Question

Match the following:

• A. A-III, B-IV, C-II, D-I
• B. A-II, B-III, C-IV, D-I
• C. A-III, B-II, C-I, D-IV
• D. A-IV, B-III, C-II, D-I

Hint:

Cadmium is highly toxic even in trace amounts, therefore its permissible concentration in drinking water is extremely low.

Answer 1

The Correct Option is C

Concept: Different metal ions have prescribed maximum permissible concentrations in drinking water to prevent toxicity and health hazards.

Step 1: Recall the standard permissible limits.
\[ Zn = 5.0 \text{ ppm} \] \[ Cd = 0.005 \text{ ppm} \] \[ Mn = 0.05 \text{ ppm} \] \[ Cu = 3.0 \text{ ppm} \]

Step 2: Match the values.
\[ Zn \rightarrow 5.0 \rightarrow III \] \[ Cd \rightarrow 5\times10^{-3} \rightarrow II \] \[ Mn \rightarrow 5\times10^{-2} \rightarrow I \] \[ Cu \rightarrow 3.0 \rightarrow IV \] Thus, \[ A-III,\quad B-II,\quad C-I,\quad D-IV \] Hence, \[ \boxed{\text{Option (C)}} \]