Indicate the correct statement(s) from below;

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K₂S₂O₈ when heated with K₂CrO₄ and conc. H₂SO₄ and in the presence of diethyl ether gives a
blue colouration

Presence of iodine in a sample of table salt can be tested by adding a few drops of H₂SO₄ on a
given amount of table salt followed by addition of a few drops of H₂O₂ into the resulting mixture

H₂O₂ needs to be mixed with FeSO4 to oxidise benzene to phenol

Poly hydroxy compounds like sorbitol, mannitol ets are used in trace amounts to stabilise H₂O₂

answer is B, A, C, D.

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Detailed Solution

1) K₂S₂O₈ when heated with K₂CrO₄ and conc.H₂SO₄ and in the presence of diethyl ether gives a blue colouration
2) Presence of iodine in a sample of table salt can be tested by adding a few drops of H₂SO₄ on a given amount of table salt followed by addition of a few drops of H₂O₂ into the resulting mixture
3) H₂O₂ needs to be mixed with FeSO₄ to oxidise benzene to phenol
4) Poly hydroxy compounds like sorbitol, mannitol ets are used in trace amount to stabilise H₂O₂