Class 12 Chemistry Metallurgy General Principles and Processes of Isolation of Elements
Which of the following statements is/are true?
(a)
In process of the precipitation of silver from sodium dicyano argentate (I), the zinc acts as reducing agent as well as complexing agent.
(b)
In the process of roasting, the copper pyrites is converted into a mixture of & FeS which, in turn, are partially oxidised.
(c)
Limonite, haematite and magnesite are ores of iron.
(d)
Tin and lead both are extracted from their ores by carbon reduction.
Correct answer: (b)  (d) 
Solution:  this is a oxidation process, which then form complex with
. Zinc acts both as complexing and reducing reagent.
In the process of roasting, the copper pyrites is converted into a mixture of & FeS which, in turn, are partially oxidised.
As roasting is generally used to convert sulphide ore into oxide.
Magnesite is ore of magnesium.
Carbon reduction:
,

.

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general principles and processes of isolation of elements
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general principles and processes of isolation of elements
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