Arrhenius Acid

Q. A compound $\text{X}$ is a weak acid and it exhibits colour change at $\text{pH}$ close to the equivalence point during neutralization of $\text{NaOH}$ with ${\text{CH}}_3\text{COOH}$. Compound $\text{X}$ exists in ionized form in basic medium. The compound $\text{X}$ is :

1. methyl orange
2. phenolphthalein
3. erichrome Black T
4. methyl red

Q.

Equal volumes of 10%$\frac{v}{v}$ of HCl is mixed with 10%$\frac{v}{v}$ NaOH solution. If density pure NaOH is 1.5 times that of pure HCl then the resultant solution be

1. Can't be predicted

2. Basic

3. Neutral

4. Acidic

Q.

Which of the following is the strongest acid?

1. $HClO$

2. $HCl{O}_3$

3. $HCl{O}_4$

4. $HCl{O}_2$

Q.

Nicotinic acid (Ka = 1.4 x ${10}^{-5}$) is represented by the formula HNic. For a solution which contains 0.10 mol of nicotinic acid per 2.0 litre of solution, the percent dissociation is:

1. 4.2%

2. 12.77%

3. 1.66%

4. 3.33%

Q. Sort the acids according to their strengths in the decreasing order.

1. $HCl{O}_4$
2. $HCl{O}_3$
3. $HCl{O}_2$
4. $HClO$

Q. Species that increases the concentration of $H^{+}andO{H}^{-}ions$ in aqueous solution are called :

1. Lewis acid and Lewis base
2. All of the above.
3. Bronsted-Lowry acid and Bronsted-Lowry base
4. Arrhenius acid and Arrhenius base

Q. $C{H}_{3}CO{O}^{-}$ ion is a:

1. strong conjugate acid
2. weak conjugate acid
3. weak conjugate base
4. strong conjugate base

Q. The degree of dissociation of weak electrolyte increases by :

1. increasing the concentration of weak electrolyte solution
2. adding a common ion
3. dissolution in solvent of low dielectric constant
4. adding more amount of solvent into the solution

Q. Ammonium carbamate when heated to ${200}^{0}C$ gives a mixture of ${NH}_3$ and ${CO}_2$ with a vapour density of 13. What is the degree of dissociation of ammonium carbamate?

1. $\frac{3}{2}$
2. $\frac{1}{2}$
3. $2$
4. $1$

Q. For the equilibrium $N_2{O}_4\rightleftharpoons 2N{O}_2$ in gaseous phase, $N{O}_2$ is $50\%$ of the total volume when equilibrium is set up. Hence percent of dissociation of $N_2{O}_4$ is:

1. $50\%$
2. $33.33\%$
3. $25\%$
4. $66.66\%$