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Which gas will be adsorbed on a solid to greater extent?
1. Having non-polar molecule
2. Having highest critical temperature
3. Having lowest critical temperature
4. Having lowest critical pressure

The volume of gases $N{H}_3$, $C{O}_2$ and $H_2$ adsorbed by one gram of charcoal at 300 K are in order of :
1. $H_2$ > $C{O}_2$ > $N{H}_3$
2. $N{H}_3$ > $H_2$  > $C{O}_2$
3. $N{H}_3$ > $C{O}_2$ > $H_2$ 
4. $C{O}_2$ > $N{H}_3$ > $H_2$ 

Which of the following is used to adsorb water?
1. Silica gel
2. Calcium acetate
3. Hairgel
4. Anhydrous Ca$C{l}_2$

Which of the following adsorption isotherms represents the adsorption of a gas by a solid involving multilayers of formation? ( $p_s$ = saturation pressure)
1. 
2. 
3. 
4. 

A plot of log $\left(\frac{x}{M}\right)$ against log P for the adsorption of a gas on a solid gives a
straight line with slope equal to :
1. $\frac{1}{n}$
2. n
3. log K
4. K

The function of zymase is to:
 
1. Change starch into sugar.
2. Ferment glucose to alcohol and CO₂.
3. Change malt sugar into glucose.
4. Change starch into malt sugar and dextrin.

Surface tension of lyophilic sols is :
 
1. Lower than water.
2. More than water.
3. Equal to water.
4. None of the above.

All colloids:
1. Are suspension of one phase in another.
2. Are two-phase systems.
3. Contain only water-soluble particles.
4. Are true solutions.

Bredig’s arc method cannot be used for the preparation of colloidal sol of:
1. Copper
2. Gold
3. Silver
4. Sodium

Which of the following electrolyte will most effective in coagulation of negative sol?
1. $KN{O}_3$
2. $K_4\left[Fe{\left(CN\right)}_6\right]$
3. $N{a}_{3}P{O}_4$
4. $MgC{l}_2$

The minimum amount of an electrolyte required to cause coagulation of a sol is called :
 
1. Coagulation value
2. Gold number
3. Protective value
4. None of these

Peptization involves:
 
1. Precipitation of colloidal particles.
2. Disintegration of colloidal aggregates.
3. Purification of colloids.
4. Both (1) and (3)

An emulsifying agent is a substance which 
 
1. Stabilizes the emulsion.
2. De-stabilizes the emulsion.
3. Coagulates the emulsion.
4. Break the interfacial film between suspended particle and medium.

Colloidal solution of gold is prepared by :
1. Colloidal mill
2. Double decomposition method
3. Bredig’s method
4. Peptization

Artificial rain is caused by spraying:
1. Opposite charged colloidal dust over a cloud
2. Same charged colloidal dust over a cloud
3. Both
4. None of these

On adding AgN$O_3$ solution into Kl solution, a negatively charged colloidal sol is obtained when they are in :
1. 5O mL of O.1 M AgN$O_3$+50 mL of 0.1M Kl
2. 5O mL of O.1 M AgN$O_3$+5O mL of 0.2 M Kl
3. 5O mL of O.2 M AgN$O_3$+5O mL of 0.1 M Kl
4. None of the above

The gold numbers of protective colloids A, B, C and D are 0.04, 0.004, 10 and 40
respectively. The protective powers of A, B, C and D are in the order :
1. A>B>C>D
2. B>A>C>D
3. D>C>A>B
4. D>C>B>A

The Tyndall effect associated with colloidal particles is due to :
1. Presence of electrical charges
2. Scattering of light
3. Absorption of light
4. Reflection of light

Blue colour of the sky is due to :
 
1. Absorption of light by dust particles.
2. Reflection of light by dust particles.
3. Scattering of light by dust particles.
4. None of the above.