On addition of one mL of $10 %$ $N a C l$ solution to $10$ mL gold sol in the presence of $0.25$ g of starch, the coagulation is just prevented. Starch has gold number:

0.025

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0.25

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2.5

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none of these

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Solution

The correct option is D none of these
$0.25 g m$ of starch needed to prevent coagulation of $10$ % $N a C l$ to $10 m l$ gold.sol.

Amount of starch $= 0.25 g m = 250 m g$ .

So, the gold number of starch is $250$ .

So, Option-D $\Rightarrow$ none of these.

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[MP PET/PMT 1988]

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On addition of one mL of 10% NaCl solution to 10 mL gold sol in the presence of 0.25 g of starch, the coagulation is just prevented. Starch has gold number:

The correct option is D none of these0.25gm of starch needed to prevent coagulation of 10% NaCl to 10ml gold.sol.Amount of starch =0.25gm=250mg.So, the gold number of starch is 250.So, Option-D ⇒ none of these.

On addition of one mL of $10 %$ $N a C l$ solution to $10$ mL gold sol in the presence of $0.25$ g of starch, the coagulation is just prevented. Starch has gold number:

The correct option is D none of these
$0.25 g m$ of starch needed to prevent coagulation of $10$ % $N a C l$ to $10 m l$ gold.sol.

Amount of starch $= 0.25 g m = 250 m g$ .

So, the gold number of starch is $250$ .

So, Option-D $\Rightarrow$ none of these.