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Standard VIII

Chemistry

Uses of metals and nonmetals

CuO is reacte...

Question

CuO is reacted with carbon in the absence of air to form copper. Which process is this?

Roasting

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Calcination

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Reduction

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Both B and C

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Solution

The correct option is D
Both B and C

Copper oxide can be reduced to copper metal using carbon
$2 C u O + C \to 2 C u + C O_{2}$
This process is commonly known as calcination and since it involves the loss of oxygen by CuO, hence this reaction also involves the reduction of CuO.

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Similar questions

Q. Assertion :Roasting is a process in which the ore is heated strongly in absence of air. Reason: Concentration of sulphide ore is done by calcination.

Q. When copper pyrites is roasted in excess of air, a mixture of

C u O + F e O

is formed is present as impurities. This can be removed as slag during reduction of

C u O

. The flux added to form slag is

When copper pyrites is roasted in excess of air, a mixture of CuO + FeO is formed. FeO is present as impurity. This can be removed as slag during reduction of CuO. The flux added to form slag is

A

and

B

are two ores of copper.

A

undergoes calcination to form a solid,

C O_{2 (g)}

and

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

and

B

respectively are:

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CuO is reacted with carbon in the absence of air to form copper. Which process is this?

The correct option is D Both B and C Copper oxide can be reduced to copper metal using carbon 2CuO+C→2Cu+CO2 This process is commonly known as calcination and since it involves the loss of oxygen by CuO, hence this reaction also involves the reduction of CuO.

The correct option is D
Both B and C

Copper oxide can be reduced to copper metal using carbon
$2 C u O + C \to 2 C u + C O_{2}$
This process is commonly known as calcination and since it involves the loss of oxygen by CuO, hence this reaction also involves the reduction of CuO.