Electrolysis

Step 1: Understanding the Reaction.
We are asked to find the correct relation for . This involves understanding the properties of different solutions and their effects on the system.
Step 2: Analyzing the Options.
- (A) is the correct relation. This shows the interaction between water, sodium hydroxide, and sodium chloride.
- (B) Involves an acid-base reaction, but it is not the right relation for .
- (C) Involves a different set of acids and bases but doesn't match the required relation.
- (D) Involves ammonium chloride and ammonium hydroxide, which is also not the correct relation.
Step 3: Conclusion.
The correct answer is (A) .

Step 1: Understanding the Calculation.
The weight/volume percentage is calculated using the formula:
Step 2: Calculation.
- The concentration is 1.2% W/V NaCl, so for every 100 mL of solution, we have 1.2 grams of NaCl. - Therefore, the correct answer is (B) 1.2% W/V NaCl.