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Surface Chemistry

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2 months ago

Surface Chemistry Class 12th

Tyndall effect is more effectively shown by:
0 Follower 1 View

V
Vishal Baghel

Contributor-Level 10

Tyndall effect is more effectively shown by lyophobic colloidal solution.

New answer posted

2 months ago

Surface Chemistry Class 12th

Which one of the following is correct for the adsorption of a gas at a given temperature on a solid surface?
0 Follower 2 Views

V
Vishal Baghel

Contributor-Level 10

During adsorption of a gas on solid surface, process is exothermic i.e. Δ H = − v e ( Δ H < 0 )  and entropy decreased, because gas particle resides on solid surface. Hence Δ S < 0 .

New answer posted

2 months ago

Surface Chemistry Class 12th

The sol given below with negatively charged colloidal particles is:
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A
alok kumar singh

Contributor-Level 10

When AgNO3 added to Kl solution, it form precipitate of Agl (s) which absorb I- ions from Kl and colloidal particles become negatively charged.

New answer posted

2 months ago

Surface Chemistry Class 12th

Using very little soap while washing clothes, does not serve the purpose of cleaning of clothes, because:
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V
Vishal Baghel

Contributor-Level 10

Micelles are not formed because it formed above CMC.

New answer posted

2 months ago

Surface Chemistry Class 12th

Given below are the critical temperature of some of the gases:

Gas

Critical temperature (K)

He

5.2

CH4

190.0

CO2

304.2

NH3

405.5

The gas showing least adsorption on a definite amount of charcoal is
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P
Payal Gupta

Contributor-Level 10

Higher adsorbtion of gas is corresponds to higher liquefaction and higher liquefaction is directly proportional to the higher critical temperature.

New answer posted

2 months ago

Surface Chemistry Class 12th

For micelle formation, which of the following statements are correct?

A. Micelle formation is an exothermic process.

B. Micelle formation is an endothermic process.

C. The entropy change is positive.

D. The entropy change is negative.
0 Follower 3 Views

P
Payal Gupta

Contributor-Level 10

During micelle formation, Δ S  is positive

Micelle formation is endothermic at low temperature and exothermic at high temperature.

At room temperature ⇒ Micelle formation is endothermic.

New answer posted

2 months ago

Surface Chemistry Class 12th

Match the List-I with List-II

List – I                                                                       List – II

(A) Lyophilic colloid                         

...more
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V
Vishal Baghel

Contributor-Level 10

 Emulsion are liquid colloids, protective colloids are lyophilic, FeCl3 + H2O → Δ ( + v e ) l y  charged colloids and FeCl3 + NaOH →           (-ve)ly charged colloids.

New answer posted

2 months ago

Surface Chemistry Class 12th

Given below are two statements. One is labeled as Assertion A and the other is labeled as Reason R.

           Assertion A: Activated charcoal adsorbs SO2 more efficiency than CH4.

           Reason R:  Gases with lower critical temperature are readily adsorbed by activated charcoal.

           In the light of the above statements, choose the correct answer from the options given below:
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A
alok kumar singh

Contributor-Level 10

SO2 is absorbed to a greater extent then CH4 on activated charcoal under same Gases with higher critical temperature are readily absorbed by activated charcoal.

New answer posted

2 months ago

Surface Chemistry Class 12th

For kinetic study of the reaction of iodide ion with H2O2 at room temperature:

(A) Always use freshly prepared starch solution.

(B) Always keep the concentration of sodium thiosulphate solution less than that of Kl solution.

(C) Record the time immediately after the appearance of blue colour.

(D) Record the time immediately before the appearance of blue colour.

(E) Always keep the concentration of sodium thiosulphate solution more than that of Kl solution.

Choose the correct answer from the options given below:
0 Follower 1 View

V
Vishal Baghel

Contributor-Level 10

Always fresh solution of starch used and recorded immediately after the blue colour appears. Na2S2O3 is used in limited amount.

New answer posted

2 months ago

Surface Chemistry Class 12th

Given below are the critical temperature of some of the gases:

The gas showing least adsorption on a definite amount of charcoal is

 
0 Follower 1 View

A
alok kumar singh

Contributor-Level 10

Higher adsorbtion of gas is corresponds to higher liquefaction and higher liquefaction is directly proportional to the higher critical temperature.

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