Question

Two bottles A and B contains 1 M and 1 m aqueous solution of sulphuric acid respectively

• A. A is more concentrated than B
• B. B is more concentrated than A
• C. concentration of A is equal to concentration of B
• D. it is not possible to compare the concentrations

Answer 1

Answer: (A)

$1M{H}_{2}S{O}_4$ means 1 mole $H_{2}S{O}_4$ in 1000 cc of solution whereas 1 m means 1 mole $H_{2}S{O}_4$ in 1000 g of water (=1000 cc of water). Total volume of 1 m solution will be > 1000 cc due to extra 1 mole $H_{2}S{O}_4$ . Hence, number of moles per 1000 cc will be less than 1 mole. Thus, 1 m is less concentrated than 1M.