Surface Chemistry

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

[Re-NEET 2020]

The charges on the colloidal \( \mathrm{CdS} \) sol and \( \mathrm{TiO}_{2} \) sol are, respectively

[JEE Main 2021, 18 Mar (Shift 2)]

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

[JEE Main 2023, 24 Jan (Shift 1)]

As per Hardy-Schulze formulation, the flocculation values of the following for ferric hydroxide sol are in the order

[JEE Main 2020, 8 Jan (Shift 1)]

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

[NEET 2021]

When silver nitrate solution is added to potassium iodide solution, then the sol produced is

[JEE Main 2021, 22 Jul (Shift 2)]

The tyndall effect is observed only when following conditions are satisfied:
(a) The diameter of the dispersed particles is much smaller than the wavelength of the light used.
(b) The diameter of the dispersed particle is not much smaller than the wavelength of the light used.
(c) The refractive indices of the dispersed phase and dispersion medium are almost similar in magnitude.
(d) The refractive indices of the dispersed phase and the dispersion medium differ greatly in magnitude.

[JEE Main 2020, 3 Sep (Shift 1)]

The condition given below are in the context of observing Tyndall effect in colloidal solutions

(A) The diameter of the colloidal particle is comparable to the wavelength of the light used.

(B) The diameter of the colloidal particle is much smaller than the wavelength of the light used.

(C) The diameter of the colloidal particle is much larger than the wavelength of the light used.

(D) The refractive indices of the dispersed phase and dispersion medium are comparable.

(E) The dispersed phase has very different refractive indiex from the dispersion magnitude.

What happens when a lyophilic sol is added to a lyophobic sol?

Kraft temperature is the temperature

[JEE Main 2020, 6 Sep (Shift 1)]

Ferric chloride is applied to stop bleeding because

[JEE Main 2023, 10 Apr (Shift 2)]

Match List I with List II:

\(\begin{matrix} & \begin{matrix}\text{ List-I } \\ \text{ Example of } \\ \text{ colloids }\end{matrix} & & \begin{matrix}\text{ List - II } \\ \text{ Classification of colloids}\end{matrix} \\ \text{ (a) } & \text{ Cheese } & \text{ (i) } & \begin{matrix}\text{ dispersion of liquid in } \\ \text{ liquid }\end{matrix} \\ \text{ (b) } & \text{ Pumice stone } & \text{ (ii) } & \begin{matrix}\text{ dispersion of liquid in } \\ \text{ gas }\end{matrix} \\ \text{ (c) } & \text{ Hair cream } & \text{ (iii) } & \begin{matrix}\text{ dispersion of gas in } \\ \text{ solid }\end{matrix} \\ \text{ (d) } & \text{ Cloud } & \text{ (iv) } & \begin{matrix}\text{ dispersion of liquid in } \\ \text{ solid }\end{matrix}\end{matrix}\)

Match List-I and List-II.

Choose the correct answer from the options given below

[JEE Main 2023, 29 Jan (Shift 2)]

The flocculation value of \( \mathrm{HCl} \) for arsenic sulphide sol. is \( 30 \mathrm{~m} \mathrm{mol} \mathrm{~L}^{-1} \). if \( \mathrm{H}_{2} \mathrm{SO}_{4} \) is used for the flocculation of arsenic sulphide, the amount, in grams, of \( \mathrm{H}_{2} \mathrm{SO}_{4} \) in 250\( \mathrm{~ml} \) required for the above purpose is

(Molecular mass of \( \mathrm{H}_{2} \mathrm{SO}_{4}=98 \mathrm{~g} / \mathrm{mol} \) )

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

[NEET 2020]

Which of the following salt solutions would coagulate the colloid soloution formed when \(\mathrm{FeCl _3}\) is added to \(\mathrm{NaOH}\) solution, at the fastest rate?

[JEE Main 2023, 29 Jan (Shift 1)]

Which of the following is used for the preparation of colloids?

What will be nature of charge on colloidal particle when \( \mathrm{FeCl}_{3} \) is added to excess of hot water?

\(CO _2\) gas adsorbs on charcoal following Freundlich adsorption isotherm. For a given amount of charcoal, the mass of \(CO _2\) adsorbed becomes 64 times when the pressure of \(CO _2\) is doubled. The value of \(n\) in the Freundlich isotherm equation is ________\(\times 10^{-2}\) (Round off to the nearest integer) \(\left[ R =0.0821 L atm K ^{-1} mol ^{-1}\right] \quad\)

[JEE Main 2021, 27 Jul (Shift 1)]

Match List-I with List-II.

Choose the correct answer from the options given below:

[JEE Main 2023, 31 Jan (Shift 2)]

The conditions given below are in the context of observing Tyndall effect in colloidal solutions:
(A) The diameter of the colloidal particles is comparable to the wavelength of light used.
(B) The diameter of the colloidal particles in 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.

[JEE Main 2021, 20 Jul (Shift 1)]

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?

[JEE Main 2023, 29 Jan (Shift 1)]

The tyndall effect is observed only when following conditions are satisfied

(a) The diameter of the dispersed particles is much smaller than the wavelength of the light used.
(b) The diameter of the dispersed particle is not much smaller than the wavelength of the light used.
(c) The refractive indices of the dispersed phase and dispersion medium are almost similar in magnitude.
(d) The refractive indices of the dispersed phase and the dispersion medium differ greatly in magnitude.

[JEE Main 2020, 3 Sep (Shift 1)]

In Freundlich adsorption isotherm at moderate pressure, the extent of adsorption \( \left(\frac{\mathrm{x}}{\mathrm{m}}\right) \) is directly proportional to \( \mathrm{P}^{\mathrm{x}} \). The value of \( x \) is

[JEE Main 2021, 25 Feb (Shift 1)]

Which of the following salt solutions would coagulate the colloid soloution formed when \(FeCl _3\) is added to \(NaOH\) solution, at the fastest rate?

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:

[JEE Main 2023, 13 Apr (Shift 2)]

The aggregation number of a surfactant depends on the nature of surfactant used. Which type of ion form micelle in case of \({\mathrm{RSO}}_{4}\mathrm{Na}\)?

[JEE Main 2023, 31 Jan (Shift 1)]

Lyophilic sols are more stable than lyophobic sols because :

[JEE Main 2021, 27 Aug (Shift 2)]