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InterviewSolution
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The coagulation of `100mL` of a colloidal solution of gold is completely prevented by adding `0.25g` of starch to it before adding `10mL` of `10%NaCl` solution. The gold number of starch is |
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Answer» Correct Answer - B [10 ml of `10%` NaCI solution is added to 100 ml of solution of gold. thus, 1 ml of 10% NaCI solution has been added to 10 ml solution of gold. Since, 100 ml gold solution required `=0.25g` starch `=0.25xx10^(3)` mg starch so, 10 ml gold solution required `=(0.25xx10^(3))/(100)xx10` Thus, by definition, the gold number of starch is `25`.] |
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