up on heating to give a glassy bead containing `NaBO_2 and B_2O_3`.
`H_2SO_4+Na_2B_4O_7toNa_2SO_4+H_3BO_3`(white crystals)
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