Question

In certain investigatory project 150 ml of water is taken in each of four beakers A B, C and D. Beaker A and B are maintained at temperature 25° C while C and D are maintained at temperature 65° C. Four crystals of copper sulphate of approximately same mass are taken and two of them are ground into powdered form. Now crystals are added in A and C while powdered form of the salt are added in a beaker B and D respectively.

Q1 in which beaker the intermixing will be quickest?
a) C
b)D
c)A
d) B

Q2 Rate of intermixing will be:
a) Same in A and C
b) Same in A and B
c) Quicker in B than in A
d) slower in C as compared to that in A

Q3 Colour of solution after intermixing is called
a) Greenish
b) bluish
c) pinkish
d) violet

Q4 Phenomenon responsible for intermixing is called
a) Diffusion of solid into liquid
b) Diffusion of liquid into solid
c)Osmosis
d) Sedimentation

Answer 1

1.b) D

2.c) quicker in B than A

3.b) bluish

4.b) diffusion of liquid into solid

Explanation:

a) As in beaker D , we have powdered copper sulphate and temperature as high as 65 degree Celsius. Both of these factors enhance the rate of diffusion.

b) In both beaker A and B, temperature is same but In B we have powdered copper sulphate which is easy to diffuse rather than its crystal form so diffusion slows down in A