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
Answers
Answer:
Q1) Option b) D will be the correct answer.
Q2) Option c) Quicker in B than in A.
Q3) Option b) Bluish.
Q4) Option b) Diffusion of liquid into solid.
Explanation:
Q1) Option b) D will be the correct answer.
- As we have powdered copper sulphate and temperatures as high as 65 degrees Celsius in beaker D.
- Both of these factors will facilitate in accelerating diffusion.
Q2) Option c) Quicker in B than in A.
- The temperature is the same in both beakers A and B
- But in B we have powdered copper sulphate, which is easier to diffuse than crystal copper sulphate, therefore diffusion is slower in beaker A.
Q3) Option b) Bluish.
Color of solution after mixing will appear Bluish due to the presence of Copper sulphate.
Q4) Option b) Diffusion of liquid into solid.
The Phenomenon responsible for intermixing is called Diffusion of liquid into solid. As the rate of diffusion increases as the temperature of the dispersing substance rises. Diffusion is the quickest in gases and the least efficient in solids.
Answer:
1. option b
2. option c
3. option b
4. option b