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A certain salt (X) gives the following t...

A certain salt `(X)` gives the following tests :
(a) Its aqueous solution is alkaline to litmus.
(b) On strong heating, it swells up to give a glassy material `(Y)`.
(c) When conc. `H_(2) SO_(4)` is added to a hot concentrated solution of `(X)`, white crystal of a weak acid `(Z)` separates out.
Identify `(X), (Y) and (Z)` and write down the chemical equations for reaction at steps `a, b` and `c`.

Text Solution

Verified by Experts

The correct Answer is:
A, B, C, D
(i)`Na_(2)B_(4)O_(7)+2H_(2)Oto4H_(3)BO_(3)+2NaOH`(due to `NaoH`)
(ii)`Na_(2)B_(4)O_(7)overset(740^(@)C)to ubrace(2NaBO_(2)+B_(2)O_(3))_("glassy material")`
(iii)`Na_(2)B_(4)O_(7)+5H_(2)O+H_(2)SO_(4)toNa_(2)SO_(4)+4H_(3)BO_(3)`
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