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Concentration of Ore

Galena an ore...

Question

Galena (an ore) is parrtially oxidized by passing air through it at high temperature. After some time, the passage of air is stopped, but the heating is continued in a closed furnace such that the contents undergo self-reduction. The weight (in kg) of Pb produced per kg of $O_{2}$ consumed is

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Solution

The given reaction will be
$2 P b S + 3 O_{2} \to 2 P b O + 2 S O_{2} 2 P b O + P b S \to 3 P b + S O_{2} - ------------------------------- - 3 P b S + 3 O_{2} \to 3 P b + 3 S O_{2}$
So, 3 mol of $O_{2}$ gives 3 mol of $P b$
Thus in other words 96 kg of $O_{2}$ gives 621 kg of $P b$ .
So, 1 kg of $O_{2}$ will give $\frac{621}{96} = 6.47 k g$

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Q. Galena (an ore) is parrtially oxidized by passing air through it at high temperature. After some time, the passage of air is stopped, but the heating is continued in a closed furnace such that the contents undergo self-reduction. The weight (in kg) of Pb produced per kg of

O_{2}

Q. Galena (an ore) is partially oxidized by passing air through it at high temperature. After some time, the passage of air is stopped, but the heating is continued in a closed furnace such that the contents undergo self-reduction. The weight (in kg) of

P b

produced per kg of

O_{2}

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[Atomic weight in

g m o l^{- 1} : O = 16, S = 32, P b = 207

]

Q. Main source of lead is galena (

P b S

). It is converted to

P b

A

P b S a i r - \to Δ P b O + S O_{2} C \to P b + C O_{2}

(

B

P b S a i r - \to Δ P b O + P b S \to P b + S O_{2}

Identify the self-reduction process.

Q. Lead obtained from galena ore (PbS) by air reduction or carbon reduction process contains base metal (Cu, Bi, As, Sn, Zn) as impurities. Gelatin acts as an addition agent in the electrolysis of Pb. In the presence of gelatin, Pb becomes :

Q. Choose the correct option for the following statements
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Statement - 3: Roasting involves heating in absence of air until volatile matter escapes.
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A l_{2} O_{3}

N a_{3} A l F_{6}

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which increases the melting point of the mix.

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