i) A white solid mixture of two salts (A) containing a common cation is insoluble in water. It dissolves in dilute HCl producing some gases (with effervescence) that turn an acidified dichromate solution green. After the gases are passed through the acidified dichromate solution, the emerging gas turns baryta water milky.
ii) On treatment with dilute $H N O_{3}$ , the white solid mixture (A) gives a solution which does not directly give a precipitate with a $B a C l_{2}$ solution but the white solid mixture (A) gives a white precipitate when warmed with $H_{2} O_{2}$ and then treated with a $B a C l_{2}$ solution.
iii) The solution of the mixture in dilute $H C l$ , when treated with $N H_{4} C l, N H_{4} O H$ and $N a_{2} H P O_{4}$ solution gives a white precipitate.
Which of the following statements are correct regarding the above tests?

Question

Infinity Learn · Accepted Answer

The white precipitate obtained in (ii) indicates the presence of sulphite

,

The white precipitate obtained in (iii) consists of $M g N H_{4} P O_{4} .6 H_{2} O$

Detailed Solution