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TSP সারের রাসায়নিক সংকেত-

{(N H_{4})}_{2} S O_{4}

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

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

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

ANS : 4

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