Surface Chemistry

This is a Multiple Choice Type Questions as classified in NCERT Exemplar

Ans: Correct option is (iv).

Solid and liquid together forms up sol. In this case, solid is dispersed phase and liquid is the dispersion medium hence the answer is (iv).

This is a Multiple Choice Type Questions as classified in NCERT Exemplar

Ans: Correct option is (ii)

The rate of coagulation will be faster if the value of oppositely charge electrolyte is high hence the answer is (ii).

This is a Multiple Choice Type Questions as classified in NCERT Exemplar

Ans: Correct option is (iv)

Peptisation is the process in which freshly prepared precipitate can be converted into colloidal solution so the answer is (iv).

This is a Multiple Choice Type Questions as classified in NCERT Exemplar

Ans: Correct option is (iii).

Lyophilic colloids have unique property of protecting lyophobic colloids. When a lyophilic sol is added to lyophobic solution, the lyophilic particles form a layer around the lyophobic particles and protect the latter from electrolytes. Lyophilic colloids used for this purpose are called protective colloids hence the answer is (iii).

This is a Multiple Choice Type Questions as classified in NCERT Exemplar

Ans: Correct option is (ii).

Tyndall effect is defined as the optical property shown by colloidal particle. Above the critical micelle concentration, a solution of soap behaves as an associated colloid so it shows Tyndall effect hence the answer is (ii).

This is a Multiple Choice Type Questions as classified in NCERT Exemplar 

Ans: Correct option is (ii)

There are few substances which at low concentrations behave as normal strong electrolytes, but at higher concentrations exhibit colloidal behavior due to the formation of aggregates. The aggregated particles formed are called micelles. These are also known as associated colloids hence the answer is (ii).

This is a Multiple Choice Type Questions as classified in NCERT Exemplar

Ans: Correct option is (i)

When the reactant and catalyst are in different phase it is known as heterogeneous catalysis hence the answer is (i).

This is a Multiple Choice Type Questions as classified in NCERT Exemplar

Ans: Correct option is (iv)

Lesser the value of critical temperature of gases, the lesser will be the force of attraction among molecules and least will be the adsorption hence the answer is option (iv).

This is a Multiple Choice Type Questions as classified in NCERT Exemplar

Ans: Correct option is (iii)

In absorption, a substance is uniformly distributed, through the body of the solid or liquid, hence the correct option is (iii).

This is a Multiple Choice Type Questions as classified in NCERT Exemplar

Ans: Correct option is (i)

Physisorption adsorbent does not show specificity for any particular gas because it is involved van there Waals forces are universal, hence the correct option is (i).