Water vapours can be both adsorbed and absorbed by respectively ?

1. Silica gel and CaCl2

2. Chalk and CaCl2

3. CaCl2 and Silica gel

4. CaCl2 and Chalk

Subtopic:  Adsorption and Absorption |
 72%
From NCERT
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The coagulating power of an ion depends on:
 

1. The magnitude of the charge on the ion alone
2. Size of the ion alone
3. Both magnitude and sign of the charge on the ion.
4. The sign of the charge on the ion alone.

Subtopic:  Colloidal Solution |
 78%
From NCERT
NEET - 2018
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The characteristics associated with adsorption are:

1. ∆G, ∆H, and ∆S are all negative.
2. ∆G and ∆H are negative, but ∆S is positive.
3. ∆G and ∆S are negative, but ∆H is positive.
4. ∆G is negative, but ∆H and ∆S are positive.

Subtopic:  Adsorption and Absorption |
 82%
From NCERT
NEET - 2016
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In the Freundlich adsorption isotherm, the value of 1/n is:
1. Between 0 and 1 in all cases.
2. Between 2 and 4 in all cases.
3. 1 in the case of physical adsorption.
4. 1 in the case of chemisorption.

Subtopic:  Adsorption Isotherm |
 91%
From NCERT
AIPMT - 2012
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Which mixture of the solutions will lead to the formation of a negatively charged colloidal [AgI]I- sol?

1. 50 mL of 0.1 M AgNO3 + 50 mL of 0.1 M KI

2. 50 mL of 1 M AgNO3 + 50 mL of 0.5 M KI

3. 50 mL of 1 M AgNO3 + 50 mL of 2 M KI

4. 50 mL of 2 M AgNO3 + 50 mL of 1.5 M KI

Subtopic:  Colloidal Solution |
 65%
From NCERT
NEET - 2019
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The equation that represents a Freundlich adsorption isotherm is: 

1. xm=kp0.3

2. xm=kp2.5

3. xm=kp-0.5

4. xm=kp-1

Subtopic:  Adsorption Isotherm |
 71%
From NCERT
NEET - 2019
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The coagulating power of electrolytes with ions Na+,  Al3+, and Ba2+ rise for arsenic sulphide sol increases in the order :

1. Al3Ba2Na+

2. NaBa2Al3+

3. Ba2NaAl3+

4. Al3NaBa2+

Subtopic:  Colloidal Solution |
 88%
From NCERT
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KClO3 on heating decomposes into KCl and O2. If some MnO2 is added, the reaction goes much faster because:

1. MnO2 decomposes to give oxygen.

2. MnO2 provides  heat by reacting.

3. Better contact is provided by MnO2

4. MnO2 acts as a catalyst.

Subtopic:  Catalyst |
 84%
From NCERT
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Which of the following electrolytes, Na2SO4, CaCl2, Al2(SO4)3, and NH4Cl, is the most effective coagulating agent for Sb2S3 sol?

1. Na2SO4                             

2. CaCl2

3. Al2(SO4)3                           

4. NH4Cl

Subtopic:  Colloidal Solution |
 87%
From NCERT
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The surface tension of lyophilic sols is:

1. Lower than H2O

2. More than H2O

3. Equal to H2O

4. None of the above.

Subtopic:  Lyophilic & Lyophobic Sol |
 58%
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