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Chemistry [2 Mark Question Answer]

11.2 Alkanes · ICSE STD 10 (ICSE - English Medium). 5 questions.

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[2 Mark Question Answer]

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Question 12 Marks
how can we prepare ethane by reduction of a halogen compound?
Answer
By reduction of Ethyl iodide using $Zn + Cu$ couple in alcohol, ethane is formed.
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CH _3 CH _2 I +2[ H ] \longrightarrow C _2 H _6+ HI
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Question 22 Marks
How is ethane prepared by Wurtz reaction?
Answer
When methyl bromide or methyl iodide and sodium are heated in presence of dry ether, ethane is formed.
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Ch _3 I +2 Na + ICH _3 \xrightarrow{\text { Dryether }} CH _3- CH _3+2 NaI
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Question 32 Marks
How is methane gas prepared in laboratory?
Answer
Mixture of sodium ethanoate and soda lime is heated in a hard glass tube.
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CH _3 COONa + NaOH \xrightarrow{ CaO } CH _4+ Na _2 CO _3
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Question 42 Marks
What is greenhouse gas? What is the contribution of methane in causing greenhouse effect?
Answer
Some components of the atmosphere such as water vapour, carbon dioxide, nitrous oxide and methane absorb heat energy reflected by the earths surface and hence increase the average atmospheric temperature. These gases are called greenhouse gases.

Methane contributes to the greenhouse effect to an extent of 19%, and the concentration of methane has been increasing at the rate of 1.5% per year.

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Question 52 Marks
What are the main sources of alkanes and why they are known as saturated hydrocarbons?
Answer
The main sources of alkanes are natural gas and petroleum.
Alkanes are known as saturated hydrocarbons because the carbon atoms in their molecules are bonded to each other by single covalent bond. Each carbon atom is again bonded to hydrogen atom.
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[2 Mark Question Answer] - Chemistry STD 10 Questions - Vidyadip