Surface chemistry practice · Mixed difficulty

In which of the following reactions colloids are not prepared by the double decomposition method?

In the formation of $\mathrm{S}{\mathrm{O}_3}$ by $\mathrm{S}{\mathrm{O}_2}$ and ${\mathrm{O}_2}$ using NO as catalyst, the catalytic action of $\mathrm{N}{\mathrm{O}_2}$ is evidenced by :

Alumns purify muddy water by

Emulsions of polyvinylacetate are used in :

One desires to prepare a positively charged sol of silver iodide. This can be achieved by

Kraft temperature is the temperature

At CMC (critical micelle concentration), the surfactant molecules undergo

Reducing fog is mixture of

A catalyst is most effective in finely divided state because

$1 \mathrm{~g}$ of charcoal adsorbs $100 \mathrm{~mL} \,0.5 \,\mathrm{MCH}_3 \mathrm{COOH}$ to form a monolayer, and thereby the molarity of $\mathrm{CH}_3 \mathrm{COOH}$ reduces to 0.49. Calculate the surface area of the charcoal covered by each molecule of acetic acid. Surface area of charcoal $=3.01 \times 10^2 \mathrm{~m}^2 / \mathrm{g}$.

The outcome of internal liquid of gels on shear is called :

Freundlich adsorption isotherm is

The migration of colloidal particles under the influence of an electric field is known as

Emulsion is a colloidal solution of

An increase in the concentration of adsorbate at the surface relative to its concentration in bulk phase is called :

According to Langmuir adsorption isotherm the amount of gas adsorbed at very high pressure :

A negatively charged sol can be formed by peptizing a solutions of

Freundlich adsorption isotherm is given by the expression $\frac{x}{m} = KP{\,^{1/n}}$, which of the following conclusions can be drawn from this expression.
a) When, $\frac{1}{n} = 0$, the adsorption is independent of pressure
b) When, $\frac{1}{n} = 0$, the adsorption is directly proportional to pressure
c) When, $n = 0,{\mkern 1mu} \frac{x}{m}\,\,VS$ P graph is a line parallel to x-axis
d) When, n = 0, plot of $\frac{x}{m}VS\,\,\,P$ is a curve

For the coagulation of methylene blue sol, the flocculating power of which of the following ion is maximum ?

Which is an example of auto-catalyst?

Adsorption is accompanied by the evolution of heat. So, according to Le-Chatelier principle the amount of substance adsorbed should

On adding $\left| m \right|$ solution of 10 % NaCl to 10 ml gold Sol in presence of 0.25 g starch so that coagulation is just prevented, what will be gold number of starch

Which is a homogeneous system?

The substance that gets adsorbed on the surface of solid is called

A curve showing the variation of pressure with temperature for a given amount of adsorption is called

Assertion: Whipped cream is a colloid.

Reason: Whipped cream is a foam, which is a liquid dispersed in a gas.

The Langmuir adsorption isotherm is deduced using the assumption

Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) Photochemical smog causes cracking of rubber.
Reason (R) Presence of ozone, nitric oxide, acrolein, formaldehyde and peroxyacetyl nitrate in photochemical smog makes it oxidising.
Choose the most appropriate answer from the options given below.

Which of the following reactions lead to the formation of colloidal solution?

Which one of the following equation represents Freundlich adsorption isotherm?