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What is the percentage of P2O5 present in triple super phosphate?

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What is the percentage of P2O5  present in triple super phosphate?

(a) 16-20%

(b) 42-50%

(c) 30-35%

(d) 62-70%

The question was asked during an online interview.

This intriguing question originated from Inorganic Chemical in chapter Inorganic Chemical Industries of Chemical Technology

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Right option is (b) 42-50%

To explain I would say: Super phosphate contains 16-20%  P2O5 whereas triple super phosphate contains 42-50%  P2O5. These are 2 distinct grades of calcium phosphate.

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