Question

pH is less than 7 for which aqueous solution?
0.1 M NaCl
0.1 M CH3COONa
0.1 M NH4Cl
0.1 M NaOH​

Answer 1

ANSWER ---- 3rd option NH4CI

Answer 2

Question : pH is less than 7 for which aqueous solution?

1. 0.1 M NaCl
2. 0.1 M CH3COONa
3. 01. M NH4Cl
4. 0.1 M NaOH

solution : we know, pH of acidic solution is less than 7 and pH of basic solution is greater than 7 but less than 14.

let's check all options.

option (1), NaCl

NaCl is formed by strong acid (HCl) and strong base (NaOH) so it is neutral salt. it's pH = 7

option (2), CH3COONa

CH3COONa is formed by weak acid (CH3COOH) and strong base (NaOH) so salt CH3COONa is basic in nature so its pH must be greater than 7.

option (3), NH4Cl

it is formed by weak base and strong acid so it is acidic in nature. so the pH of NH4Cl is less than 7.

option (4), NaOH,

it is strong base so pH must be greater than 7.

Therefore correct option is (3) 0.1 M NH4Cl.