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Reaction with Oxygen

Copper underg...

Question

Copper undergoes corrosion in the presence of , oxygen, and water vapour to form __.

A

carbon dioxide, copper carbonate

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B

carbon monoxide, copper hydroxide

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C

hydrogen sulphide, copper hydroxide

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D

hydrogenn sulphide, copper carbonate

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Solution

The correct option is A carbon dioxide, copper carbonate
Copper reacts with carbon dioxide gas, oxygen gas, and water vapour present in the atmosphere to form a green layer of basic copper carbonate on its surface.
$2 Cu (s) + H_{2} O (g) + {CO}_{2} (g) + O_{2} (g) \to {CuCO}_{3} (s) + Cu {(OH)}_{2} (s)$

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Q. Copper undergoes corrosion in the presence of ______, oxygen, and water vapour to form ________.

A

B

are two ores of copper.

A

undergoes calcination to form a solid,

C O_{2 (g)}

O_{2 (g)}

B

undergoes roasting to form a solid and a gas

C

which turns acidified

K_{2} C r_{2} O_{7}

to green solution.

B

also reacts with dil

H C l

to form a solid and gas

D

which turns lead acetate solution black.

D

also reacts with

C

to form colloidal sulphur in the presence of moisture.

The copper ores

A

B

respectively are:

A

B

are two ores of copper.

A

undergoes calcination to form a solid,

C O_{2 (g)}

O_{2 (g)}

B

undergoes roasting to form a solid and a gas

C

which turns acidified

K_{2} C r_{2} O_{7}

to green solution.

B

also reacts with dil

H C l

to form a solid and gas

D

which turns lead acetate solution black.

D

also reacts with

C

to form colloidal sulphur in the presence of moisture.

The nature of the gas (

D

) and hybridization of the central atom is respectively:

Aluminium is said to be more reactive than iron, towards oxygen (or air).Yet iron undergoes corrosion to a greater extent than aluminium.Explain.

When air is blown from mouth into a test-tube containing lime water, the lime water turns milky due to the presence of :
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(b) carbon dioxide
(c) nitrogen
(d) water vapour

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