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Surface Chemistry · Question 9

NEET 2017MCQEasy📈 Topic in 12% papers+4−1
1

Which one of the following statements is not correct?

  1. The value of equilibrium constant is changed in the presence of a catalyst in the reaction at equilibrium.
  2. Enzymes catalyse mainly bio-chemical reactions.
  3. Coenzymes increase the catalytic activity of enzyme.
  4. Catalyst does not initiate any reaction.

Answer

(1) The value of equilibrium constant is changed in the presence of a catalyst in the reaction at equilibrium.

Solution

As per NCERT, a catalyst does not alter the equilibrium constant; it lowers the activation energy of the forward and backward reactions equally and only helps the equilibrium to be attained faster.

Statement (1) is not correct.

(2) Enzymes are biological catalysts for biochemical reactions. (3) As per NCERT, the activity of an enzyme is increased in the presence of certain substances known as coenzymes. (4) A catalyst only alters the rate of a reaction that is already feasible; it does not initiate a reaction.

Answer: (1)

Out of syllabusNEET 2017

Keep practising — Surface Chemistry

2

Fog is a colloidal solution of

  1. solid in gas
  2. gas in gas
  3. liquid in gas
  4. gas in liquid.
Out of syllabusNEET 2016 (Phase 1)
3

Which one of the following characteristics is associated with adsorption?

  1. G and H are negative but S is positive.
  2. G and S are negative but H is positive.
  3. G is negative but H and S are positive.
  4. G, H and S all are negative.
Out of syllabusNEET 2016 (Phase 1)
4

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

  1. I > II > III
  2. II > I > III
  3. III > II > I
  4. III > I > II
Out of syllabusNEET 2016 (Phase 2)
5

Which property of colloidal solution is independent of charge on the colloidal particles?

  1. Electro-osmosis
  2. Tyndall effect
  3. Coagulation
  4. Electrophoresis
Out of syllabusAIPMT 2015 (Cancelled)
6

Which of the following statements is correct for the spontaneous adsorption of a gas?

  1. is negative and, therefore, should be highly positive.
  2. is negative and, therefore, should be highly negative.
  3. is positive and, therefore, should be negative.
  4. is positive and, therefore, should also be highly positive.
AIPMT 2014
7

Which property of colloids is not dependent on the charge on colloidal particles?

  1. Coagulation
  2. Electrophoresis
  3. Electro-osmosis
  4. Tyndall effect
Out of syllabusAIPMT 2014
8

In Freundlich adsorption isotherm, the value of 1n is

  1. between 0 and 1 in all cases
  2. between 2 and 4 in all cases
  3. 1 in case of physical adsorption
  4. 1 in case of chemisorption.
Out of syllabusAIPMT 2012 (Prelims)
9

Which one of the following statements is incorrect about enzyme catalysis?

  1. Enzymes are mostly proteinous in nature.
  2. Enzyme action is specific.
  3. Enzymes are denatured by ultraviolet rays and at high temperature.
  4. Enzymes are least reactive at optimum temperature.
Out of syllabusAIPMT 2012 (Prelims)
10

The protecting power of lyophilic colloidal sol is expressed in terms of

  1. coagulation value
  2. gold number
  3. critical micelle concentration
  4. oxidation number
Out of syllabusAIPMT 2012 (Prelims)
11

If x is amount of adsorbate and m is amount of adsorbent, which of the following relations is not related to adsorption process?

  1. x/m = f(p) at constant T
  2. x/m = f(T) at constant p
  3. p = f(T) at constant (x/m)
  4. xm = p T
Out of syllabusAIPMT 2011 (Prelims)

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