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Standard XII

Chemistry

Applications of Colloids

The coagulati...

Question

The coagulation of $10 {cm}^{3}$ of Gold sol by $1 mL$ $10 %$ $N a C l$ solution is completely prevented by addition of $0.25 g$ of starch to it. The gold number of starch is:

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Solution

$0.25 g$ prevents coagulation of $10 mL$ of gold sol by $1 mL$ of $10 % N a C l$
∴ milligarms of starch $= 250$
∴ Gold number $= 250$

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The coagulation of 10 cm3 of Gold sol by 1 mL 10% NaCl solution is completely prevented by addition of 0.25 g of starch to it. The gold number of starch is:

0.25 g prevents coagulation of 10 mL of gold sol by 1 mL of 10% NaCl ∴ milligarms of starch =250 ∴ Gold number =250

The coagulation of $10 {cm}^{3}$ of Gold sol by $1 mL$ $10 %$ $N a C l$ solution is completely prevented by addition of $0.25 g$ of starch to it. The gold number of starch is:

$0.25 g$ prevents coagulation of $10 mL$ of gold sol by $1 mL$ of $10 % N a C l$
∴ milligarms of starch $= 250$
∴ Gold number $= 250$