Question

Answer these MCQs quickly? Plz?

1) Glass beads in column provides _____________ for repeated condensations

A. more density
B. less mass
C. large surface area
D. Less friction

2) Kerosene oil, water and salt can be separated by;

A. separating funnel followed by evaporation

B. evaporation followed by separating funnel

C. sublimation followed by evaporation

D.separating funnel followed by filtration

3) A mixture of ZnCl2 and PbCl2 can be separated by:

A. Distillation
B.Crystallization
C. Sublimation
D. Adding acetic acid

4) Distillation is a good separation technique for:

A. Solids
B. Liquids
C. Solid alloys
D. Gases

5) A mixture of sulphur and carbon disulphide is

A. heterogeneous and shows Tyndall effect

B. homogeneous and shows Tyndall effect

C. heterogeneous and does not show Tyndall effect

D. homogeneous and does not show Tyndall effect

6) Identify the shown apparatus:

A. Distillating column
B. Fractionating column
C. Evaporating column
D. Centrifugating column

7) Mercury and water can be seperated by ;

A. separating funnel
B. distillation
C. sublimation
D. chromatography

8) A mixture of ethanol and water ca be separated by:

A. Filtration
B. Decantation
C. Fractional distillation
D. Sublimation

9) A mixture of methyl alcohol and acetone can be separated by:

A. Distillation
B. Fractional distillation
C. Steam distillation
D. Distillation under reduced pressure

10) Two substances, A and B were made to react to form a third substance, A2B according to the following reaction 2A + B → A2B which of the following statements concerning this reaction are incorrect?

(i) The product A2B shows the properties of substances A and B

(ii) The product will always have a fixed composition

(iii) The product so formed cannot be classified as a compound

(iv) The product so formed is an element

A. (i), (ii) and (iii),

B. (ii), (iii) and (iv)

C. (i), (iii) and (iv)

D. (ii), (iii) and (iv)

Answer 1

Answer:

1a2c 3b 4d 5a6c7c8b9d10a