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IMPORTANT
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Arsenic III sulphide forms a sol with a negative charge. Which of the following ionic substances should be most effective in coagulating the sol?

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Important Questions on Surface Chemistry

EASY
JEE Main/Advance
IMPORTANT
Smoke has generally blue tinge. It is due to :
MEDIUM
JEE Main/Advance
IMPORTANT
Which one of the following statements is false for hydrophilic sols?
HARD
JEE Main/Advance
IMPORTANT

When a graph is plotted between log x/m and log p, it is a straight line with an angle of 45° and an intercept of 0.3010 on the y-axis. If the initial pressure is 0.3 atm, what will be the amount of gas adsorbed per gram of adsorbent? 

(Report your answer after multiplying by 10)

EASY
JEE Main/Advance
IMPORTANT

The volume of nitrogen gas (measured at STP) required to cover a sample of silica gel with a monomolecular layer is 129 cm3/g of gel. Calculate the surface area per gram of the gel if each nitrogen molecule occupies 16.2×10-20 m2.

(Report your answer after dividing by 10)

HARD
JEE Main/Advance
IMPORTANT

How many of these reactions are homogeneously catalysed?

(i) 2SO2g+O2gNO(g)2SO3g

(ii) C12H22O11aq+H2OlH2SO4(l)C6H12O6aq + C6H12O6 aq

(iii) 2SO3g+O2g Pt(s) 2SO3g
(iv) N2g+3H2gFe(s)2NH3g

(v) 4NH3g+5O2gPt(s)4NOg+6H2Og

(vi) CH3COOCH3lHCl(l)CH3COOHaq

(vii) Vegetable oils l+H2gNi(s) Vegetable ghee s 

EASY
JEE Main/Advance
IMPORTANT
The coagulation value of the electrolytes AlCl3 and NaCl for As2S3 solutions are 0.093 and 52, respectively. How many times AlCl3 has greater coagulating power than NaCl?
HARD
JEE Main/Advance
IMPORTANT

Among the following, the number of correct statements is:

(i) The stability of the lyophilic colloids is mainly due to the strong interaction between the dispersed particles and the dispersion medium.

(ii) The entropy change for the adsorption of the gases over the solid is positive.

(iii) Gelatin has a considerably lower value of the gold number and is an effective protective colloid.

(iv) The zeta potential is also responsible for the stability of the lyophobic colloid solution.

(v) The surface tension of the lyophilic colloidal solution is lesser than that of the dispersion medium.

HARD
JEE Main/Advance
IMPORTANT
For the coagulation of 250 mL of Fe(OH)3 solution, 2 mL of 1 M Na2SO4 electrolyte is required. What is the coagulating value of the Na2SO4 electrolyte?