Coagulation

Q.

Which mixture of the solution will lead to the formation of negatively charged colloids of $\left[\mathrm{AgI}\right]{\mathrm{I}}^{-}$ sol?

1. $50\mathrm{mL}\mathrm{of}1\mathrm{M}{\mathrm{AgNO}}_3+50\mathrm{ml}\mathrm{of}2\mathrm{M}\mathrm{KI}$

2. $50\mathrm{mL}\mathrm{of}2\mathrm{M}{\mathrm{AgNO}}_3+50\mathrm{ml}\mathrm{of}1.5\mathrm{M}\mathrm{KI}$

3. $50\mathrm{mL}\mathrm{of}1\mathrm{M}{\mathrm{AgNO}}_3+50\mathrm{ml}\mathrm{of}1.5\mathrm{M}\mathrm{KI}$

4. $50\mathrm{mL}\mathrm{of}0.1\mathrm{M}{\mathrm{AgNO}}_3+50\mathrm{ml}\mathrm{of}0.1\mathrm{M}\mathrm{KI}$

Q.

For the coagulation of a negative sol, the species below, that has the highest flocculating power is?

1. $\mathrm{SO}{2}^{-4}$

2. ${\mathrm{Na}}^{+}$

3. ${\mathrm{Ba}}^{2+}$

4. ${\mathrm{PO}}_4^{-3}$

Q.

What is Flocculation value?

Q.

Which of the following order is true about the flocculation power in the coagulation of negative solution?

1. ${\mathrm{Al}}^{3+}>{\mathrm{Ba}}^{2+}>{\mathrm{Na}}^{+}$

2. ${\mathrm{Ba}}^{2+}>{\mathrm{Na}}^{+}>{\mathrm{Al}}^{3+}$

3. ${\mathrm{Na}}^{+}>{\mathrm{Al}}^{3+}>{\mathrm{Na}}^{+}$

4. ${\mathrm{Na}}^{+}>{\mathrm{Al}}^{3+}>{\mathrm{Ba}}^{2+}$

Q. Specific conductance of 0.1 M $C{H}_{3}COOH$ at 25${}^0$C is $3.9\times {10}^{-4}oh{m}^{-1}c{m}^{-1}$ if ${\lambda }^{\infty }\left(H_3{O}^{+}\right)$ and ${\lambda }^{\infty }\left(C{H}_{3}CO{O}^{-}\right)$ at 25${}^0$C are 349.0 and $41.0oh{m}^{-1}c{m}^{2}mo{l}^{-1}$ respectively, degree of ionisation of $C{H}_{3}COOH$ at the given concentration is __________.

1. 1.0%
2. 4.0%
3. 5.0%
4. 2.0%