Which of the following salt of calcium is used in the preparation of superphosphate of lime?

{C a}_{3} {({P O}_{3})}_{2}

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{C a}_{3} {({P O}_{4})}_{2}

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C a {({H P O}_{4})}_{2}

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C a {S O}_{4}

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Solution

The correct option is B ${C a}_{3} {({P O}_{4})}_{2}$
The mixture of calcium dihydrogen phosphate and calcium sulfate (gypsum) is called superphosphate of lime, and it contains a higher percentage of phosphorus than does calcium phosphate, $C a_{3} (P O_{4})_{2}$ . Moreover, it contains the phosphate in a soluble form, $C a (H_{2} P O_{4})_{2}$ .
Hence option B is correct answer.

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