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(B) According to the guidelines for drinking water quality (as per $NCERT$ Chemistry textbook,Environmental Chemistry chapter),the maximum prescribed

Vedclass · Accepted Answer

$5.0 \ mg \ dm^{-3}$

Vedclass · Answer

(B) According to the guidelines for drinking water quality (as per $NCERT$ Chemistry textbook,Environmental Chemistry chapter),the maximum prescribed concentration of copper $(Cu)$ is $3.0 \ mg \ dm^{-3}$.The maximum prescribed concentration of zinc $(Zn)$ is $5.0 \ mg \ dm^{-3}$.Given that the concentration of copper is $x = 3.0 \ mg \ dm^{-3}$,we need to find the concentration of zinc in terms of $x$.Since $Zn = 5.0 \ mg \ dm^{-3}$ and $Cu = 3.0 \ mg \ dm^{-3}$,the ratio is $\frac{Zn}{Cu} = \frac{5}{3}$.Therefore,$Zn = \frac{5}{3} x$ is not directly listed,but based on standard values provided in the curriculum,the correct value for zinc is $5.0 \ mg \ dm^{-3}$.

List-$I$	List-$II$
$(A)$ Lead	$(I)$ $500 \text{ ppm}$
$(B)$ Sulphate	$(II)$ $50 \text{ ppm}$
$(C)$ Nitrate	$(III)$ $50 \text{ ppb}$

In drinking water,if the maximum prescribed concentration of copper is $x \ mg \ dm^{-3}$,the maximum prescribed concentration of zinc will be

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