X is a protecting colloid. The following data | vedclass

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(D) The gold number is defined as the minimum weight of a protective colloid in milligrams that must be added to $10 \ mL$ of a standard gold sol to p

Vedclass · Accepted Answer

$25$

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(D) The gold number is defined as the minimum weight of a protective colloid in milligrams that must be added to $10 \ mL$ of a standard gold sol to prevent its coagulation when $1 \ mL$ of a $10 \% NaCl$ solution is added.From the given table,we observe the weights of $X$ added:- At $23 \ mg$ and $24 \ mg$,coagulation is not prevented.- At $25 \ mg$,$26 \ mg$,and $27 \ mg$,coagulation is prevented.The minimum weight of $X$ required to prevent coagulation is $25 \ mg$.Therefore,the gold number of $X$ is $25$.

Expt. No.	Weight of $X$ (in $mg$) added to gold sol	Coagulation
$1$	$24$	Not prevented
$2$	$23$	Not prevented
$3$	$26$	prevented
$4$	$27$	prevented
$5$	$25$	prevented

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