Indicate the correct statement(s) from below :

Options

A. `K_2S_2O_8` when heated with `K_2CrO_4` and conc. `H_2SO_4` and in the presence of diethyl ether gives a blue colouration
B. Presence of iodine in a sample of table salt can be tested by adding a few drops of `H_2SO_4` on a gives amount of table salt followed by addition of a few drops of `H_2O_2` into the resulting mixture
C. `H_2O_2` needs to be mixed with `FeSO_4` to oxidise benzene to phenol
D. Poly hydroxy compounds like sorbital, like sorbitol, mannitol ets are used in trace amounts to stabilise `H_2O_2`

Answer

A, B, C, D

Explanation

(1) `K_2S_2O_8` when heated with `K_2CrO_4` and conc. `H_2SO_4` 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 `H_2SO_4 ` on a given amount of table salt followed by addition of a few drops of `H_2O_2` into the resulting mixture
(3) `H_2O_2` needs to be mixed with `FeSO_4` to oxidise benzene to phenol
(4) Poly hydroxy compounds like sorbital, mannitol ets are used in trace ammount to stabilise `H_2O_2`