10 mL of 2 M NaOH solution is added to 20 mL of 1 M HCl solution kept in a beaker. Now, 10 mL of this mixture is poured into a volumetric flask of 100 mL containing 2 moles of HCl and made the volume upto the mark with distilled water. The solution in this flask is :
- (A)0.2 M NaCl solution
- (B)20 M HCl solution✓ Correct
- (C)10 M HCl solution
- (D)Neutral solution
Answer: (B)
Solution
First, 10 mL of 2 M NaOH (0.02 mol) reacts with 20 mL of 1 M HCl (0.02 mol) completely: . The resulting 30 mL solution is neutral. When 10 mL of this neutral solution is added to a flask already containing 2 moles of HCl and diluted to 100 mL, the molarity of HCl in the final solution is M.
JEE Main · 2025 · 03 Apr 2025 · Shift 2 · Single correct option