1.

Which of the following statement is are true for Borax ?

Answer»

It forms a basic SOLUTION in water
When concentrated `H_2SO_4` is added to hot concentrated solution of `Na_2B_4O_7`, white crystals SEPARATES out
It can react with NaOH
It swells up on heating to give a GLASSY bead CONTAINING `Na_2B_4O_7` and `B_2O_3` only

Solution :`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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