Question

If active mass of a $6\%$ solution of a compound is $2$, its molecular weight will be

• A. 30
• B. 15
• C. 60
• D. 22

Answer 1

Answer: (A)

30

Answer 2

Given: Percentage of solution $= 6$ and active mass of the compound $=2=2 \,M$ solution or $2\, moles /$ litre. Since $100 \,ml$ solution contains $6 \,g$, therefore $1000\, ml$ solution contains $=\frac{6 \times 1000}{100}=60 \,g$, therefore molecular weight of the compound $=\frac{60}{2}=30$