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Balancing Chemical Equations by Partial Equation Method

A white cryst...

Question

A white crystalline solid $A$ on dissolving in water forms a neutral solution. When solid $A$ is heated with calcium hydroxide, it gives off colourless gas $B$ having a sharp biting smell. The gas fumes very strongly in the air and turns red litmus blue. The aqueous solution of $A$ on treating with lead acetate solution forms a white precipitate $C$ . The precipitate is insoluble in all acids.
i) Name the anion present in solid $A$ .
ii) Name the solid $A$ and write its chemical formula.
iii) Name the white precipitate $C$ .
iv) Write one chemical test for the identification of gas $B$ .
v) Name the colourless gas $B$ .

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Solution

$∴$ $B$ is basic, it turns red to blue litmus.
$P b (O A C)_{2} N H_{4} C l - --- \to H_{2} O P b C l_{2} (C) W h i t e p p t . ↓ + N H_{4}^{+} A C O^{-}$
Test for $N H_{3} / N H_{4}^{+}$ (Nessler Test)
$K_{2} [H g I_{4}] + N H_{4}^{+} O H^{-} - -- \to$ (Millon's base)
(brown ppt.)

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Q. Identify the substances P, Q, and R in each case based on the information given below:
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(ii) The white crystalline solid Q is soluble in water. It liberates a pungent smelling gas when heated with sodium hydroxide solution.
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Q. Colourless solid (A)

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