PYQSide ExamsMy practice

Surface Chemistry · Question 14

AIPMT 2014MCQEasy📈 Topic in 12% papers+4−1
1

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.

Answer

(2) is negative and, therefore, should be highly negative.

Solution

As per NCERT, when a gas is adsorbed, the freedom of movement of its molecules becomes restricted ⇒ is negative.

For a spontaneous process, = - T must be negative.

∵ -T is positive, ∴ must be highly negative (adsorption is exothermic) so that < 0.

Answer: (2)

AIPMT 2014

Keep practising — Surface Chemistry

2

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
3

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)
4

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)
5

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)
6

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)
7

The Langmuir adsorption isotherm is deduced using the assumption

  1. the adsorption sites are equivalent in their ability to adsorb the particles
  2. the heat of adsorption varies with coverage
  3. the adsorbed molecules interact with each other
  4. the adsorption takes place in multilayers
Out of syllabusAIPMT 2007
8

A plot of (x/m) versus p for the adsorption of a gas on a solid gives a straight line with slope equal to

  1. K
  2. - K
  3. n
  4. 1/n
Out of syllabusAIPMT 2006
9

Which one of the following forms micelles in aqueous solution above certain concentration?

  1. Dodecyl trimethyl ammonium chloride
  2. Glucose
  3. Urea
  4. Pyridinium chloride
Out of syllabusAIPMT 2005
10

Which of the following forms cationic micelles above certain concentration?

  1. Sodium dodecyl sulphate
  2. Sodium acetate
  3. Urea
  4. Cetyltrimethylammonium bromide.
Out of syllabusAIPMT 2004
11

According to the adsorption theory of catalysis, the speed of the reaction increases because

  1. the concentration of reactant molecules at the active centres of the catalyst becomes high due to adsorption
  2. in the process of adsorption, the activation energy of the molecules becomes large
  3. adsorption produces heat which increases the speed of the reaction
  4. adsorption lowers the activation energy of the reaction.
Out of syllabusAIPMT 2003

All Surface Chemistry PYQs →

PDFDownload Surface Chemistry PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
All NEET Chemistry chapters
Physical ChemistrySome Basic Concepts of ChemistryStructure of AtomStates of MatterThermodynamicsEquilibriumRedox ReactionsSolid StateSolutionsElectrochemistryChemical KineticsSurface Chemistry
Inorganic ChemistryClassification of Elements and Periodicity in PropertiesChemical Bonding and Molecular StructureHydrogens-Block Elementsp-Block Elements (Group 13 & 14)Environmental ChemistryGeneral Principles of Isolation of Elementsp-Block Elements (Group 15–18)d- and f-Block ElementsCoordination Compounds
Organic ChemistryOrganic Chemistry – Some Basic Principles and TechniquesIsomerismHydrocarbonsHaloalkanes and HaloarenesAlcohols, Phenols and EthersAldehydes, Ketones and Carboxylic AcidsAminesBiomoleculesPolymersChemistry in Everyday LifePrinciples Related to Practical Chemistry