The solubility product of A₂X₃ is $1.08\times {10}^{-23}$. Its solubility will be

1. $1.0\times {10}^{-3}<mspace\; width="1em"></mspace>\mathrm{M}$

2. $1.0\times {10}^{-4}<mspace\; width="1em"></mspace>\mathrm{M}$

3. $1.0\times {10}^{-5}<mspace\; width="1em"></mspace>\mathrm{M}$

4. $1.0\times {10}^{-6}<mspace\; width="1em"></mspace>\mathrm{M}$

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

Given are 1 M solutions of the following:

The pH values of of the above will be in the order:

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 ${\mathrm{H}}_2{\mathrm{SO}}_4<mspace\; width="1em"></mspace>\left(\mathrm{I}\right),<mspace\; width="1em"></mspace>{\mathrm{H}}_3{\mathrm{PO}}_4<mspace\; width="1em"></mspace>\left(\mathrm{II}\right),<mspace\; width="1em"></mspace>\mathrm{and}<mspace\; width="1em"></mspace>{\mathrm{HClO}}_4<mspace\; width="1em"></mspace>\left(\mathrm{III}\right)$ is:

1. I>II>III

2. I>III>II

3. III>I>II

4. III>II>I

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

The \(K_a\) values 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. ${\mathrm{K}}_{\mathrm{sp}}<mspace\; width="1em"></mspace>\mathrm{CuS}<<{\mathrm{K}}_{\mathrm{sp}}<mspace\; width="1em"></mspace>\mathrm{ZnS}$

2.$<mspace\; width="1em"></mspace>{\mathrm{K}}_{\mathrm{sp}}<mspace\; width="1em"></mspace>\mathrm{CuS}>>{\mathrm{K}}_{\mathrm{sp}}<mspace\; width="1em"></mspace>\mathrm{ZnS}$

3. ${\mathrm{K}}_{\mathrm{sp}}<mspace\; width="1em"></mspace>\mathrm{CuS}={\mathrm{K}}_{\mathrm{sp}}<mspace\; width="1em"></mspace>\mathrm{ZnS}$

4. None of these