Why is cracking carried out?

To increase the supply of hydrocarbons that are more in demand

To remove all carbon from petroleum

Class 9 Chemistry · Chapter 11 · Test 8

Alkane Preparation and Reactions

25 MCQs covering preparation of alkanes by cracking hydrogenation and reduction of alkyl halides along with halogenation substitution combustion and the chemical properties of alkanes.

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 cracking?
- ABreaking larger hydrocarbons into smaller hydrocarbons
- BJoining small hydrocarbons together
- CConverting alkanes into metals
- DRemoving carbon from hydrocarbons
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Answer: A
Cracking breaks higher molecular mass hydrocarbons into smaller hydrocarbons that are more in demand.
Question 2
Why is cracking carried out?
- ATo increase the supply of hydrocarbons that are more in demand
- BTo decrease fuel production
- CTo produce only water
- DTo remove all carbon from petroleum
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Answer: A
Cracking helps balance the availability of petroleum fractions with demand.
Question 3
At approximately what temperature is naphtha heated during cracking?
- A500°C
- B100°C
- C200°C
- D1000°C
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Answer: A
The source states that naphtha is heated at around 500°C during cracking.
Question 4
Which catalyst is used for cracking naphtha?
- AZeolite
- BNickel
- CZinc
- DIron
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Answer: A
Zeolite is used as the catalyst when naphtha is heated during cracking.
Question 5
What is the approximate carbon range of hydrocarbons obtained from cracking naphtha?
- AFive to ten carbon atoms
- BOne to two carbon atoms
- CTwo to three carbon atoms
- DFifteen to twenty carbon atoms
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Answer: A
The source states that cracking naphtha gives hydrocarbons containing five to ten carbon atoms.

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