The flow chart below illustrates the extraction of Zinc. Study it and answer the questions that follow:

The flow chart below illustrates the extraction of Zinc. Study it and answer the questions that follow:

a) Name:-
i) Gas Q
ii) Liquid R
(iii) Residues S
b) Name the sulphide ore used
c) Before the ore is roasted, it is first concentrated;
(i) Explain why it is necessary to concentrate the ore
(ii) Explain briefly the process of concentrating the ore
d) Write an equation for the reaction that takes place in the:-
(i) Roaster
(ii) Reaction chamber
(e) (i) Name one major impurity present in the sulphide ore used
(ii) Write an equation to show how the impurity in (e)(i) above is removed
f) Given that the sulphide ore contains only 45% Zinc sulphide by mass, calculate :
(i) The mass in grams of Zinc sulphide that would be obtained from 250kg of the ore.
(ii) The volume of Sulphur (IV) oxide that would be obtained from the mass of sulphide
ore at room temperature and pressure
(Zn = 65.4, S = 32.0, O= 16.0, I mole of gas occupies 24.0 liters at r.t.p)

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(a) (i) Gas Q- Carbon (II) Oxide

(ii) Liquid R- dilute sulphuric acid

(iii) Residue S – excess Zinc metal

(b) Zinc blende

(c) (i) To increase percentage of Zinc in the ore
(ii) The ore is crushed, mixed with water and oil and then air is blown into the mixture.

(d) (i) 2ZnS_(s) + 3O_2(g)------->ZnO_(s) + 2SO_2(g)

(ii) Zn_(s) + H₂SO_4(aq)--------->ZnSO_4(aq) + H_2(g)

(e) (i) - Lead (II) sulphate //Pbs
- Silica //silicon (IV) oxide// SiO2
(ii) Lead (II) sulphide
2PbS_(s) + 3O_2(g)------->2PbO_(s) + 2SO_2(g)

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maurice.mutuku answered the question on November 1, 2019 at 07:40

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