WBBSE Class 9 Physical Science MCQ Questions Chapter 4.5 Separation of Mixtures

Well structured WBBSE Class 9 Physical Science MCQ Questions Chapter 4.5 Separation of Mixtures can serve as a valuable review tool before exams.

Separation of Mixtures Class 9 WBBSE MCQ Questions

Multiple Choice Questions :

Question 1.
Which metal is lighter than water ?
(i) Calcium
(ii) Mercury
(iii) Sodium
(iv) Gold
Answer:
Sodium

Question 2.
Which non-metal exists in liquid state at room temperature?
(i) Mercury
(ii) Bromine
(iii) Carbon
(iv) Sulphur
Answer:
Bromine

Question 3.
Which natural element is hardest ?
(i) Fullerine
(ii) Iron
(iii) Gold
(iv) Diamond
Answer:
Diamond

Question 4.
Name a substance whose properties are intermediate between metal and non-metal ?
(i) Germenium
(ii) Potassium
(iii) Iron
(iv) Carbon
Answer:
Germenium

Question 5.
Which gas has the smell of rotten egg?
(i) Ammonia
(ii) Sulphuretted hydrogen
(iii) Carbon dioxide
(iv) Oxygen
Answer:
Sulphuretted hydrogen.

Question 6.
What is the nature of aqueous solution of NaCl ?
(i) Acidic
(ii) Alkaline
(iii) Neutral
(iv) None of these.
Answer:
Neutral.

Question 7.
Cite an example where both physical and chemical changes occur ?
(i) Incomplete burning of candle.
(ii) Burning of a magnesium ribbon
(iii) Slaking of lime
(iv) Melting of ice.
Answer:
Incomplete burning of candle.

Question 8.
Name a non-metal that conducts heat and electricity ?
(i) Graphite
(ii) Sulphur
(iii) Diamond
(iv) Nitrogen
Answer:
Graphite

Question 9.
MnO₂ is a catalyst :
(i) positive
(ii) negative
(iii) both positive and negative
(iv) none of these
Answer: Positive

Question 10.
Heating of a platinum wire is a :
(i) physical change
(ii) chemical change
(iii) both physical and chemical change
(iv) none of these.
Answer:
Physical change

Question 11.
The boiling point of water is :
(i) 100° C
(ii) -100° C
(iii) 0° C
(iv) 78° C
Answer:
100° C

Question 12.
Which catalyst is used to prepare oxygen from KClO₃ ?
(i) MnO
(ii) MnO₂
(iii) Mn₃ O₄
(iv) V₂ O₅
Answer:
MnO₂

Question 13.
The method to separate sugar from its equeous solution a –
(i) evaporation
(ii) distillation
(iii) sedimentation
(iv) centrifugation
Answer:
Evaporation

Question 14.
lodine and ethanol can be separated by –
(i) filtration
(ii) evaporation
(iii) distillation
(iv) fractional distillation
Answer:
distillation

Question 15.
Mixture of carbon tetra-chloride and water are separated by using –
(i) funnel
(ii) separating funnel
(iii) breaker
(iv) fractionating column.
Answer:
separating funnel

Question 16.
Boiling point of a liquid –
(i) decreases with increase of pressure
(ii) boiling point has no effect on pressure
(iii) increases with increase of pressure
(iv) do not always increase with increase of pressure.
Answer:
Increases with increase of pressure.

Question 17.
The components of crude oil can be separated by –
(i) fractional distillation
(ii) distillation
(iii) fractional crystallisation
(iv) none of these
Answer:
fractional distillation.

Fill in the blanks :

1. Quick lime when treated with water converts to _______ lime.
Answer:
slaked

2. Graphite is _______ to touch.
Answer:
slippery

3. NH₄ Cl treated with NaOH liberates _______ gas.
Answer:
ammonia

4. Rusting of iron is a _______ change.
Answer:
chemical

5. Both physical and chemical changes occur in burning of _______.
Answer:
candle

6. _______ is a liquid non-metal.
Answer:
Bromine

7. Odour of _______ is pungent.
Answer:
ammonia

8. _______ is a metalloid.
Answer:
Arsenic/Antimony

9. Snow at the base of a glacier melts due to its heavy _______.
Answer:
weight

10. _______ is a soft metal.
Answer:
Sodium

11. Colour of copper suiphate crystal is _______.
Answer:
blue

12. Aqueous solution of oxides of some solid _______ are acidic.
Answer:
non-metals

13. Being non-metal _______ conducts electricity.
Answer:
graphite

14. Water is added to conc. H₂SO₄. This is a _______ change.
Answer:
physical

15. _______ are typically brittle.
Answer:
Non-metals

16. _______ shows the characteristics of both metais and non-metals.
Answer:
Metalloids

17. _______ is insoluble in water but soluble in carbon disulphide.
Answer:
Sulphur.

18. Heating of platinum wire is an example of _______ change.
Answer:
physical

19. Chemical change is _______.
Answer:
permanent

20. Copper sulphate and sulphur are identified by _______.
Answer:
solubility

21. Silver nitrate solution is added to sodium chloride solution to give a curdy white precipitate; the precipitate can be separated from the mixture by a process called _______.
Answer:
filtration.

22. Glycerol is distilled under reduced pressure to avoid _______.
Answer:
evaporation

23. The suspension of chalk in water can be separated by _______.
Answer:
decomposition.

24. Kerosene is lighter and immiscible in water, they can be separated by using _______.
Answer:
separating funnel.