The adsorbent used in adsorption chromatography is/are -
A. silica gel
B. alumina
C. quick lime
D. magnesia
Choose the most appropriate answer from the options given below :
'Adsorption' principle is used for which of the following purification method?
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : The diameter of colloidal particles in solution should not be much smaller than wavelength of light to show Tyndall effect.
Reason R : The light scatters in all directions when the size of particles is large enough.
In the light of the above statements, choose the correct answer from the options given below:
What happens when a lyophilic sol is added to a lyophobic sol?
Four gases A, B, C and D have critical temperatures $5.3,33.2,126.0$ and $154.3 \mathrm{~K}$ respectively. For their adsorption on a fixed amount of charcoal, the correct order is:
Ferric chloride is applied to stop bleeding because -
The enthalpy change for the adsorption process and micelle formation respectively are
Which of the following represent the Freundlich adsorption isotherms?
Choose the correct answer from the options given below:
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 $\mathrm{He}, \mathrm{Ne}, \mathrm{Ar}$ and $\mathrm{Kr}$; 1$\mathrm{g}$ of activated charcoal adsorbs more of $\mathrm{Kr}$.
Reason R: The critical volume $\mathrm{V}_{\mathrm{c}}\left(\mathrm{cm}^{3} \mathrm{~mol}^{-1}\right)$ and critical pressure $\mathrm{P}_{\mathrm{c}}$ (atm) is highest for Krypton but the compressibility factor at critical point $\mathrm{Z}_{\mathrm{c}}$ is lowest for Krypton.
In the light of the above statements, choose the correct answer from the options given below
Match List I with List II
| LIST I | LIST II | ||
|---|---|---|---|
| A. | Physisorption | I. | Single Layer Adsorption |
| B. | Chemisorption | II. | $20-40 \mathrm{~kJ} \mathrm{~mol}^{-1}$ |
| C. | $\mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g}) \stackrel{\mathrm{Fe}(\mathrm{s})}{\longrightarrow} 2 \mathrm{NH}_{3}(\mathrm{~g})$ | III. | Chromatography |
| D. | Analytical Application or Adsorption | IV. | Heterogeneous catalysis |
Choose the correct answer from the options given below:
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 instruments, silica gel is kept in watch-glasses or in semipermeable membrane bags.
Reason (R) : Silica gel adsorbs moisture from air via adsorption, thus protects the instrument from water corrosion (rusting) and / or prevents malfunctioning.
In the light of the above statements, choose the correct answer from the options given below :
Match List I and List II
| List I | List II | ||
|---|---|---|---|
| A. | Osmosis | I. | Solvent molecules pass through semi permeable membrane towards solvent side. |
| B. | Reverse osmosis | II. | Movement of charged colloidal particles under the influence of applied electric potential towards oppositely charged electrodes. |
| C. | Electro osmosis | III. | Solvent molecules pass through semi permeable membrane towards solution side. |
| D. | Electrophoresis | IV. | Dispersion medium moves in an electric field. |
Choose the correct answer from the options given below :
Which of the following salt solutions would coagulate the colloid solution formed when $\mathrm{FeCl_3}$ is added to $\mathrm{NaOH}$ solution, at the fastest rate?
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 concentration.
Statement II : For colloidal particles, the potential difference between the fixed layer and the diffused layer of same charges is called the electrokinetic potential or zeta potential.
In the light of the above statements, choose the correct answer from the options given below
Given below are the critical temperatures of some of the gases:
| Gas | Critical temperature (K) |
|---|---|
| He | 5.2 |
| CH$_4$ | 190.0 |
| CO$_2$ | 304.2 |
| NH$_3$ | 405.5 |
The gas showing least adsorption on a definite amount of charcoal is
$100 \mathrm{~mL}$ of $5 \%\,(\mathrm{w} / \mathrm{v})$ solution of $\mathrm{NaCl}$ in water was prepared in $250 \mathrm{~mL}$ beaker. Albumin from the egg was poured into $\mathrm{NaCl}$ solution and stirred well. This resulted in a/an :
Match List - I with List - II.
| List - I Reaction |
List - II Catalyst |
||
|---|---|---|---|
| (A) | $4N{H_3}(g) + 5{O_2}(g) \to 4NO(g) + 6{H_2}O(g)$ | (I) | $NO(g)$ |
| (B) | ${N_2}(g) + 3{H_2}(g) \to 2N{H_3}(g)$ | (II) | ${H_2}S{O_4}(l)$ |
| (C) | ${C_{12}}{H_{22}}{O_{11}}(aq) + {H_2}O(l) \to \mathop {{C_6}{H_{12}}{O_6}}\limits_{Glu\cos e} + \mathop {{C_6}{H_{12}}{O_6}}\limits_{Fructose} $ | (III) | $Pt(s)$ |
| (D) | $2S{O_2}(g) + {O_2}(g) \to 2S{O_3}(g)$ | (IV) | $Fe(s)$ |
Choose the correct answer from the options given below :
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 removed from a colloidal solution by diffusion through a parchment paper.
Reason (R) : Particles in a true solution cannot pass through parchment paper but the colloidal particles can pass through the parchment paper.
In the light of the above statements, choose the correct answer from the options given below :
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Finest gold is red in colour, as the size of the particles increases, it appears purple then blue and finally gold.
Reason R : The colour of the colloidal solution depends on the wavelength of light scattered by the dispersed particles.
In the light of the above statements, choose the most appropriate answer from the options given below.
For micelle formation, which of the following statements are correct?
A. Micelle formation is an exothermic process.
B. Micelle formation is an endothermic process.
C. The entropy change is positive.
D. The entropy change is negative.
TLC analysis of a mixture having 3 components (A, B, C) using silica gel as the stationary phase gave following Rf values; for A = 0.72, B = 0.48, C = 0.20.
Regarding the above observations, which one of the following statements is not correct for column chromatography of the mixture?
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 : Molar mass : Na = 23.0 g mol$-$1 ; Cl = 35.5 g mol$-$1]
Which of the following is a correct statement?
Match List - I with List - II :
| List-I | List-II | ||
|---|---|---|---|
| (A) | negatively charged sol | (I) | $F{e_2}{O_3}\,.\,x{H_2}O$ |
| (B) | macromolecular colloid | (II) | CdS sol |
| (C) | positively charged sol | (III) | Starch |
| (D) | Cheese | (IV) | a gel |
Choose the correct answer from the options given below:
The Zeta potential is related to which property of colloids?
Match List-I with List-II
| List - I | List - II | ||
|---|---|---|---|
| (A) | Lyophilic colloid | (I) | Liquid-liquid colloid |
| (B) | Emulsion | (II) | Protective colloid |
| (C) | Positively charged colloid | (III) | FeCl$_3$ + NaOH |
| (D) | Negatively charged colloid | (IV) | FeCl$_3$ + hot water |
Choose the correct answer from the options given below :
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.
Statement II : For stabilisation of an emulsion, excess of electrolyte is added.
In the light of the above statements, choose the most appropriate answer from the options given below :
Choose the most appropriate answer from the options given below.
(x - mass of the gas absorbed ; m - mass of adsorbent ; P - pressure)
| List-I Example of colloids |
List - II Classification |
|---|---|
| (a) Cheese | (i) dispersion of liquid in liquid |
| (b) Pumice stone | (ii) dispersion of liquid in gas |
| (c) Hair cream | (iii) dispersion of gas in solid |
| (d) Cloud | (iv) dispersion of liquid in solid |
Choose the most appropriate answer from the options given below
(A) The diameter of the colloidal particles is comparable to the wavelength of light used.
(B) The diameter of the colloidal particles is much smaller than the wavelength of light used.
(C) The diameter of the colloidal particles is much larger than the wavelength of light used.
(D) The refractive indices of the dispersed phase and the dispersion medium are comparable.
(E) The dispersed phase has a very different refractive index from the dispersion medium.
Choose the most appropriate conditions from the options given below :
