M(OH) x has ${\mathrm{K}}_{\mathrm{sp}}=4\times {10}^{-12}$ and solubility 10^-4 M, x is

1. 1

2. 2

3. 3

4. 4

The pH values of 1 M solutions of CH₃COOH (I), CH₃COONa (II), CH₃COONH₄ (III), and KOH (IV) will be in the order

1. IV>III>II>I

2. IV>II>III>I

3. I>III>II>IV

4. II>I>III>IV

The ratio of the concentration of salt and acid for preparing a buffer solution of pH 6 by mixing sodium acetate and acetic acid will be: (K_a=10^-5)

1. 1:10

2. 10:1

3. 100:1

4. 1:100

The strongest Bronsted base among the following ions is:

1. CH₃O^-

2. (CH₃)₂CHO^-

3. C₂H₅O^-

4. (CH₃)₃CO^-

The degree of ionization of water was found to be $1.8\times {10}^{-9}$. The ${\mathrm{K}}_{\mathrm{a}}$ (ionization constant) of water is

1. $1.8\times {10}^{-9}$

2. $1.8\times {10}^{-16}$

3. $1.8\times {10}^{-14}$

4. cannot be calculated

The decreasing order of the acidic nature of ${\mathrm{H}}_2{\mathrm{SO}}_4 \left(\mathrm{I}\right), {\mathrm{H}}_3{\mathrm{PO}}_4 \left(\mathrm{II}\right), \mathrm{and} {\mathrm{HClO}}_4 \left(\mathrm{III}\right)$ is:

1. I>II>III

2. I>III>II

3. III>I>II

4. III>II>I

The number of H⁺ ions present in 1cm³ of a solution whose pH is 10 is

1. ${10}^{-10}$

2. ${10}^{-13}$

3. $6.02\times {10}^{10}$

4. $6.02\times {10}^{13}$

The Ka value of formic acid and acetic acid are respectively $1.77\times {10}^{-4}$ and $1.75\times {10}^{-5}$. The ratio of the acid strength of 0.1 N acids is

1. 0.1

2. 0.3

3. 3.178

4. 100

ZnS is not precipitated by passing H₂S in an acidic medium but CuS is precipitated. The reason for it is

1. ${\mathrm{K}}_{\mathrm{sp}} \mathrm{CuS}<<{\mathrm{K}}_{\mathrm{sp}} \mathrm{ZnS}$

2.${\mathrm{K}}_{\mathrm{sp}} \mathrm{CuS}>>{\mathrm{K}}_{\mathrm{sp}} \mathrm{ZnS}$

3. ${\mathrm{K}}_{\mathrm{sp}} \mathrm{CuS}={\mathrm{K}}_{\mathrm{sp}} \mathrm{ZnS}$

4. None of these

Consider the following acids:

I. HCN

II. CH₃COOH

III. HCOOH

IV. Cl-CH₂COOH

The correct order of strength is

1. II>III>I>IV

2. IV>II>III>I

3. IV>III>II>I

4. III>II>IV>I