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Question

A certain salt X gives the following test :
(i) Its aqueous solution is alkaline to litmus.
(ii) On strongly heating, it swells to give glassy bead.
(iii) When concentrated H2SO4 is added to a solution of X white crystals of a weak acid. separate out.

Identify X and write down all reaction.

A
NaHCO3
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B
Na2B4O7.10H2O
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C
CaSO4.2H2O
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D
CaCO3
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Solution

The correct option is B Na2B4O7.10H2O
X is Na2B4O7.10H2O
(i) Na2B4O7+7H2O2NaOH+4H3BO3
Due to presence of NaOH the aqueous solution is alkaline to litmus.
(ii) Na2B4O7.10H2ΔNa2B4O7(2NaBO2+B2O3) (Glassy bead)
(iii) Na2B4O7+H2SO4+5H2ONa2SO4+4H3BO3 (white crystalline weak acid)

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