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Question

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:


A
0.025
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B
0.25
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C
2.5
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D
none of these
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Solution

The correct option is D none of these
$$0.25gm$$ 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 $$\Rightarrow$$ none of these.

Chemistry

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