JEE Chemistry Surface Chemistry MCQs Set 17

Multiple Choice Questions (MCQs) for JEE Chemistry: Surface Chemistry

Explore reliable objective questions for Surface Chemistry tailored for JEE learners. Utilizing these Chemistry multiple-choice formats ensures thorough preparation and strengthens problem-solving speed for upcoming school assessments.

Practice Surface Chemistry MCQs for JEE Chemistry

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Multiple Choice Questions

Question 1: Bredig's arc method cannot be used to prepare a colloidal solution of which of the following?
(a) Pt
(b) Ag
(c) Au
(d) Fe
Show Answer & Explanation

Answer: (d) Fe

Explanation:
1. Bredig's arc method works for inert metals such as Pt, Ag and Au.
2. Iron is oxidised in the arc, so its sol cannot be made this way.
3. Answer: (d)

Teacher's Note:
1. Recall the definition or classification first and eliminate options that contradict it. Check the answer against a standard example.

Question 2: Which one of the following is correctly matched?
(a) emulsion – curd
(b) foam – mist
(c) aerosol – smoke
(d) sol – cake
Show Answer & Explanation

Answer: (c) aerosol – smoke

Explanation:
1. Smoke is a solid dispersed in a gas, i.e. an aerosol.
2. Curd is a gel, mist an aerosol (liquid in gas), and cake is a solid foam.
3. Answer: (c)

Teacher's Note:
1. Recall the definition or classification first and eliminate options that contradict it. Check the answer against a standard example.

Question 3: The protecting power of lyophilic colloidal sols is expressed in terms of:
(a) coagulation value
(b) gold number
(c) critical micelle concentration
(d) oxidation number
Show Answer & Explanation

Answer: (b) gold number

Explanation:
1. Gold number is the minimum mass (mg) of a protective colloid that prevents coagulation of 10 mL of gold sol on adding 1 mL of 10% NaCl.
2. A smaller gold number means greater protecting power.
3. Answer: (b)

Teacher's Note:
1. Recall the definition or classification first and eliminate options that contradict it. Check the answer against a standard example.

Question 4: According to the Freundlich adsorption isotherm, which of the following is correct?
(a) x/m ∝ p0
(b) x/m ∝ p1/n
(c) x/m ∝ p1
(d) all the above are correct for different pressure ranges
Show Answer & Explanation

Answer: (d) all the above are correct for different pressure ranges

Explanation:
1. The isotherm is x/m = kp1/n with 1/n between 0 and 1.
2. At low pressure x/m ∝ p1, at intermediate pressure p1/n, and at high pressure p0.
3. Answer: (d)

Teacher's Note:
1. Recall the definition or classification first and eliminate options that contradict it. Check the answer against a standard example.

Question 5: Among the electrolytes Na2SO4, CaCl2, Al2(SO4)3 and NH4Cl, the most effective coagulating agent for Sb2S3 sol is:
(a) Na2SO4
(b) CaCl2
(c) Al2(SO4)3
(d) NH4Cl
Show Answer & Explanation

Answer: (c) Al2(SO4)3

Explanation:
1. Sb2S3 sol is negatively charged, so the cation does the coagulating (Hardy–Schulze rule).
2. Al3+ has the highest charge, so Al2(SO4)3 is the most effective.
3. Answer: (c)

Teacher's Note:
1. Recall the definition or classification first and eliminate options that contradict it. Check the answer against a standard example.

Question 6: A plot of log x/m versus log P for the adsorption of a gas on a solid gives a straight line with slope equal to:
(a) 1/n
(b) log K
(c) −log K
(d) n
Show Answer & Explanation

Answer: (a) 1/n

Explanation:
1. Taking logs of x/m = kP1/n gives log(x/m) = log k + (1/n) log P.
2. The slope is 1/n and the intercept is log k.
3. Answer: (a)

Teacher's Note:
1. Recall the definition or classification first and eliminate options that contradict it. Check the answer against a standard example.

Question 7: In the petrochemical industry, alcohols are directly converted to gasoline by passing over heated:
(a) platinum
(b) ZSM-5
(c) iron
(d) nickel
Show Answer & Explanation

Answer: (b) ZSM-5

Explanation:
1. ZSM-5 is a shape-selective zeolite catalyst.
2. It converts alcohols into a gasoline-range hydrocarbon mixture.
3. Answer: (b)

Teacher's Note:
1. Recall the definition or classification first and eliminate options that contradict it. Check the answer against a standard example.

Question 8: Which of the following is NOT a characteristic of chemisorption?
(a) adsorption is irreversible
(b) ΔH is of the order of 40 kJ
(c) adsorption is specific
(d) adsorption increases with increase of surface area
Show Answer & Explanation

Answer: (b) ΔH is of the order of 40 kJ

Explanation:
1. Chemisorption involves bond formation, with ΔH about 80–240 kJ mol−1.
2. An enthalpy of about 40 kJ is typical of physisorption.
3. Answer: (b)

Teacher's Note:
1. Recall the definition or classification first and eliminate options that contradict it. Check the answer against a standard example.

Question 9: The process which is catalysed by one of the products is called:
(a) positive catalysis
(b) negative catalysis
(c) autocatalysis
(d) none of these
Show Answer & Explanation

Answer: (c) autocatalysis

Explanation:
1. When a product speeds up its own formation the process is autocatalysis.
2. An example is Mn2+ catalysing the oxalic acid and KMnO4 reaction.
3. Answer: (c)

Teacher's Note:
1. Recall the definition or classification first and eliminate options that contradict it. Check the answer against a standard example.

Question 10: Match X (colloids) with Y (classification). X: I smoke, II gelatin, III soap lather, IV milk. Y: A gel, B aerosol, C emulsion, D foam.
(a) I-A, II-B, III-C, IV-D
(b) I-A, II-C, III-B, IV-D
(c) I-B, II-A, III-D, IV-C
(d) I-B, II-A, III-C, IV-D
Show Answer & Explanation

Answer: (c) I-B, II-A, III-D, IV-C

Explanation:
1. Smoke is a solid in gas (aerosol) and gelatin is a gel.
2. Soap lather is gas in liquid (foam) and milk is liquid in liquid (emulsion).
3. Answer: (c)

Teacher's Note:
1. Recall the definition or classification first and eliminate options that contradict it. Check the answer against a standard example.

Question 11: Some of the following are true solutions: I urea solution, II gelatin, III glucose solution, IV NaCl solution, V butter, VI blood. Select the true solutions.
(a) I, III, IV
(b) II, III, IV, V
(c) I, IV, V
(d) II, IV, VI
Show Answer & Explanation

Answer: (a) I, III, IV

Explanation:
1. Urea, glucose and NaCl dissolve as molecules or ions below 1 nm, forming true solutions.
2. Gelatin, butter and blood are colloidal.
3. Answer: (a)

Teacher's Note:
1. Recall the definition or classification first and eliminate options that contradict it. Check the answer against a standard example.

Question 12: Match Column-I with Column-II. A chemisorption, B physisorption, C desorption of a solute on a liquid surface, D adsorption of a solute on a liquid surface. P: not specific and decreases with temperature; Q: specific and increases with temperature (initially); R: increases the surface tension of the liquid; S: decreases the surface tension of the liquid.
(a) A–Q, B–P, C–R, D–S
(b) A–P, B–Q, C–R, D–S
(c) A–S, B–R, C–Q, D–P
(d) A–Q, B–S, C–P, D–R
Show Answer & Explanation

Answer: (a) A–Q, B–P, C–R, D–S

Explanation:
1. Chemisorption is specific and needs activation (rises with temperature at first); physisorption is non-specific and falls with temperature.
2. Adsorption of a solute lowers surface tension; desorption raises it.
3. Answer: (a)

Teacher's Note:
1. Recall the definition or classification first and eliminate options that contradict it. Check the answer against a standard example.

Question 13: Match Column-I with Column-II. A liquid dispersed in gas, B gas dispersed in liquid, C liquid dispersed in solid, D liquid dispersed in liquid. P foam, Q emulsion, R aerosol, S gel.
(a) A–R, B–P, C–S, D–Q
(b) A–P, B–Q, C–R, D–S
(c) A–S, B–R, C–Q, D–P
(d) A–Q, B–R, C–P, D–S
Show Answer & Explanation

Answer: (a) A–R, B–P, C–S, D–Q

Explanation:
1. Liquid in gas is an aerosol and gas in liquid is a foam.
2. Liquid in solid is a gel and liquid in liquid is an emulsion.
3. Answer: (a)

Teacher's Note:
1. Recall the definition or classification first and eliminate options that contradict it. Check the answer against a standard example.

Question 14: Match Column-I with Column-II. A coagulation, B electrophoresis, C Tyndall effect, D Brownian movement. P due to presence of charge; Q due to scattering of light; R due to neutralisation of charge; S due to impact of the molecules of the dispersion medium with colloidal particles.
(a) A–R, B–P, C–Q, D–S
(b) A–P, B–Q, C–R, D–S
(c) A–S, B–Q, C–P, D–R
(d) A–S, B–P, C–Q, D–R
Show Answer & Explanation

Answer: (a) A–R, B–P, C–Q, D–S

Explanation:
1. Coagulation happens when the charge on particles is neutralised.
2. Electrophoresis arises from charge, the Tyndall effect from light scattering, and Brownian motion from molecular impacts.
3. Answer: (a)

Teacher's Note:
1. Recall the definition or classification first and eliminate options that contradict it. Check the answer against a standard example.

Question 15: For the coagulation of 50 mL of ferric hydroxide sol, 10 mL of 0.5 M KCl is required. What is the coagulation value of KCl (in millimoles per litre of sol)?
(a) 5
(b) 10
(c) 100
(d) none of these
Show Answer & Explanation

Answer: (c) 100

Explanation:
1. KCl used = 10 × 0.5 = 5 millimoles.
2. Per litre of sol: 5 × (1000/50) = 100 millimoles/litre.
3. Answer: (c)

Teacher's Note:
1. Recall the definition or classification first and eliminate options that contradict it. Check the answer against a standard example.

Question 16: Which of the following is true in respect of chemical adsorption?
(a) ΔH < 0, ΔS > 0, ΔG > 0
(b) ΔH < 0, ΔS < 0, ΔG < 0
(c) ΔH > 0, ΔS > 0, ΔG > 0
(d) ΔH > 0, ΔS < 0, ΔG > 0
Show Answer & Explanation

Answer: (b) ΔH < 0, ΔS < 0, ΔG < 0

Explanation:
1. Adsorption is spontaneous (ΔG < 0) and exothermic (ΔH < 0).
2. The gas loses freedom on the surface, so ΔS < 0.
3. Answer: (b)

Teacher's Note:
1. Recall the definition or classification first and eliminate options that contradict it. Check the answer against a standard example.

Question 17: Which of the following is a negatively charged sol?
(a) metallic sulphides
(b) Pt
(c) acid dye
(d) all of these
Show Answer & Explanation

Answer: (d) all of these

Explanation:
1. Metal sulphide sols, platinum and gold sols and acid dyes carry a negative charge.
2. So all of these are negatively charged.
3. Answer: (d)

Teacher's Note:
1. Recall the definition or classification first and eliminate options that contradict it. Check the answer against a standard example.

Question 18: In the Freundlich adsorption isotherm the value of 1/n is:
(a) 1 in case of physical adsorption
(b) 1 in case of chemisorption
(c) between 0 and 1 in all cases
(d) between 2 and 4 in all cases
Show Answer & Explanation

Answer: (c) between 0 and 1 in all cases

Explanation:
1. The isotherm is x/m = kP1/n with n > 1.
2. So 1/n always lies between 0 and 1.
3. Answer: (c)

Teacher's Note:
1. Recall the definition or classification first and eliminate options that contradict it. Check the answer against a standard example.

Question 19: The Langmuir adsorption isotherm is deduced using the assumption:
(a) the adsorption sites are equivalent in their ability to adsorb the particles
(b) the heat of adsorption varies with adsorption
(c) the adsorbed molecules interact with each other
(d) the adsorption takes place in multilayers
Show Answer & Explanation

Answer: (a) the adsorption sites are equivalent in their ability to adsorb the particles

Explanation:
1. Langmuir assumed a homogeneous surface of equivalent sites with monolayer adsorption.
2. He assumed no interaction between adsorbed molecules and a constant heat of adsorption.
3. Answer: (a)

Teacher's Note:
1. Recall the definition or classification first and eliminate options that contradict it. Check the answer against a standard example.

Question 20: Which of the following factors affects the adsorption of a gas on a solid?
(a) critical temperature (Tc)
(b) temperature of the gas
(c) pressure of the gas
(d) all of these
Show Answer & Explanation

Answer: (d) all of these

Explanation:
1. Easily liquefiable gases (higher Tc) are adsorbed more.
2. Adsorption also depends on temperature and pressure.
3. Answer: (d)

Teacher's Note:
1. Recall the definition or classification first and eliminate options that contradict it. Check the answer against a standard example.

Question 21: As the temperature increases, the extent of physisorption of a gas:
(a) increases
(b) decreases
(c) first increases then decreases
(d) remains unchanged
Show Answer & Explanation

Answer: (b) decreases

Explanation:
1. Physisorption is exothermic and held by weak forces.
2. Raising the temperature favours desorption, so the extent decreases.
3. Answer: (b)

Teacher's Note:
1. Recall the definition or classification first and eliminate options that contradict it. Check the answer against a standard example.

Question 22: Match the expressions in Column-I with the graphs or statements in Column-II. (A) x/m versus P; (B) log(x/m) versus log P; (C) x/m = KC1/n. (P) a straight line with slope 1/n and intercept log K; (Q) a curve that rises and levels off with pressure; (R) adsorption from the solution phase.
(a) A–P, B–Q, C–R
(b) A–Q, B–P, C–R
(c) A–R, B–P, C–Q
(d) A–R, B–Q, C–P
Show Answer & Explanation

Answer: (b) A–Q, B–P, C–R

Explanation:
1. x/m against P is a curve that levels off at high pressure (Q).
2. log(x/m) against log P is a straight line of slope 1/n (P); x/m = KC1/n is the form used for adsorption from solution (R).
3. Answer: (b)

Teacher's Note:
1. Recall the definition or classification first and eliminate options that contradict it. Check the answer against a standard example.

Question 23: Which of the following is a purification method of a colloidal solution?
(a) coagulation
(b) ultrafiltration
(c) electrophoresis
(d) Tyndall effect
Show Answer & Explanation

Answer: (b) ultrafiltration

Explanation:
1. Ultrafiltration separates colloidal particles from dissolved impurities using special filters.
2. Coagulation destroys the sol, and electrophoresis and the Tyndall effect are properties, not purification methods.
3. Answer: (b)

Teacher's Note:
1. Recall the definition or classification first and eliminate options that contradict it. Check the answer against a standard example.

Question 24: Which of the following statements is incorrect regarding physisorption?
(a) it occurs because of van der Waals forces
(b) easily liquefiable gases are adsorbed readily
(c) under high pressure it may result in multilayered adsorption on the adsorbent surface
(d) enthalpy of adsorption is positive
Show Answer & Explanation

Answer: (d) enthalpy of adsorption is positive

Explanation:
1. Adsorption is always exothermic, so the enthalpy of adsorption is negative.
2. The other three statements are correct.
3. Answer: (d)

Teacher's Note:
1. Recall the definition or classification first and eliminate options that contradict it. Check the answer against a standard example.

Question 25: When the temperature is lowered and pressure is raised, the adsorption of a gas on a solid:
(a) decreases
(b) increases
(c) remains unaffected
(d) decreases first and then increases
Show Answer & Explanation

Answer: (b) increases

Explanation:
1. Adsorption is exothermic, so low temperature favours it.
2. Higher pressure also increases the amount adsorbed.
3. Answer: (b)

Teacher's Note:
1. Recall the definition or classification first and eliminate options that contradict it. Check the answer against a standard example.

Question 26: The heat evolved in physisorption lies in the range (in kJ/mol) of:
(a) 20–40
(b) 40–100
(c) 100–200
(d) 200–400
Show Answer & Explanation

Answer: (a) 20–40

Explanation:
1. Physisorption involves weak van der Waals forces.
2. Its enthalpy change is only about 20–40 kJ mol−1.
3. Answer: (a)

Teacher's Note:
1. Recall the definition or classification first and eliminate options that contradict it. Check the answer against a standard example.

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