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Hydrocarbons
10 Class 10 Chemistry questions with answers and explanations.
Printable worksheet with answer key
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The general formula of alkanes is:
- 1 CnH2n-2
- 2 CnH2n
- 3 CnH2n+2
- 4 CnHn
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Correct answer: CnH2n+2
Alkanes are saturated with the formula CnH2n+2.
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The simplest alkene is:
- 1 Propane
- 2 Ethene
- 3 Methane
- 4 Ethyne
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Which hydrocarbon has a triple bond?
- 1 Ethene
- 2 Ethyne
- 3 Methane
- 4 Ethane
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Correct answer: Ethyne
Alkynes such as ethyne have a carbon to carbon triple bond.
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Alkenes decolourise bromine water because they are:
- 1 Acidic
- 2 Unsaturated
- 3 Saturated
- 4 Ionic
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Correct answer: Unsaturated
The double bond adds bromine, so the colour disappears.
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Complete combustion of methane gives:
- 1 Carbon and water
- 2 Carbon dioxide and water
- 3 Methanol
- 4 Carbon monoxide and hydrogen
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The number of carbon atoms in propane is:
- 1 3
- 2 4
- 3 2
- 4 5
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The number of hydrogen atoms in ethene, C2H4, is:
- 1 6
- 2 2
- 3 8
- 4 4
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Polythene is made from many molecules of:
- 1 Ethane
- 2 Methane
- 3 Ethene
- 4 Ethyne
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The general formula of alkenes is:
- 1 CnH2n+2
- 2 CnH2n
- 3 CnHn
- 4 CnH2n-2
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Natural gas is mainly:
- 1 Benzene
- 2 Butane
- 3 Methane
- 4 Ethene