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Extraction of Copper

Which one of ...

Question

Which one of the following processes involve chemical reactions?

A

Storing of oxygen gas under pressure in a gas cylinder

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B

Liquification of air

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C

Keeping petrol in a china dish in the open

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D

Heating copper wire in presence of air at high temperature

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Solution

The correct option is D Heating copper wire in presence of air at high temperature
When copper is heated in presence of air very slowly at high temperature, a layer of brown black copper oxide is formed which protect the copper from extensive corrosion.

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Q. Question 16

Which one of the following processes involves chemical reactions?

(a) Storing of oxygen gas under pressure in a gas cylinder.
(b) Liquefaction of air.
(c) Keeping petrol in a china dish in the open.
(d) Heating copper wire in presence of air at high temperature.

Q. Which one of the following processes involve chemical reactions?
(i) Filling of LPG gas under pressure in gas cylinders
(ii) Liquefaction of air
(iii) Rusting of an iron object
(iv) Heating platinum wire in the presence of air at a high temperature

[0.8 mark]

Q. Identify the type of chemical reaction taking place and also write the balance chemical equation for : on heating copper powder in air is china dish, a surface of copper powder turns block.

Q. Arrange the steps involved in obtaining oxygen gas from air.
1. Liquify air by increasing the pressure and decreasing the temperature.
2. Collect the liquid oxygen in a jar.
3.

C O_{2}

separates out as dry ice.
4. Separate nitrogen gas through a fractionating column.

Under which of the following conditions applied together, a gas deviates most from the ideal hevaviour?

(a) Low pressure (b) High pressure

(c) Low temperature (d) High temperature

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