Litmus is not affected by hydracids when they are

1. In contact with water

2. Dry

3. Fused with each other                 

4. Mixed together and dissolved in water

The pH of a 0.01 M NaOH (aq) solution will be:

1. 7.01

2. 2

3. 12

4. 9

The molar solubility of ${\mathrm{CaF}}_2$ $({\mathrm{K}}_{\mathrm{sp}}=5.3$ $\mathrm{\times }$ ${10}^{-11})$ in 0.1 M solution of NaF will be:

1. $5.3$ $\mathrm{\times }$ ${10}^{-11}$ $\mathrm{mol}$ ${\mathrm{L}}^{-1}$

2. $5.3$ $\mathrm{\times }$ ${10}^{-8}$ $\mathrm{mol}$ ${\mathrm{L}}^{-1}$

3. $5.3$ $\mathrm{\times }$ ${10}^{-9}$ $\mathrm{mol}$ ${\mathrm{L}}^{-1}$

4. $5.3$ $\mathrm{\times }$ ${10}^{-10}$ $\mathrm{mol}$ ${\mathrm{L}}^{-1}$

Given a hypothetical reaction :
${\mathrm{AB}}_2\left(\mathrm{g}\right)+\frac{1}{2}{\mathrm{B}}_2\left(\mathrm{g}\right)\rightleftharpoons {\mathrm{AB}}_3\left(\mathrm{g}\right);$ $∆\mathrm{H}=-\mathrm{x}$ $\mathrm{kJ}$
More AB₃​ could be produced at equilibrium by :

When 10 ml of 0.1 M acetic acid (pK_a=5.0) is titrated against 10 ml of 0.1 M
ammonia solution (pK_b=5.0), the pH at equivalence point will be:

For the reaction 2NOCl_(g)⇔2NO_(g)+Cl_2(g), K_C at 427$°$C is \(3\times 10^{-6} \ mol\ L^{-1}\). The value of K_p will be :

1. $1.72\times {10}^{-4}$

2. $7.50\times {10}^5$

3. $2.50\times {10}^{-5}$

4. $2.50\times {10}^{-4}$

The standard reduction potential for ${\mathrm{Cu}}^{2+}/\mathrm{Cu}$ is 0.34 V.
The reduction potential at pH =14 for the above couple given $\left({\mathrm{K}}_{\mathrm{sp}}\left[\mathrm{Cu}{\left(\mathrm{OH}\right)}_2\right]=1\times {10}^{-19}\right)$ is :

1.  -0.22 V

2.  +0.22 V

3.  -0.34 V

4.  +0.34 V

The conjugate bases of Bronsted acids H₂O and HF are respectively:

1. H₃O⁺ and H₂F⁺, respectively.

2. OH^– and H₂F⁺, respectively.

3. H₃O⁺ and F^–, respectively.

4. OH^– and F^–, respectively.

The following pair constitutes a buffer is:

1. $HN{O}_2$ $and$ $NaN{O}_2$

2. $NaOH$ $and$ $NaCl$

3. $HN{O}_3$ $and$ $N{H}_{4}N{O}_3$

4. $HCl$ $and$ $KCl$

The ionic species that has the greatest proton affinity to form stable compound is:

1. $H{S}^{-}$

2. $N{H}_2^{-}$

3. $F^{-}$

4. $l^{-}$