Which of the following statements is/ are incorrect?

Moderate

A

A filter paper moistened with cadmium acetate solution turns yellow, when brought in content with $H_{2} S$ gas.
B

Both carbonate ions as well as bicarbonate ions in the solutions, give reddish-brown precipitate with mercury(II) chloride.
C

Sulphites in presence of zinc, reacts with dilute $H_{2} {SO}_{4}$ to liberate ${SO}_{3}$ gas.
D

A filter paper moistened with $K I O_{3}$ and starchturns blue in contact with $S O_{2}$ vapours.

Solution

2) $C O_{3}^{2 -} + 4 H g^{2 +} + 3 H_{2} O \overset{}{\to} \underset{(Reddish brown)}{3 H g O \cdot H g C O_{3} ↓}$
$H C O_{3}^{-}$ do not form ppt.
3) $H_{2} S$ gas is evolved.

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