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Surface Chemistry — NEET UG Chemistry PYQs

538 previous year questions from Surface Chemistry with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

538 questionsChemistrySolutions on every page
1

Which of the following is a positively charged sol?

NEET 2023 Solution View → 2

Pumice stone is an example of

NEET 2023 Solution View → 3

Which one is an example of heterogenous catalysis?

NEET 2023 Solution View → 4

Shown below are adsorption isotherms for a gas ' X ' at temperatures T ₁, ~T ₂ and T ₃ : p and x m represent pressure and extent of adsorption, respectively. The correct order of t

NEET 2022 Solution View → 5

Given below are two statements : Statement I : In the coagulation of a negative sol, the flocculating power of the three given ions is in the order - Al 3 + > Ba 2 + > Na +

NEET 2022 Solution View → 6

The right option for the statement "Tyndall effect is exhibited by", is:

NEET 2021 Solution View → 7

Measuring Zeta potential is useful in determining which property of colloidal solution?

NEET 2020 Solution View → 8

In which of the sols, the colloidal particles are with negative charge?

NEET 2020 Solution View → 9

Which of the following statements is incorrect about colloidal solution?

AIIMS 2019 Solution View → 10

Assertion : Lyophilic colloid protects lyophobic colloid. Reason : Lyophilic colloid particles cover up the particles of the lyophobic colloid.

AIIMS 2019 Solution View → 11

Butter is a colloidal solution of

JIPMER 2019 Solution View → 12

Which mixture of the solutions will lead to the formation of negatively charged colloidal A g I I - sol?

NEET 2019 Solution View → 13

The correct option representing a Freundlich adsorption isotherm is

NEET 2019 Solution View → 14

Which of the following statements is incorrect?

AIIMS 2018 Solution View → 15

Assertion : Fe ( OH )₃ and As ₂ ~S ₃ colloidal sols on mixing precipitate. Reason : Fe ( OH )₃ and As ₂ ~S ₃ combine and form precipitate of new composition.

AIIMS 2018 Solution View → 16

Assertion : On passing electric current in colloidal solution they do not move towards anode or cathode. Reason : They do not contain any charge.

AIIMS 2018 Solution View → 17

Assertion : Soap is mixed to form O/W emulsion. Reason : Soap reduces surface tension.

AIIMS 2018 Solution View → 18

Red blood cells are placed in a solution and neither haemolysis nor crenation occurs. Therefore, the solution is

JIPMER 2018 Solution View → 19

Which of the following is not a surfactant?

JIPMER 2018 Solution View → 20

Bleeding due to a cut can be stopped by applying ferric chloride solution in the laboratory. This is due to

JIPMER 2018 Solution View → 21

On which of the following properties, does the coagulating power of an ion depend?

NEET 2018 Solution View → 22

The coagulation of 200 ~mL of a positive colloid took place when 0.73 ~g HCl was added to it without changing the volume much. The flocculation value of HCl for the colloid is

AIIMS 2017 Solution View → 23

Assertion : Activity of an enzyme is pH -dependent. Reason : Change in pH affects the solubility of the enzyme in water.

AIIMS 2017 Solution View → 24

Which of the following is not applicable to the phenomenon of adsorption?

JIPMER 2017 Solution View → 25

Paints and hair creams are respectively

AIIMS 2016 Solution View → 26

On the basis of Langmuir adsorption isotherm the amount of gas adsorbed at very high pressure.

JIPMER 2016 Solution View → 27

Which one of the following characteristics is associated with adsorption?

NEET 2016 Solution View → 28

The coagulation values in millimoles per litre of the electrolytes used for the coagulation of A s 2 S 3 are given below, I . N a C l = 52 II . B a C l 2 = 0.69 III . M g S O 4 = 0

NEET 2016 Solution View → 29

Fog is a colloidal solution of:

NEET 2016 Solution View → 30

A colloidal solution is kept in dark and is illuminated by a beam of light then, brightness appears at the right angle of direction of light. This effect is called

AIIMS 2015 Solution View → 31

Assertion: Fe ³⁺ can be used for coagulation of As ₂ ~S ₃ sol. Reason: Fe ³⁺ reacts with As ₂ ~S ₃ to give Fe ₂ ~S ₃ .

AIIMS 2015 Solution View → 32

Which of the following represents physical adsorption?

JIPMER 2015 Solution View → 33

In an experiment, addition of 4.0 mL of 0.005 M BaCl ₂ to 16.0 mL of arsenious sulphide sol just causes complete coagulation in 2 h . The flocculating value of the effective ion is

JIPMER 2015 Solution View → 34

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

NEET 2015 Solution View → 35

Purification of colloids is done by

AIIMS 2014 Solution View → 36

Which one of the following is an example for homogeneous catalysis?

AIIMS 2014 Solution View → 37

Assertion : Coagulation power of Al ³⁺ is more than Na ⁺ . Reason: Greater the valency of the flocculating ion added, greater is its power to cause precipitation (Hardy-Schulze rul

AIIMS 2014 Solution View → 38

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

JIPMER 2014 Solution View → 39

Which of the following is an example for heterogeneous catalysis reaction?

JIPMER 2014 Solution View → 40

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

NEET 2014 Solution View → 41

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

NEET 2014 Solution View → 42

According to Hardy schulze law, the flocculating power of an ion increases with

AIIMS 2013 Solution View → 43

Assertion : Catalyst changes Gibbs free energy of system. Reason : Catalyst changes pre-exponential factor of a chemical reaction.

AIIMS 2013 Solution View → 44

Which of the following curves is in accordance with Freundlich adsorption isotherm?

JIPMER 2013 Solution View → 45

In the presence of a catalyst, the heat evolved or absorbed during the reacton

JIPMER 2013 Solution View → 46

A colloidal solution is kept in dark and is illuminated by a beam of light then brightness appears at the right angle of direction of light. This effect is called

AIIMS 2012 Solution View → 47

Cow milk, an example of natural emulsion, is stabilised by

JIPMER 2012 Solution View → 48

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

NEET 2012 Solution View → 49

The ease of adsorption of the hydrated alkali metal ions on an ion-exchange resins follows the order

NEET 2012 Solution View → 50

In Freundlich adsorption isotherm, the value of 1 / n is

NEET 2012 Solution View → 51

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

NEET 2012 Solution View → 52

Which of the following is incorrect for physisorption?

AIIMS 2011 Solution View → 53

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

NEET 2011 Solution View → 54

Butter is an example of which type of colloid?

AIIMS 2010 Solution View → 55

The number of phase in a colloidal system is

JIPMER 2010 Solution View → 56

Which of the following is correct?

JIPMER 2009 Solution View → 57

Correct equation of Freundlich isotherm is

AIIMS 2008 Solution View → 58

Gold number is associated with

JIPMER 2008 Solution View → 59

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

JIPMER 2007 Solution View → 60

The Langmuir adsorption isotherm is deduced using the assumption:

NEET 2007 Solution View → 61

Assertion : Fe ³⁺ can be used for coagulation of As ₂ ~S ₃ sol. Reason : Fe ³⁺ reacts with As ₂ ~S ₃ to give Fe ₂ ~S ₃ .

AIIMS 2006 Solution View → 62

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

NEET 2006 Solution View → 63

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

NEET 2005 Solution View → 64

Assertion : Aqueous gold colloidal solution is red in colour. Reason : The colour arises due to scattering of light by colloidal gold particles.

AIIMS 2004 Solution View → 65

Assertion : Alcohols are dehydrated to hydrocarbons in the presence of acidic zeolites. Reason : Zeolites are porous catalysts.

AIIMS 2004 Solution View → 66

Which of the following statement is not correct?

JIPMER 2004 Solution View → 67

Solvent loving colloids are known as

JIPMER 2004 Solution View → 68

Which of the following forms cationic micelles above certain concentration?

NEET 2004 Solution View → 69

Assertion : Activity of an enzyme is pH dependent. Reason : Change in pH affects the solubility of the enzyme in water.

AIIMS 2003 Solution View → 70

Assertion : Haemoglobin is an oxygen carrier. Reason : Oxygen binds as O ₂⁻ to Fe of haemoglobin.

AIIMS 2003 Solution View → 71

Assertion : The micelle formed by sodium stearate in water has - COO ⁻ groups at the surface. Reason : Surface tension of water is reduced by the addition of stearate.

AIIMS 2003 Solution View → 72

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

NEET 2003 Solution View → 73

Enzymes with two sites are called

AIIMS 2002 Solution View → 74

The size of colloidal particle is

AIIMS 2002 Solution View → 75

Assertion : Physical absorption of molecules takes place on surface only. Reason : In this process, the bonds of the absorbed molecules are broken.

AIIMS 2002 Solution View → 76

Assertion : An increase in surface area increases the rate of evaporation. Reason : Stronger the inter-molecular attractive forces, fast is the rate of evaporation at a given tempe

AIIMS 2002 Solution View → 77

Position of non-polar and polar parts in micelle is:

NEET 2002 Solution View → 78

Correct equation of Freundrich isotherm is

AIIMS 2001 Solution View → 79

A packet of colloidal system is taken in which colloidal particles are still. Two electrodes are taken in system and voltage is applied so that liquid medium moves under the influe

AIIMS 2001 Solution View → 80

In the gas mask device, what is typically used as an adsorbent?

NEET Solution View → 81

In the oxidation of sulfur dioxide into sulfur trioxide, what metal is the catalyst?

NEET Solution View → 82

Why do colloidal solutions show values of colligative properties of a small order?

NEET Solution View → 83

How is the rate of reaction increased in heterogeneous catalysis?

NEET Solution View → 84

What factor influences the wavelength of light scattered by dispersed particles?

NEET Solution View → 85

What happens to the anions at the critical micelle concentration?

NEET Solution View → 86

How do lyophobic sols behave once precipitated?

NEET Solution View → 87

According to Freundlich isotherm, when 1/n is equal to 1, what does it imply about the adsorption?

NEET Solution View → 88

How many molecules of H 2 S are involved in the double decomposition reaction with As 2 O 3 ?

NEET Solution View → 89

What enzyme is responsible for the conversion of proteins into amino acids in the intestine?

NEET Solution View → 90

What is the product of the hydrolysis of methyl acetate?

NEET Solution View → 91

What may happen when physical adsorption occurs at low temperatures?

NEET Solution View → 92

What is the role of the hydrocarbon chains in micelle formation?

NEET Solution View → 93

In the coagulation of a positive sol, which ion has the least flocculating power?

NEET Solution View → 94

What ultimately happens to the precipitates during peptization?

NEET Solution View → 95

In the coagulation of a positive sol, what is the order of flocculating power for the mentioned ions?

NEET Solution View → 96

What solvents can cause dehydration of the dispersed phase in hydrophilic sols?

NEET Solution View → 97

How can a lyophilic sol be coagulated?

NEET Solution View → 98

In the coagulation of a negative sol, what is the order of flocculating power for the mentioned ions?

NEET Solution View → 99

What acts as a protective colloid in fertile soils?

NEET Solution View → 100

Which of the following is positively charged sol?

NEET Solution View → 101

What is the role of charcoal in the production of high vacuum?

NEET Solution View → 102

What is an example of a bulk phase in surface chemistry?

NEET Solution View → 103

Why does the air become dry in the presence of silica gel?

NEET Solution View → 104

Why is the enthalpy of adsorption in physical adsorption considered low?

NEET Solution View → 105

How does the adsorption process change with a rise in temperature in chemisorption?

NEET Solution View → 106

In the presence of what substance is amylase catalytically very active?

NEET Solution View → 107

What does the activity of a catalyst depend upon?

NEET Solution View → 108

What is the application of finely divided nickel in industrial processes?

NEET Solution View → 109

Why is the catalyst effective even in small quantities according to the modern adsorption theory?

NEET Solution View → 110

What conditions are necessary for the observation of the Tyndall effect, as mentioned in the paragraph?

NEET Solution View → 111

What is used to break emulsions into constituent liquids?

NEET Solution View → 112

What is the result when ∆H becomes equal to T∆S in an adsorption process?

NEET Solution View → 113

What is the main advantage of electrodialysis over ordinary dialysis?

NEET Solution View → 114

How does the volume of gas influence the adsorption of gas by a solid, according to Le-Chatelier’s principle?

NEET Solution View → 115

What chemical process is involved in the preparation of sols when FeCl 3 reacts with 3H 2 O?

NEET Solution View → 116

What is the function of an emulsifying agent in stabilizing emulsions?

NEET Solution View → 117

Why are colloidal medicines more effective?

NEET Solution View → 118

What term is used to describe the accumulation of molecular species at the surface of a solid or liquid?

NEET Solution View → 119

How do certain precipitates like silver halides contribute to adsorption indicators?

NEET Solution View → 120

Why are emulsions of oil in water sometimes unstable?

NEET Solution View →
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