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Calcination

Which of the ...

Question

Which of the following represents the preparation of superphosphate of lime from fluoroapatite?

C a_{3} (P O_{4})_{2} + C a F_{2} + 6 H_{2} P O_{4} \to 4 C a (H_{2} P O_{4})_{2}^{'} + 2 H F ↑

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C a_{3} (P O_{4})_{2}^{'} + C a F_{2} + 4 H_{2} S O_{4} \to 4 C a S O_{4} + 2 H_{3} P O_{4} + 2 H F ↑

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3 [C a_{3} (P O_{4})_{2}^{'} + C a F_{2}] + 7 H_{2} S O_{4} \to 3 C a (H_{2} P O_{4})_{2} + 7 C a S O_{4} + 2 H F ↑

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C a_{3} (P O_{4})_{2} + 3 H_{3} P O_{4} \to 3 C a (H P O_{4})_{2}

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Solution

The correct option is C $3 [C a_{3} (P O_{4})_{2}^{'} + C a F_{2}] + 7 H_{2} S O_{4} \to 3 C a (H_{2} P O_{4})_{2} + 7 C a S O_{4} + 2 H F ↑$
Superphosphate of lime is prepared by treating phosphate rock or fluorapatite or bone ash with calculated quantity of conc. $H_{2} S O_{4}$ .
$3 [C a_{3} (P O_{4})_{2}^{'} + C a F_{2}] + 7 H_{2} S O_{4} \to 3 C a (H_{2} P O_{4})_{2} + 7 C a S O_{4} + 2 H F ↑$

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Similar questions

C a^{2 +}

C a_{3} (P O_{4})_{2}

3 C a_{3} (P O_{4}) . C a F_{2}

C a_{3} (P O_{4})_{2}

H C l

C a_{3} (P O_{4})_{2} + 6 H C l \to 3 C a C l_{2} + 2 H_{3} P O_{4}

C a C l_{2}

\frac{1}{x}

x

X e F_{6} + H_{2} O

\to

+ 2 H F

X e F_{6} + H_{2} O ⇌ X e O F_{4} + 2 H F

= k_{1}, X e O_{4} + X e F_{6} ⇌ X e O F_{4} + X e O_{3} F_{2}

= K_{2}

X e O_{4} + 2 H F ⇌ X e O_{3} F_{2} + H_{2} O

X e F_{6} + H_{2} O ⇌ X e O F_{4} + 2 H F

= K_{1}, X e O_{4} + X e F_{6} ⇌ X e O F_{4} + X e O_{3} F_{2}

= K_{2}

- X e O_{4} + 2 H F ⇌ X e O_{4} F_{2} + H_{2} O

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