Questions
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 separate out. Identify the colour of these crystals.
detailed solution
Correct option is D
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 crystalsTalk to our academic expert!
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Borax is used as a cleansing agent because on dissolving in water, it gives:
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