AIEEE 2005 | Surface Chemistry Question 111 | Chemistry

The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged, respectively, which of the following statements is NOT correct?

magnesium chloride solution coagulates, the gold sol more readily than the iron (III) hydroxide sol.

sodium sulphate solution causes coagulation in both sols

mixing the sols has no effect

coagulation in both sols can be brought about by electrophoresis

AIEEE 2005

MCQ (Single Correct Answer)

-1

Out of Syllabus

The volume of a colloidal particle, V_C as compared to the volume of a solute particle in a true solution V_S, could be

$${V_C \over V_S } \simeq 1$$

$${V_C \over V_S } \simeq 10^{-3}$$

$${V_C \over V_S } \simeq 10^3$$

$${V_C \over V_S } \simeq 10^{23}$$

AIEEE 2003

MCQ (Single Correct Answer)

-1

Out of Syllabus

Which one of the following characteristics is not correct for physical adsorption?

Adsorption increases with increase in temperature

Adsorption is spontaneous

Both enthalpy and entropy of adsorption are negative

Adsorption on solids is reversible

AIEEE 2002

MCQ (Single Correct Answer)

-1

Out of Syllabus

The formation of gas at the surface of tungsten due to adsorption is the reaction of order :

insufficient data

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