Write balanced equations to satisfy each statement.
Acid + Sulphite or
bisulphite $\to$ Salt + Water
+ Sulphur dioxide

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Solution

When acid reacts with sulphite $({S O}_{3}^{2 -})$ or bisulphite $({H S O}_{3}^{-})$ group they produce salt, water and sulphur dioxide gas.
When calcium sulphite reacts with hydrochloric acid, calcium chloride salt, water and sulphur dioxide gas are produced. The balanced chemical equation can be given as, ${C a S O}_{3} + H C l \to {C a C l}_{2} + H_{2} O + {S O}_{2}$

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Write balanced equations to satisfy each statement.

(a) Acid + Active metal $\to$ Salt + Hydrogen

(b) Acid + Base $\to$ Salt + Water

or bicarbonate

(d) Acid + Sulphite or bisulphite $\to$ Salt + Water + Sulphur dioxide

(e) Acid + Sulphide $\to$ Salt + Hydrogen Sulphide

(i) Name the catalyst which helps in the conversion of sulphur dioxide to sulphur trioxide in step C.
(ii) In the contact process for the manufacture of sulphuric acid, sulphur trioxide is not converted to sulphuric acid by reacting it with water. Instead a two-step procedure is used. Write the equations for the two step involved in D.
(iii) What type of substance will liberate sulphur dioxide from sodium sulphite in step E?
(iv) Write the equation for the reaction by which sulphur dioxide is converted to sodium sulphite in step F?