Class 9 Chemistry · Chapter 4 · Test 4
Molecular and Structural Formulas
25 MCQs Molecular Formulas from Structural Formulas
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 a molecular formula show?
- AThe arrangement of atoms
- BThe types and numbers of atoms in a molecule
- CThe shape of a molecule
- DThe bonds only
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Answer: B
A molecular formula gives the kinds and numbers of atoms present in a molecule.
Question 2
Which formula represents one carbon atom and four hydrogen atoms?
- ACH2
- BCH3
- CCH4
- DC2H4
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Answer: C
One carbon atom and four hydrogen atoms are represented by CH4.
Question 3
How many hydrogen atoms are present in H2O?
- A1
- B2
- C3
- D4
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Answer: B
The subscript 2 indicates two hydrogen atoms.
Question 4
How many oxygen atoms are present in CO2?
- A1
- B2
- C3
- D4
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Answer: B
The subscript 2 indicates two oxygen atoms.
Question 5
What is the molecular formula of ammonia?
- ANH2
- BNH3
- CN2H
- DN2H3
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Answer: B
Ammonia contains one nitrogen atom and three hydrogen atoms.
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