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Chemical Properties of Alkanes

Combustion of...

Question

Combustion of alkanes in limited supply of oxygen leads to the formation of and water.

A

carbon dioxide (

{CO}_{2}

)

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B

carbon monoxide (CO)

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C

formaldehyde (HCHO)

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D

methanol (

{CH}_{3} OH

)

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Solution

The correct option is B carbon monoxide (CO)
Limited supply of oxygen leads to incomplete combustion of alkanes. It results in the formation of carbon monoxide and water. e.g. $2 {CH}_{4} + 3 O_{2} \to 2 CO + 4 H_{2} O$

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Fill in the blanks :

(a) ___ product when carbon is burnt in a limited supply of air or oxygen.

(b) Carbon monoxide burns in air with a ___ flame to form carbon dioxide.

(c) Carbon monoxide is a product of ___ combustion

(d) A mixture of 95 $%$ oxygen and 5 $%$ carbon dioxide is called ___

(e) Carbon monoxide is used as a ___ in the extraction of pure metals from their corresponding ores.

Q. Incomplete combustion of carbon is due to insufficient amount of air (oxygen) and leads to the formation of carbon monoxide (CO).

Q. Write balanced equations for the following reactions.
(a) Combustion of

C_{2} H_{10}

in a limited supply of oxygen to form carbon monoxide and water.
(b)The reaction of calcium carbide with water to form acetylene.
(c)The precipitation of calcium cyanamide from calcium carbide and nitrogen.
(d)Formation of hydrogen cyanide from methane and ammonia.

Q. State whether the following statement is True or False:
Incomplete combustion of carbon is due to insufficient amount of air (oxygen) which leads to the formation of carbon monoxide (CO).

Q. Assertion :It is dangerous to burn methane in an insufficient supply of air. Reason: Methane creates carbon dioxide and suffocates you, or worse, partial combustion produces carbon monoxide which, if you inhale it, ties up your haeamoglobin and prevents it carrying oxygen around your body

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