Q.

A certain salt (X) gives the following tests(i) Its aqueous solution is alkaline to litmus.(ii) On strongly heating it swells to give a glassy bead.(iii) When concentrated sulphuric acid is added to a hot concentrated solution of (X), crystals of H3BO3 separate out. Identify the colour of these crystals.

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Violet

Blue

Brown

White

answer is D.

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Detailed Solution

X is borax, Na2B4O7.10H2O (i) Na2B4O7 + 7H2O ⇌ 2NaOH(Strong Base) + 4H3BO3(Weak acid)Due to presence of NaOH, the aqueous solution is alkaline to litmus.(ii) Na2B4O7.10H2O →swellsHeat Na2B4O7 + 10H2O → 2NaBO2 + B2O3Glassy bead (iii) Na2B4O7 + H2SO4 + 5H2O → Na2SO4 + 4H3BO3White crystals

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