Chemistry NCERT Exemplar Solutions Class 12th Chapter Five

This is a Matching Type Questions as classified in NCERT Exemplar

Ans: (i)- (d); (ii)- (c); (iii)- (a); (iv)- (b)

This is a Matching Type Questions as classified in NCERT Exemplar

Ans: (i) - (b); (ii) - (c); (iii) - (d); (iv) - (a)

This is a Matching Type Questions as classified in NCERT Exemplar

Ans: (i)- (b); (ii)- (c); (iii)- (d); (iv)- (a)

This is a Matching Type Questions as classified in NCERT Exemplar

Ans: (i)- (c); (ii)- (d); (iii)- (b); (iv)- (a)

This is a Matching Type Questions as classified in NCERT Exemplar

Ans : (i)- (b); (ii)- (c); (iii)- (d); (iv)- (a)

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

Ans: (i) and (iv)

When a chalk stick is dipped in ink, the surface retains the colour of the ink due to adsorption of coloured molecules

while the solvent of the ink goes deeper into the stick due to absorption so the answers are (i) and (iv).

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

Ans:  (i) and (ii)

Substances which accelerate the rate of a chemical reaction and themselves remain chemically and quantitatively unchanged after the reaction, are known as catalysts they can undergo physical change so the answers are (i) and (ii).

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

Ans:  (ii) and (iii).

When electrophoresis, i.e, movement of particles is prevented by some suitable means, it is observed that the dispersion medium begins to move in an electric field. This phenomenon is termed electroosmosis so the answers are (ii) and (iii).

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

Ans:  (i) and  (iii)

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

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

Ans:  (iii)  and  (iv)

Sols  directly  formed  by mixing substances  like  gum, gelatin,   starch, rubber, etc., with a  suitable liquid (the  dispersion 

medium) are  called lyophilic sols. They are  also known as  reversible colloid.  These sols  are  very stable  and cannot

coagulate easily hence the answers are (iii)  and  (iv).