Q.

Number of species given below, which can coagulate the heamoglobin sol.
Clay sol,  As2S3 sol, Fe(OH)3 sol, starch sol, Al3+ , PO43 , Basic dye ,CdS sol.
 

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answer is 5.

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Detailed Solution

Clay sol,  As2S3 sol,  PO43 are negatively charged so they can coagulate positively charged sol 

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Number of species given below, which can coagulate the heamoglobin sol.Clay sol,  As2S3 sol, Fe(OH)3 sol, starch sol, Al3+ , PO43− , Basic dye ,CdS sol.