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Which of the following statements is/are true?

Question

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

C u_{2} S

& 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.

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Text solutionVerified

A g \to [A g^{+}]

this is a oxidation process, which then form complex with

C N^{-}

.

2 [A g (CN)_{2}] + Z n \to 2 A g ↓ + [Z n (CN)_{4}]^{2 -}

. Zinc acts both as complexing and reducing reagent.
In the process of roasting, the copper pyrites is converted into a mixture of

C u_{2} S

& FeS which, in turn, are partially oxidised.
As roasting is generally used to convert sulphide ore into oxide.
Magnesite

(M g C O_{3})

is ore of magnesium.
Carbon reduction:

S n O_{2} + 2 C \to S n + 2 CO

,

2 P b S + 3 O_{2} \to 2 P b O + S O_{3}

P b O + C \to P b + CO

.

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Question Text	Which of the following statements is/are true?
Answer Type	Text solution:1
Upvotes	150