What does an empirical formula represent?

The simplest whole-number ratio of atoms

Class 9 Chemistry · Chapter 4 · Test 2

Empirical and Molecular Formulas

25 MCQs covering empirical formulas, molecular formulas, simplest whole-number ratios, empirical formula mass, molar mass, and calculations to determine molecular formulas.

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 does an empirical formula represent?
- AThe simplest whole-number ratio of atoms
- BThe actual shape of a molecule
- CThe total number of molecules
- DThe mass of one molecule
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Answer: A
An empirical formula shows the simplest whole-number ratio of atoms in a compound.
Question 2
What is the empirical formula of hydrogen peroxide H2O2?
- AHO
- BH2O
- CHO2
- DH2O2
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Answer: A
Dividing both subscripts in H2O2 by two gives HO.
Question 3
What is the empirical formula of benzene C6H6?
- ACH
- BC2H2
- CC6H6
- DCH2
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Answer: A
Dividing both subscripts by six gives the simplest ratio CH.
Question 4
What is the empirical formula of ethene C2H4?
- ACH2
- BCH
- CC2H4
- DCH4
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Answer: A
Dividing both subscripts by two gives CH2.
Question 5
What is the empirical formula of glucose C6H12O6?
- ACH2O
- BC6H12O6
- CCHO
- DCH3O
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Answer: A
Dividing all subscripts by six gives CH2O.

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