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1

### NEET 2016 Phase 2

The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As2S3 are given below :
I.  (NaCl) = 52,
II. (BaCl2) = 0.69,
III. (MgSO4) = 0.22
The correct order of their coagulating power is
A
I > II > III
B
II > I > III
C
III > II > I
D
III > I > II

## Explanation

As,

Coagulating power $$\infty$$
1
Coagulation value

Lower the coagulation value, higher is the coagulating power so, the correct order is :

III > II > I
2

### NEET 2016 Phase 1

Which one of the following characteristics is associated with adsorption?
A
$$\Delta$$G and $$\Delta$$H are negative but $$\Delta$$S is positive.
B
$$\Delta$$G and $$\Delta$$S are negative but $$\Delta$$H is positive.
C
$$\Delta$$G is negative but $$\Delta$$H and $$\Delta$$S are positive.
D
$$\Delta$$G, $$\Delta$$H and $$\Delta$$S all are negative.

## Explanation

Adsorption is spontaneous process, therefore change in the free energy ( $$\Delta$$G) for the process is negative.

As we know that

$$\Delta$$G = $$\Delta$$H – T$$\Delta$$S

S is negative because adhering of gas molecules to the surface lowers the randomness.

$$\therefore$$ $$\Delta$$G can be –ve only when $$\Delta$$H is –ve.
3

### AIPMT 2015 Cancelled Paper

Which property of colloidal solution is independent of charge on the colloidal particles?
A
Electro-osmosis
B
Tyndall effect
C
Coagulation
D
Electrophoresis

## Explanation

Tyndall effect is the scattering of light by sol particles which cannot be affected by charge on them.
4

### AIPMT 2014

Which property of colloids is not dependent on the charge on colloidal particles?
A
Coagulation
B
Electrophoresis
C
Electro-osmosis
D
Tyndall effect

## Explanation

Tyndall effect is due to the scattering of light by colloidal particles and not due to the charge.

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NEET

Class 12