Question

Match the following

The correct answer is

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

Hint:

Remember: Calgon \(\rightarrow Na_6(PO_3)_6\) Clark's method \(\rightarrow Ca(OH)_2\) Zeolite method \(\rightarrow NaAlSiO_4\) Synthetic resin \(\rightarrow RSO_3H\)

Answer 1

The Correct Option is B

Concept: Different methods are used for removing hardness of water. Each method employs a specific chemical reagent for removing calcium and magnesium ions responsible for hardness.

Step 1: Identify the chemical used in Calgon method.
Calgon is sodium hexametaphosphate: \[ Na_6(PO_3)_6 \] Hence, \[ A \rightarrow IV \]

Step 2: Identify the chemical used in Clark's method.
Clark's method removes temporary hardness using lime. \[ Ca(OH)_2 \] Therefore, \[ C \rightarrow II \]

Step 3: Identify the ion exchange method.
Ion exchange method uses zeolite. \[ NaAlSiO_4 \] Hence, \[ B \rightarrow III \]

Step 4: Identify the synthetic resin method.
Synthetic resin softeners contain acidic groups represented as \[ RSO_3H \] Thus, \[ D \rightarrow I \] Therefore, \[ A-IV,\quad B-III,\quad C-II,\quad D-I \] \[ \boxed{\text{Option (B)}} \]