JEE Main levelSingle correct optionDifficulty 2 of 3sb190
0.30 mol of NaOH and 0.20 mol of NaHCOX3 are dissolved together in water. Sodium-containing species in the final solution (apart from NaX+ counted as spectator) are
A0.10 mol NaX2COX3 and 0.20 mol NaOH
B0.20 mol NaX2COX3 and 0.10 mol NaOH
C0.30 mol NaX2COX3 and 0.20 mol NaHCOX3
D0.20 mol NaX2COX3 and 0.10 mol NaHCOX3
Answer: B
NaOH+NaHCOX3NaX2COX3+HX2O is 1 : 1. All 0.20 mol of NaHCOX3 reacts with 0.20 mol NaOH, giving 0.20 mol NaX2COX3 and leaving 0.30−0.20=0.10 mol NaOH.