Advertisements
Advertisements
प्रश्न
Assertion (A): The extraction of metals from their sulphide ores cannot take place without roasting the ore.
Reason (R): Roasting converts sulphide ores directly into metals.
पर्याय
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
Assertion (A) is true, but Reason (R) is false.
Assertion (A) is false, but Reason (R) is true.
उत्तर
Assertion (A) is true, but Reason (R) is false.
Explanation:
Roasting converts sulphide ores directly into metals is incorrect as roasting does not convert sulphide ores directly into metals. Instead, it converts sulphide ores into their oxides, which can then be reduced to metals in subsequent steps. This is crucial as metal oxides are generally easier to reduce to metals compared to their sulphides.
APPEARS IN
संबंधित प्रश्न
Name two metals which are highly resistant to corrosion.
Explain why, carbon cannot reduce oxides of sodium or magnesium.
Which of the following metals can be obtained from haematite ore?
(a) copper
(b) sodium
(c) zinc
(d) iron
The metal which can be extracted simply by heating the cinnabar ore in air is:
(a) Zn
(b) Cu
(c) Al
(d) Hg
State three objectives achieved during the roasting of ores.
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
What is the function of cryolite used along with alumina as the electrolyte?
How are metals refined by the electrolytic methods?
Name the process used for the enrichment of sulphide ore.
In the electrolytic reduction of alumina, the lining of graphite acts as an anode.
Explain the following reaction with the balanced equation.
Chlorine dissolved in water
