JEE Main
Chemistry
Surface Chemistry
Previous Years Questions

In figure, a straight line is given for Freundrich Adsorption ($$y=3x+2.505$$). The value of $$\frac{1}{n}$$ and $$\log \mathrm{K}$$ are respectively....
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R Assertion A: Amongst $$\mathrm{He}, \mathrm{Ne}, ... Match List I with List II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family... Adding surfactants in non polar solvent, the micelles structure will look like ... Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : In expensive scientific ins... Match List I and List II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:... Which of the following salt solutions would coagulate the colloid solution formed when$$\mathrm{FeCl_3}$$is added to$$\mathrm{NaOH}$$solution, at ... The variation of the rate of an enzyme catalyzed reaction with substrate concentration is correctly represented by graph ... Statement I : For colloidal particles, the values of colligative properties are of small order as compared to values shown by true solutions at same c... Given below are the critical temperatures of some of the gases: .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-st...$$100 \mathrm{~mL}$$of$$5 \%\,(\mathrm{w} / \mathrm{v})$$solution of$$\mathrm{NaCl}$$in water was prepared in$$250 \mathrm{~mL}$$beaker. Albumi... Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R Assertion A : Thin layer chromatography is an ads... Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Dissolved substances can be... For micelle formation, which of the following statements are correct? A. Micelle formation is an exothermic process. B. Micelle formation is an endoth... A 42.12% (w/v) solution of NaCl causes precipitation of a certain sol in 10 hours. The coagulating value of NaCl for the sol in 2 hours is : [Given : ... Which of the following is a correct statement? Match List - I with List - II : .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-... The Zeta potential is related to which property of colloids? Which one of the following techniques is not used to spot components of a mixture separated on thin layer chromatographic plate? Match List-I with List-II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family... Incorrect statement for Tyndall effect is : Using very little soap while washing clothes, does not serve the purpose of cleaning of clothes, because : Given below are two statements : Statement I : Emulsions of oil in water are unstable and sometimes they separate into two layers on standing. Stateme... Match List - I with List - II : Choose the most appropriate answer from the options given below.... Select the graph that correctly describes the adsorption isotherms at two temperatures T1, and T2 (T1 > T2) for a gas :(x - mass of the gas absorbe... Lyophilic sols are more stable than lyophobic sols because : Acidic ferric chloride solution on treatment with excess of potassium ferrocyanide gives a Prussian blue coloured colloidal species. It is : Tyndall effect is more effectively shown by : The sol given below with negatively charged colloidal particles is : Which one of the following is correct for the adsorption of a gas at a given temperature on a solid surface? Match List I with List II : List-IExample of colloids List - IIClassification (a) Cheese (i) dispersion of liquid in liqui... The conditions given below are in the context of observing Tyndall effect in colloidal solutions :(A) The diameter of the colloidal particles is compa... The charges on the colloidal CdS sol and TiO2 sol are, respectively :$${C_{12}}{H_{22}}{O_{11}} + {H_2}O\buildrel {Enzyme\,A} \over \longrightarrow \mathop {{C_6}{H_{12}}{O_6}}\limits_{Glu\cos e} + \mathop {{C_6}{H_{1...
For the coagulation of a negative sol, the species below, that has the highest flocculating power is :
A colloidal system consisting of a gas dispersed in a solid is called a/an :
The INCORRECT statements below regarding colloidal solutions is :
The nature of charge on resulting colloidal particles when FeCl3 is added to excess of hot water is :
Which one of the following statements is FALSE for hydrophilic sols?
In Freundlich adsorption isotherm at moderate pressure, the extent of adsorption $$\left( {{x \over m}} \right)$$ is directly proportional to Px. The ...
In Freundlich adsorption isotherm, slope of AB line is : ...
Kraft temperature is the temperature :
Adsorption of a gas follows Freundlich adsorption isotherm. If x is the mass of the gas adsorbed on mass m of the adsorbent, the correct plot of $${x ... An Ellingham diagram provides information about : Identify the correct molecular picture showing that happens at the critical micellar concentration (CMC) of an aqueous solution of a surfactant ( ◍ po... A sample of red ink (a colloidal suspension) is prepared by mixing eosin dye, egg white, HCHO and water. The component which ensures stability of the ... An ionic micelle is formed on the addition of : Tyndall effect is observed when: Amongst the following statements regarding adsorption, those that are valid are (a)$$\Delta $$H becomes less negative as adsorption proceeds (b) On a... Which of the following is used for the preparation of colloids? A mixture of gases O2, H2 and CO are taken in a closed vessel containing charcoal. The graph that represents the correct behaviour of pressure with ti... For the following Assertion and Reason, the correct option is Assertion : For hydrogenation reactions, the catalytic activity increases from Group 5 t... As per Hardy-Schulze formulation, the flocculation values of the following for ferric hydroxide sol are in the order : Among the following, the INCORRECT statement about colloids is : Peptization is a : The correct option among the following is : In chromatography, which of the following statements is incorrect for Rf ? A gas undergoes physical adsorption on a surface and follows the given Freundlich adsorption isotherm equation$${x \over m} = k{p^{0.5}}$$Adsorption... The aerosol is a kind of colloid in which : Match the catalysts (Column I) with products (Column II). .tg {border-collapse:collapse;border-spacing:0;width:100%} .tg td{font-family:Arial, sans-... Adsorption of a gas follows freundlich adosorbed isotherm. x is the mass of the gas adsorbed on mass m of the adsorbent. The plot log$$x \over m$$ve... Among the following the false statement is - Given .tg {border-collapse:collapse;border-spacing:0;border:none;} .tg td{font-family:Arial, sans-serif;font-size:14px;padding:10px 5px;border-style... Among the colloids cheese (C), milk (M), and smoke (S), the correct combination of the dispersed phase and dispersion medium, respectively is : An example of solid sol is : Haemoglobin and gold sol are examples of : For coagulation of arsenious sulphate sol, which one of the following salt solution will be most effective ? Adsorption of a gas follows Freundlich adsorption isotherm. In the given plot, x is the mass of the gas adsorbed on mass m of the adsorbent at pressu... Which one of the following is not a property of physical adsorption ? When metal ‘M’ is treated with NaOH, a white gelatinous precipitate ‘X’ is obtained, which is soluble in excess of NaOH. Compound ‘X’ when heated stro... If x gram of gas is adsorbed by m gram of adsorbent at pressure P, the plot of log$${x \over m}$$versus log P is linear. The slope of the plot is : ... Which of the following statements about colloids is False ? Adsorption of a gas on a surface follows Freundlich adsorption isotherm. Plot of log$${x \over m}$$versus log p gives a straight line with slope equ... Among the following, correct statement is : The Tyndall effect is observed only when following conditions are satisfied: (a) The diameter of the dispersed particles is much smaller than the wave... Gold numbers of some colloids are : Gelatin : 0.005 - 0.01, Gum Arabic : 0.15 - 0.25; Oleate : 0.04 - 1.0; Starch : 15 - 25. Which among these is a be... A particular adsorption process has the following characteristics : (i) It arises due to van der Waals forces and (ii) it is reversible. Identify the ... For a linear plot of log (x/m) versus log p in a Freundlich adsorption isotherm, which of the following statements is correct ? (k and n are constants... 3 g of activated charcoal was added to 50 mL of acetic acid solution (0.06N) in a flask. After an hour it was filtered and the strength of the filtrat... The coagulating power of electrolytes having ions Na+, Al3+ and Ba2+ for arsenic sulphide sol increases in the order: ... According to Freundlich adsorption isotherm, which of the following is correct ? Which of the following statements is incorrect regarding physisorptions ? Gold numbers of protective colloids A, B, C and D are 0.50, 0.01, 0.10 and 0.005, respectively. The correct order of their protective powers is In Langmuir’s model of adsorption of a gas on a solid surface The volume of a colloidal particle, VC as compared to the volume of a solute particle in a true solution VS, could be The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged, respectively, which of the following sta... Which one of the following characteristics is not correct for physical adsorption? The formation of gas at the surface of tungsten due to adsorption is the reaction of order ## Numerical The graph of \log \frac{x}{m} vs \log \mathrm{p} for an adsorption process is a straight line inclined at an angle of 45^{\circ} with intercept ... Following chromatogram was developed by adsorption of compound 'A' on a 6 cm TLC glass plate. Retardation factor of the compound 'A' is _________$$\t...
Based on the given figure, the number of correct statement/s is/are __________. A. Surface tension is the outcome of equal attractive and repulsive f...
The number of incorrect statement/s from the following is/are ___________ A. Water vapours are adsorbed by anhydrous calcium chloride. B. There is a d...
The number of statement/s which are the characteristics of physisorption is __________ A. It is highly specific in nature B. Enthalpy of adsorption is...
Among the following the number of curves not in accordance with Freundlich adsorption isotherm is ________. (a) (b) (c) (d) ...
100 mL of 0.3 M acetic acid is shaken with 0.8 g of wood charcoal. The final concentration of acetic acid in the solution after adsorption is 0.125 M....
If the initial pressure of a gas is 0.03 atm, the mass of the gas adsorbed per gram of the adsorbent is ___________ $$\times$$ 10$$-$$2 g....
When 200 mL of 0.2 M acetic acid is shaken with 0.6 g of wood charcoal, the final concentration of acetic acid after adsorption is 0.1 M. The mass of ...
CH4 is absorbed on 1g charcoal at 0$$^\circ$$C following the Freundlich adsorpiton isotherm 10.0 mL of CH4 is adsorbed at 100 mm of Hg, whereas 15.0 m...
CO2 gas adsorbs on charcoal following Freundlich adsorption isotherm. For a given amount of charcoal, the mass of CO2 adsorbed becomes 64 times when t...
100 ml of 0.0018% (w/v) solution of Cl$$-$$ ion was the minimum concentration of Cl$$-$$ required to precipitate a negative sol in one h. The coagulat...
For Freundlich adsorption isotherm, a plot of log (x/m) (y-axis) and log p (x-axis) gives a straight line. The intercept and slope for the line is 0.4...
The mass of gas adsorbed, x, per unit mass of adsorbate, m, was measured at various pressures, p. A graph between $$\log {x \over m}$$ and log p give...
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