Question

Which of the following has highest equivalent weight? (Given: At.wt $H=1, C=12, O=16, S=32, Na=23, Ca=40$)

• A. Sulphuric acid
• B. Sodium carbonate
• C. Sodium sulphate
• D. Calcium carbonate

Hint:

Always divide the molecular weight by the total positive/negative charge for salts to find equivalent weight.

Answer 1

The Correct Option is C

Step 1: Concept
Equivalent weight = Molecular weight n-factor (valency/basicity/acidity).

Step 2: Meaning
Calculate Molecular Weights (MW) and n-factors for each: (A) $H_{2}SO_{4}$: MW=98, n=2 $\to$ Eq.wt=49. (B) $Na_{2}CO_{3}$: MW=106, n=2 $\to$ Eq.wt=53. (C) $Na_{2}SO_{4}$: MW=142, n=2 $\to$ Eq.wt=71. (D) $CaCO_{3}$: MW=100, n=2 $\to$ Eq.wt=50.

Step 3: Analysis
Comparing the calculated equivalent weights: 49, 53, 71, and 50.

Step 4: Conclusion
Sodium sulphate has the highest equivalent weight at 71.
Final Answer: (C)