Chap-6 Solutions                                

 

Objective Part

Choose the right option.                                                       10×1=10

 

A

B

C

D

1

Tyndall effect is due to:

Blockage of beam of light

Non scattering of beam of light

Scattering of beam of light

Passing through beam of light

2

Molarity is the number of moles of solute dissolved in:

1 kg of solution

100g of solvent

1 dm3 of solvent

1 dm3 of solution

3

Which one of the solution contains more water?

2 M

1 M

0.5 M

0.25 M

4

The emulsions are the type of solution:

Solid in solid

Liquid in liquid

Gas in liquid

None of above

5

Starch, glue are examples of:

Colloidal solution

Solution

Colloids

Crystalline

6

Fog is an example of solution:

Gas in liquid

Liquid in gas

Solid in liquid

Liquid in solid

7

The concentrate solution of NaCl is called:

Fluid

Brass

Brine

Plasma

8

Concentration is most often expressed as the ratio of amount of _______ to the amount of solution.

Solute

Solvent

Brine

Salt

9

Which one of the following is heterogenous mixture?

Milk

Ink

Milk of magnesia

Sugar solution

10

Tyndall effect is shown by:

Sugar solution

Paints

Jelly

Chalk solution

 

Subjective

Answer the short questions                                                                 10×2=20

1.      Define solvent and solute.

2.      Why we stir paints thoroughly before using?

3.      What do you mean by volume/volume %?

4.      Define solubility.

5.      Why test-tube becomes cold, when KNO3 is dissolved in water?

6.      What is difference between colloid and suspension?

7.      What is Tyndall effect and on what factors it depends?

8.      What is supersaturated solution?

9.      What are dilute and concentrated solutions?

10.  Define molarity. Give its formula and unit.

 

                                          Long Questions                5×1=5

(a) What is meant by concentration of a solution? Describe the different ways of expressing the percentage composition of solution.              3

(b) When we dissolve 20g of NaCl in 400cm3 of a solution, what will be its molarity?     2