Class 9 Chemistry · Chapter 4 · Test 5

Avogadro's Number and Mole

25 MCQs covering the definition of a mole, Avogadro’s number, the relationship between moles and particles, conversion between moles and molecules, and calculations involving atoms and molecules.

MCQs

25 questions · 20 min · 25 marks

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Sample questions

The first 5 of 25. Try each one, then tap to see the answer.

Question 1
What is the SI unit for the amount of substance?
- AGram
- BLitre
- CMole
- DKilogram
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Answer: C
The mole is the SI unit for the amount of substance.
Question 2
What is the value of Avogadros number?
- A6.022 x 10^20
- B6.022 x 10^21
- C6.022 x 10^22
- D6.022 x 10^23
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Answer: D
One mole contains approximately 6.022 x 10^23 elementary entities.
Question 3
What does one mole of a substance contain?
- AOne gram of particles
- BOne litre of particles
- C6.022 x 10^23 particles
- D100 particles
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Answer: C
One mole contains Avogadros number of specified particles.
Question 4
Which quantity is represented by the unit mol?
- AMass
- BAmount of substance
- CVolume
- DDensity
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Answer: B
The mole is the unit used to measure amount of substance.
Question 5
How many molecules are present in one mole of oxygen gas?
- A6.022 x 10^23
- B3.011 x 10^23
- C6.022 x 10^22
- D1.2044 x 10^24
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Answer: A
One mole of any molecular substance contains 6.022 x 10^23 molecules.

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