Which of the following are used as fertilizers?

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

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C a (H_{2} P O_{4})_{2}

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C a N C N

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C a C_{2}

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Solution

The correct options are
B $C a N C N$
C $C a (H_{2} P O_{4})_{2}$
'Superphosphate' fertilisers contain calcium dihydrogenphosphate $C a (H_{2} P O_{4})_{2}$ .
This compound is one of the world's most important ferilisers.
Also CaNCN is an important fertiliser.

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Calcium Cyanamide - CaNCN, which is produced by the Nitrogen fixation reaction of heating $C a C_{2}$ and $N_{2}$ is black in colour.

N a H C O_{3}

N a A l (S O_{4})_{2}

C a (H_{2} P O_{4})_{2}

Which of the following salt is not used as a fertilizer?

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