Question

Match the following.

\[ \begin{array}{|c|l|c|l|} \hline \text{List-I} & & \text{List-II} & \\ \hline \text{A} & \text{Cottrell precipitator} & \text{I} & \text{Antimony colloid} \\ \hline \text{B} & \text{Kalaazar} & \text{II} & \text{Curd} \\ \hline \text{C} & \text{Lactobacilli} & \text{III} & \text{Drinking water} \\ \hline \text{D} & \text{Alum} & \text{IV} & \text{Smoke} \\ \hline \end{array} \]
The correct answer is

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

Hint:

Remember the important applications: \[ \boxed{ \begin{aligned} &\text{Cottrell precipitator} \rightarrow \text{Smoke removal} &\text{Antimony colloid} \rightarrow \text{Kalaazar treatment} &\text{Lactobacilli} \rightarrow \text{Curd formation} &\text{Alum} \rightarrow \text{Purification of drinking water} \end{aligned} } \]

Answer 1

The Correct Option is D

Step 1: Match each item. \[ \begin{aligned} \text{Cottrell precipitator} &\rightarrow \text{Smoke} \text{Kalaazar} &\rightarrow \text{Antimony colloid} \text{Lactobacilli} &\rightarrow \text{Curd} \text{Alum} &\rightarrow \text{Drinking water} \end{aligned} \] Hence, \[ \boxed{ A\!-\!IV,\; B\!-\!I,\; C\!-\!II,\; D\!-\!III } \] Therefore, \[ \boxed{(D)} \] is the correct answer.