MCQ
The hydrogen ion concentration of a $0.006\,M$ benzoic acid solution is $({K_a} = 6 \times {10^{ - 5}})$
- A$0.6 \times {10^{ - 4}}$
- ✓$6 \times {10^{ - 4}}$
- C$6 \times {10^{ - 5}}$
- D$3.6 \times {10^{ - 4}}$
$\mathop {\mathop {{C_6}{H_5}COOH}\limits_C }\limits_{C(1 - a)\,\,\,} $$ \rightleftharpoons $$\mathop {\mathop {{C_6}{H_5}CO{O^ - }}\limits_O }\limits_{Ca} + \mathop {\mathop {{H^ + }\,\,\,\,\,\,\,}\limits_{O\,\,{\rm{initial}}} }\limits_{Ca\,\,\,\,\,\,\,\,\,\,\,\,\,\,} $
${K_a} = C{\alpha ^2}$ for weak electrolyte
$\alpha = \sqrt {\frac{{{K_a}}}{C}} $; $\alpha = \sqrt {\frac{{6 \times {{10}^{ - 5}}}}{{0.006}}} $; $\alpha = {10^{ - 1}}$
$ = 0.006 \times {10^{ - 1}}$$ = 6 \times {10^{ - 4}}\,M$.
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| List $I$ | List $II$ |
| $P$. $\quad \underset{X}{\left( C _2 H _5\right)_3 N }+\underset{ Y }{ CH _3 COOH }$ | $1.$ Conductivity decreases and then increases |
| $Q.$ $\quad \underset{X}{ KI (0.1 M )}+\underset{ Y }{ AgNO _3(0.01 M )}$ | $2.$ Conductivity decreases and then does not change much |
| $R.$ $\quad \underset{X}{ CH _3 COOH }+\underset{ K }{ KOH }$ | $3.$ Conductivity increases and then does not change much |
| $S$. $\quad \underset{X}{ NaOH }+\underset{Y}{ HI }$ | $4.$ Conductivity does not change much and then increases |
Codes: $ \quad P \quad Q \quad R \quad S $