Which of the following solutions have the same molar concentration ?

Options

A. 20 g of NaOH in 200 mL of solution
B. 0.5 mol of KCl in 200 mL of solution
C. 40 g of NaOH in 100 mL of solution
D. 20 g of KOH in 200 mL of solution

Answer

A, B

Explanation

(a) `"Molar concentration of NaOH solution "=("20/40 mole")/("0.200 L")=2.5M`
(b) `"Molar conc. of KCl solution"=("0.5 mole")/("0.200 L")=2.5M`
(c) `"Molar conc."=("40/40 mole")/("0.100 L")=10M`
(d) `"Molar conc."=("20/56 mole")/(0.200 L")=1.78M`
Thus, (a) and (b) have the same molar concentration.