The metals like sodium, potassium, and aluminium can be obtained from their ores by:
(I) Heating in presence of air
(II) Heating in absence of air
(III) Electrolysis

I, II, and III

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I and II

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Only I

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Only III

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Solution

The correct option is D Only III
 Correct answer is option (c).

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The two metals which can be extracted just by heating their sulphides in the air are:
(a) sodium and copper (b) copper and aluminium
(c) potassium and zinc (d) mercury and copper

Q. What are the products obtained by heating ethane in:
(a) excess of air
(b) absence of air
(c) air in presence of copper and 120 atm pressure.
(d) air with molybdenum oxide at 100 atm pressure.

Q. The metals like sodium, potassium, and aluminium can be obtained from their ores by:

Q. The two metals which can be extracted just by heating their sulphides in air are:
(a) sodium and copper
(b) copper and aluminium
(c) potassium and zinc
(d) mercury and copper

Q. Consider the following isolation/purification processes.

(I) Heating impure metal with

I_{2}

150 - 200^{\circ} C

and passing the resulting volatile iodide on hot tungsten filament at

1400^{\circ} C

to get the pure metal.
(II) Heating the sulphide ore in the air until a part is converted to oxide and then further heating in the absence of air to let the oxide react with unchanged metal sulphide to get the metal.
(III) Electrolysis of the molten electrolyte containing metal oxide and cryolite or fluorspar to obtain the metal.

The processes used for obtaining aluminium, titanium and lead are respectively :

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The metals like sodium, potassium, and aluminium can be obtained from their ores by:​ (I) Heating in presence of air​ (II) Heating in absence of air​ (III) Electrolysis​

The correct option is D Only III​ Correct answer is option (c).

The metals like sodium, potassium, and aluminium can be obtained from their ores by:
(I) Heating in presence of air
(II) Heating in absence of air
(III) Electrolysis

The correct option is D Only III
 Correct answer is option (c).