Byju's Answer

Standard XII

Physics

Resistance of P-N Junction

The gold numb...

Question

The gold number of gelatin is $0.01$ . Calculate the amount of gelatin to be added to $1000$ mL of a colloidal sol of gold to prevent its coagulation before adding $1$ mL of $10 %$ $N a C l$ solution.

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Solution

The correct option is C $1$
Gold number of gelatin $= 0.01$ .
This means that $0.01$ mg gelatin is required to be added to $10$ mL of gold sol to completely prevent coagulation of $1$ mL of $10 %$ $N a C l$ solution.
Therefore, gelatine added to $1000$ mL of gold sol to prevent coagulation $= \frac{0.01 \times 1000}{10} = 1$ mg.

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The correct option is C 1Gold number of gelatin =0.01.This means that 0.01 mg gelatin is required to be added to 10 mL of gold sol to completely prevent coagulation of 1 mL of 10% NaCl solution.Therefore, gelatine added to 1000 mL of gold sol to prevent coagulation =0.01×100010=1 mg.

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