Tag: occurrence of carbon compounds in nature

Questions Related to occurrence of carbon compounds in nature

Process of conversion of wood into coal by biochemical process, taking over millions of years is called:

allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

  1. catenation

  2. carbonation

  3. pyrolysis

  4. destructive distillation

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Correct Option: B
Explanation:

The Process of conversion of wood into coal by biochemical process is known as Carbonization. Coal burns cleaner than wood burning coal was easier because coal burned longer than wood.

Carbonization is the term for the conversion of an organic substance into carbon or a carbon-containing residue through pyrolysis or destructive distillation. It is often used in organic chemistry with reference to the generation of coal gas and coal tar from raw coal.

When super heated steam is passed through white hot wood charcoal, it gets reduced to a mixture of $X, Y$ and this reaction is named as $Z$. Identify $Y$.

allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

  1. $C{O} _{2}$

  2. $S{O} _{2}$

  3. ${H} _{2}$

  4. $N{O} _{2}$

Show answer
Correct Option: C
Explanation:
$X + Y \longrightarrow CO + H _2(water-gas)$
$X = CO$
$Y = H _2$
$XY = water- gas (CO + H _2)$ reaction is exothermic.

$Z$ is known as $carbonisation$ reaction.
Hence, the correct option is C.

When super heated steam is passed through red hot wood charcoal, it gets reduced to a mixture of $X$ and $Y$ and this mixture is named as $Z$. Identify the mixture $Z$.

allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

  1. Producer gas

  2. Water gas

  3. Coal gas

  4. Soda water

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Correct Option: B
Explanation:

When super heated steam is passed through hot wood charcoal then reaction takes place as


$C + H _2O \rightarrow CO + H _2$

The combination of $CO$ and $H _2$ is known as water gas.

${ C } _{ 12 }{ H } _{ 22 }{ O } _{ 11 }\xrightarrow { \quad \quad Conc.{ H } _{ 2 }S{ O } _{ 4 }\quad \quad  } 12C+11{ H } _{ 2 }O$
Which of the following is obtained by the above reaction?

allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

  1. Animal charcoal

  2. Sugar charcoal

  3. Coke

  4. Wood charcoal

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Correct Option: B
Explanation:

Sugar when treated with con. $H _2SO _4$ it gives carbon as sugar charcoal and water.

${ C } _{ 12 }{ H } _{ 22 }{ O } _{ 11 }\xrightarrow { \quad \quad Conc.{ H } _{ 2 }S{ O } _{ 4 }\quad \quad  } 12C+11{ H } _{ 2 }O$

In the preparation of wood charcoal, liquid pyroligneous acid is obtained. It consists of:

allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

  1. acetone

  2. methanol

  3. acetic acid

  4. Vinegar

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Correct Option: A,B,C
Explanation:

In the preparation of wood charcoal, liquid pyroligneous acid is obtained. It consists of acetone, methanol and acetic acid.

The tetrahedral structure of carbon was proposed by__________.

chemistry occurrence of carbon compounds in nature importance of carbon covalent bonding in carbon compounds carbon and its forms

  1. Kekule

  2. Wohler

  3. Vant Hoff and Le-Bel

  4. Berthlot

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Correct Option: C
Explanation:

The discovery of stereoisomerism is due to Vant Hoff and Le Bel, who proposed tetrahedral geometry to a carbon atom

All allotropes of carbon exist in ___________ state at room temperature.

chemistry occurrence of carbon compounds in nature importance of carbon covalent bonding in carbon compounds carbon and its forms

  1. liquid

  2. solid

  3. gas

  4. plasma

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Correct Option: B
Explanation:

All allotrope of carbon exist in solid state at room temperature.


Hence the correct option is (B).

How many triple covalent bonds can a single carbon atom form at a time?

chemistry occurrence of carbon compounds in nature importance of carbon covalent bonding in carbon compounds carbon and its forms

  1. 3

  2. 2

  3. 1.5

  4. 1

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Correct Option: D
Explanation:

The carbon atom has a maximum valency of 4 and it can form one triple bond.


So, the correct option is $D$

How many double covalent bonds can a single carbon atom form at a time?

chemistry occurrence of carbon compounds in nature importance of carbon covalent bonding in carbon compounds carbon and its forms

  1. 1

  2. 2

  3. 3

  4. 4

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Correct Option: B
Explanation:

carbon can have a maximum valency of 4 and can form at the most two double bonds.

The oxidation state of carbon in carbon monoxide is: 

chemistry occurrence of carbon compounds in nature importance of carbon covalent bonding in carbon compounds carbon and its forms

  1. $+2$

  2. $+4$

  3. $+3$

  4. $-4$

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Correct Option: A