The balanced chemical reaction for the manufacturing of superphosphate is:

C a_{3} (P O_{4})_{2} + 2 H_{2} S O_{4} + 4 H_{2} O ⟶ C a (H_{2} P O_{4})_{2} + 2 C a S O_{4} .2 H_{2} O

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C a_{3} (P O_{4})_{2} + H_{2} S O_{4} + 4 H_{2} O ⟶ C a (H_{2} P O_{4})_{2} + C a S O_{4} .2 H_{2} O

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C a_{3} (P O_{4})_{2} + 2 H_{2} S O_{4} + 2 H_{2} O ⟶ 2 C a (H_{2} P O_{4})_{2} + C a S O_{4} .2 H_{2} O

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C a_{3} (P O_{4})_{2} + 4 H_{2} S O_{4} + 2 H_{2} O ⟶ C a (H_{2} P O_{4})_{2} + 2 C a S O_{4} .2 H_{2} O

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Solution

The correct option is A $C a_{3} (P O_{4})_{2} + 2 H_{2} S O_{4} + 4 H_{2} O ⟶ C a (H_{2} P O_{4})_{2} + 2 C a S O_{4} .2 H_{2} O$
A well powdered phosphate rock or bone ash mixed known quantity of concentrate sulphuric acid is introduced into a cast iron chamber provided with mechanical stirrer and two valves at bottom. Each valve opens in a big chamber called den. The mixture is stirred for 2 to 5 minutes and then dumped mechanically into one of the dens through the valve. The mass is kept in the den for about 24 hours.
${C a}_{3} {(P O_{4})}_{2} + 2 H_{2} S O_{4} + 4 H_{2} O ⟶ C a {(H_{2} P O_{4})}_{2} + 2 C a S O_{4} .2 H_{2} O + H e a t$

A mixture of calcium sulphate and calcium dihydrogen phosphate is obtained .This mixture is called superphosphate.

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