Class 12th

This is a Assertion and Reason Type Questions as classified in NCERT Exemplar

Ans: Colloidal particles being bigger aggregates, the number of particles in a colloidal solution is comparatively small as compared to a true solution. Hence, the values of colligative properties (osmotic pressure, lowering in vapour pressure, depression in freezing point and elevation in boiling point) are of small order as compared to values shown by true solutions at same concentration hence the answer is (i).

This is a Assertion and Reason Type Questions as classified in NCERT Exemplar

Ans: Colloidal particles can pass through ordinary filter paper because the pores are too large. However, the pores of filter paper can be reduced in size by impregnating with collodion solution to stop the flow of colloidal particles hence the answer is (iii).

This is a Matching Type Questions as classified in NCERT Exemplar

Ans: The answers are: (i)- (d) (ii)- (c) (iii)- (a) (iv)- (b)

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).