Tag: carbon- an important element

Questions Related to carbon- an important element

When vegetable matter decays at the bottom of lakes and ponds where there is limited air, it gives rise to 'marsh gas', which is:

methane study of methane carbon- an important element hydrocarbons chemistry

  1. oxygen

  2. chlorine

  3. butane

  4. methane

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Correct Option: D
Explanation:
(i) Marsh gas is a mixture of methane, hydrogen sulfide and carbon dioxide which has methane at high percentage compared to the other two compounds.
(ii) Marsh gas is produced naturally in flooded regions.
(iii) This condition allows anaerobic digestion and fermentation of organic matter which produces methane

Statement I: Methane is defined as a compound
Statement II: Methane can be broken down chemically

methane study of methane carbon- an important element hydrocarbons chemistry

  1. Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1

  2. Both the Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1

  3. Statement 1 is correct but Statement 2 is not correct.

  4. Statement 1 is not correct but Statement 2 is correct.

  5. Both the Statement 1 and Statement 2 are not correct.

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Correct Option: A
Explanation:

Statement I: methane is defined as a compound
statement II: Methane can be broken down chemically
Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.
Note: Compounds are defined as substances of definite compositions which can be decomposed into two or more substances by a simple chemical process.

The correct composition of water gas is :

methane study of methane carbon- an important element hydrocarbons chemistry

  1. mixture of $H _2$ and $CO$

  2. mixture of $N _2$ and $CO$

  3. mixture of $He$ and $CO$

  4. mixture of $O _2$ and $CO$

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Correct Option: A
Explanation:

Water gas is produced from synthesis gas, which is composed of carbon monoxide and hydrogen. Syngas is a useful product, but requires careful handling due to its flammability and the risk of carbon monoxide poisoning. 

Reaction of methane with halogens under appropriate conditions is called as :

methane study of methane carbon- an important element hydrocarbons chemistry

  1. Halogenation

  2. Free radical halogenation

  3. Methylation

  4. Chlorination

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Correct Option: B
Explanation:

Methane reacts with halogens given appropriate conditions as follows:

${X} _{2} + UV \rightarrow  2 X \cdot$

$X \cdot + C{H} _{4} \rightarrow HX + C{H} _{3} \cdot$

$C{H} _{3} \cdot + {X} _{2} \rightarrow C{H} _{3}X + X \cdot$

where $X$ is a halogen: fluorine $\left(F\right)$, chlorine $\left(Cl\right)$, bromine $\left(Br\right)$, or iodine $\left(I\right)$. This mechanism for this process is called free radical halogenation.

Which are the gases formed in a biogas plant?

methane study of methane carbon- an important element hydrocarbons chemistry

  1. $CO, CH _{4}$

  2. $CH _{4}, CO _{2}$

  3. $CO _{2}, O _{2}$

  4. $N _{2}, S _{2}$

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Correct Option: A