Chemistry Gases Test 2 Online Mcqs

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Question 1

1. A bottle of copper (II) oxide has been contaminated wit5h some solid, NaCI. How can NaCI be removed from the (II) oxide?

Answer

Add dilute acid to the mixture and filter

Answer

Heat the mixture and allow it to cool

Answer

Add water to the mixture and filter

Answer

Place the mixture in a separating funnel

Question 2

2. Solvent extraction method is particularly useful technique for separation when the product to be separated is:

Answer

Volatile or thermally stable

Answer

Non- volatile or thermally stable

Answer

Non –volatile or thermally unstable

Answer

Volatile or thermally unstable

Question 3

3. What method is used to remove insoluble solids from muddy water?

Answer

Evaporation

Answer

Chlorination

Answer

Filtration

Answer

Distillation

Question 4

4. Fluted filter paper is used for

Answer

To avoid premature crystallization of the solute

Answer

Filtering the hot saturated solution

Answer

To dissolve large amount of substance at its boiling point

Answer

Increasing the rate of filtration

Question 5

5. A flask contains the liquids trichloromethane (chloroform) and H₂O They are separated using a separating funnel. Which conclusion can be made form this observation alone?

Answer

Trichloromethane and water do not mix

Answer

Trichloromethane and water have different relative masses

Answer

Trichloromethane has a higher density than water

Answer

Trichloromethane and water having different boiling points

Question 6

6. Sublimation is a process for the separation of:

Answer

Solute and solvent from a solution

Answer

Ionic and covalent compound

Answer

Solution of volatile and non-volatile liquids

Answer

Volatile and non-volatile solids

Question 7

7. The process of filtration is used to:

Answer

Separate insoluble particles from liquids

Answer

Separate solute from solution

Answer

Separate the two immiscible liquids

Answer

Separate the two miscible liquids

Question 8

8. Gooch crucible is used in a suction filtering apparatus, because:

Answer

It keeps the stem of funnel full of liquid

Answer

It is used for filtration of precipitates which need to be in ignited

Answer

It is used to separate organic compound from water

Answer

A solid compound is purified

Question 9

9. The solvent is selected for crystallization of a substance on the basis of:

Answer

It should react chemically

Answer

Its polar nature

Answer

On hit and trial basis

Answer

It non-polar nature

Question 10

10. A filtration process could be very time consuming if it was not added by a gentle suction which is developed

Answer

If the paper fits tightly

Answer

If the paper has got small size pores in it

Answer

If the paper covers the funnel up to its circumference

Answer

If the stem of the funnel is large so that it dips into the filtrate

Question 11

11. Slow cooling of hot saturated solution yields.

Answer

Premature crystallization of the solute

Answer

Large size crystals

Answer

Medium size crystal

Answer

Immiscible liquids

Question 12

12. For smooth filtration one of the following precautions should be observed

Answer

The filter paper should be small

Answer

The stem of the funnel should be small

Answer

The stem of the funnel should remain continuously full of liquids

Answer

The tip of funnel should not touch the beaker

Question 13

13. From which mixture can the fast substance be obtained by adding water stirring and filtering?

Answer

Oxygen and nitrogen

Answer

Sodium chloride and copper

Answer

Magnesium and iron

Question 14

14. The top of funnel stem should touch the side of the beaker because

Answer

Filtrate runs down without crystals

Answer

This gives bigger size crystals

Answer

This gives medium size crystals

Answer

The filtrate is quick

Question 15

15. Preparation of aspirin is carried out by the reaction of salicylic acid with

Answer

Acetic acid and water

Answer

Acetic acid and ethyl alcohol

Answer

Acetic acid and acetic anhydride

Answer

Acetic acid and sulphuric acid

Question 16

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Total Questions:	15
Time Allowed:	15 Minutes
Total Marks:	15
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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