Some types of gels like gelatin liquify on shaking, thereby changing into sols. The sols on standing change back into a gel. The process is known as

1.  Syneresis

2.  Thixotropy

3.  Peptisation

4.  Imbition

 

A colloid of Agl is formed mixing ${\mathrm{AgNO}}_3$ with an excess of Kl. Which of the given electrolyte will have highest coagulation value for it?

1.  ${\mathrm{BaSO}}_4$

2.  NaCl

3.  ${\mathrm{MgCl}}_2$

4.  ${\mathrm{Al}}_2{\left({\mathrm{SO}}_4\right)}_3$

The decreasing order of coagulating power of an electrolyte to coagulate the ${\mathrm{As}}_2{\mathrm{S}}_3$ sol is

1.  $\mathrm{NaCl} > {\mathrm{Al}}_2{\left({\mathrm{SO}}_4\right)}_3 > {\mathrm{Ba}}_3{\left({\mathrm{PO}}_4\right)}_2$

2.  ${\mathrm{Ba}}_3{\left({\mathrm{PO}}_4\right)}_2 > NaCl > {\mathrm{Al}}_2{\left({\mathrm{SO}}_4\right)}_3$

3.  ${\mathrm{Al}}_2{\left({\mathrm{SO}}_4\right)}_3 > {\mathrm{Ba}}_3{\left({\mathrm{PO}}_4\right)}_2 > NaCl$

4.  $\mathrm{NaCl} >{\mathrm{Ba}}_3{\left({\mathrm{PO}}_4\right)}_2 > {\mathrm{Al}}_2{\left({\mathrm{SO}}_4\right)}_3$

When detergent is added in water, some properties are measured with respect to concentration. Choose the incorrect plot.

1.  

2.  

3.  

4.  

The coagulation of 100 ml of colloidal solution of gold is completely prevented by the addition of 0.25 gm of a substance 'X' to it before adding 1 ml of 10%  NaCl solution. The gold number of 'X' is

1.  25

2.  0.25

3.  2.5

4.  0.025

Which is correct in case of van der Waals adsorption?

1.  High temperature; low pressure

2.  Low temperature; high pressure

3.  Low temperature; low pressure

4.  High temperature; high pressure

The volumes of gasses ${\mathrm{H}}_2, {\mathrm{CH}}_4, {\mathrm{NH}}_3 \mathrm{and} {\mathrm{CO}}_2$ adsorbed by 1 g of charcoal at 298 K in the decreasing order are

1.  ${\mathrm{NH}}_3, {\mathrm{CO}}_2, C{\mathrm{H}}_4, {\mathrm{H}}_2$

2.  ${\mathrm{CO}}_2, {\mathrm{NH}}_3, {\mathrm{H}}_2, C{\mathrm{H}}_4$

3.  ${\mathrm{H}}_2, C{\mathrm{H}}_4, {\mathrm{CO}}_2, {\mathrm{NH}}_3$

3.  $C{\mathrm{H}}_4, {\mathrm{NH}}_3, {\mathrm{CO}}_2, {\mathrm{H}}_2$

The coagulation of 200 mL of a positive colloid took place when 0.73 g HCl was added to it without changing the volume much. The flocculation value of HCl for the colloid is

1.  36.5

2.  100

3.  200

4.  150

Among the following, the surfactant that will form micelles in aqueous solution at the highest molar concentration

1.  ${\mathrm{CH}}_3 - {\left({\mathrm{CH}}_2\right)}_{14} - {{\mathrm{OSO}}_3}^{-} {\mathrm{K}}^{+}$

2.  ${\mathrm{CH}}_3 - {\left({\mathrm{CH}}_2\right)}_{10} - {\mathrm{COO}}^{-} {\mathrm{Na}}^{+}$

3.  ${\mathrm{CH}}_3 - {\left({\mathrm{CH}}_2\right)}_{11} - {{\mathrm{COO}}_3}^{-} {\mathrm{Na}}^{+}$

4.  ${\mathrm{CH}}_3 - {\left({\mathrm{CH}}_2\right)}_{15} - \stackrel{+}{\mathrm{N}}{\mathrm{H}}_3 {\mathrm{Br}}^{\mathrm{e}}$

If $\frac{22}{7}\mathrm{g}$ of charcoal having, active surface area 1000 ${\mathrm{m}}^2/\mathrm{g}$ is used for monolayer absorption of a gas having molecular radius ${10}^{-8}$ cm, then volume of the absorbed gas at STP is [Avogadro's number = $6 \times {10}^{23}$]

1.  11.2 L

2.  22.4 L

3.  7.46 L

4.  3.73 L