Class 9 Chemistry · Chapter 4 · Test 1

Chemical Formulas

25 MCQs covering chemical symbols, formulas of elements and compounds, atomic and molecular forms, ionic formula units, and the difference between molecular and empirical formulas.

MCQs

25 questions · 22 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
Which symbol represents sodium?
- ANa
- BSo
- CSd
- DN
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Answer: A
Sodium is represented by the chemical symbol Na.
Question 2
Which of the following is the symbol of iron?
- AFe
- BIr
- CIn
- DIo
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Answer: A
The chemical symbol for iron is Fe.
Question 3
Which formula represents a molecule of oxygen gas?
- AO2
- BO
- CO3
- D2O
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Answer: A
Oxygen gas normally exists as diatomic molecules with the formula O2.
Question 4
What is the molecular formula of ozone?
- AO3
- BO2
- CO4
- DO
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Answer: A
Ozone contains three oxygen atoms in each molecule.
Question 5
Which element commonly exists as diatomic molecules?
- AHydrogen
- BHelium
- CSodium
- DCarbon
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Answer: A
Hydrogen commonly exists as H2 molecules.

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