Tag: importance of carbon

Questions Related to importance of carbon

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

Which of the following is not a source of carbon?

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

  1. limestone

  2. dolomite

  3. calcite

  4. haemetite

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Correct Option: D
Explanation:

All are sources of inorganic carbon, but haematite is an ore of iron.

Which symbol is used for the element carbon?

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

  1. $C$

  2. $Ca$

  3. $Cn$

  4. $Co$

  5. $Cu$

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Correct Option: A
Explanation:

Elemental carbon is represented by $ C $. 


$Ca$ is calcium, $Cn$ is copernicium, $Co$ is cobalt and $Cu$ is copper. 

Hence the correct option is A.

Compound with maximum number of $\sigma$-bond:

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

  1. $CH _3CH _2CH _3$

  2. $CH _3OH$

  3. $C _6H _6$

  4. $C _6H _5CH _3$

  5. $C _6H _5C _2H _5$

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Correct Option: E

Carbon has zero oxidation number in

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

  1. $CH _{4}$

  2. $\mathrm { CH } _ { 3 } \mathrm { Cl}$

  3. $C C l _ { 4 }$

  4. $\mathrm { CH } _ { 2 } \mathrm { Cl } _ { 2 }$

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Correct Option: D

Graphite melts at a high temperature of about:

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

  1. $4236^oC$

  2. $5326^oC$

  3. $3527^oC$

  4. $6326^oC$

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Correct Option: A
Explanation:

graphite have melting point around $3500^o C $ to $ 4200^o C$