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

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 oxoacid that has the highest K_a value is: t

1 HClO₃

2 HBrO₃

3 HlO₃

4 All have equal K_a

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

For the following reaction, 
 H$$₂(g)+I₂(g)⇌2HI(g) $at$ $250°C,$

The effect on the state of equilibrium on doubling the volume of the system will be:

Which of the following cannot act as a buffer? 
1. NaH₂PO₄ + H₃PO₄
2. NH₄OH + NH₄CI
3. NaOH + CH₃COONa
4. Both (1) & (3)

If the pH of 0.1 M NaCN solution is 11, then the percentage hydrolysis will be:

1. 0.1%

2. 1%

3. 0.01%

4. 10%