JEE Main202116 Mar 2021Evening ShiftChemistryRedox ReactionsActual
The exact volumes of 1 M NaOH solution required to neutralise 50 mL of 1 M H 3 PO 3 solution and 100 mL of 2 M H 3 PO 2 solution, respectively, are :
Options
- A100   mL and 100   mL
- B100   mL and 50   mL
- C100   mL and 200   mL
- D50   mL and 50   mL
Correct answer
C. 100   mL and 200   mL
Step-by-step solution
H 3 PO 3 + 2 NaOH → Na 2 HPO 3 + 2 H 2 O 50   ml 1   M 1   M    V = ? ⇒ n NaoH n H 3 PO 3 = 2 1 ⇒ 1 × V 50 × 1 = 2 1 ⇒ V NaOH = 100   ml H 3 PO 2 + NaOH → NaH 2 PO 3 + H 2 O 2 M                    1   M 100   mL               V = ? ⇒ n NaoH n H 3 PO 3 = 1 1 ⇒ 1 × V 2 × 100 = 1 1 ⇒ V NaOH = 200   ml