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The reaction 2ZnS +3O(2) rarr2ZnO +2SO(2...

The reaction `2ZnS +3O_(2) rarr2ZnO +2SO_(2)` in the metallurgical process of zinc is called

A

Calcination

B

Cupellation

C

Smelting

D

Roasting

Text Solution

Verified by Experts

The correct Answer is:
D
Roasting (Sulphide ore is heated in excess of air).
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Chief ore of Zn is ZnS . The ore is concentrated by froth flotation process and then heated in air to convert ZnS to ZnO . ltntgt 2 ZnS + 3O_(2) rarr 2 ZnO + 2 SO_(2) …(i) ZnO , thus formed is treated with dilute H_(2) SO_(4) . ZnO + H_(2) SO_(4) rarr ZnSO_(4) + H_(2) O ....(ii) On electrolysis of ZnSO_(4(aq)), Zn metal is produced. 2 ZnSO_(4) + H_(2) O rarr 2 Zn + 2H_(2) SO_(4) + O_(2) ....(iii) How many kilomoles of NaOH are required to dissolve all the ZnO produced in reaction (ii) ?

Chief ore of Zn is ZnS . The ore is concentrated by froth flotation process and then heated in air to convert ZnS to ZnO . ltntgt 2 ZnS + 3O_(2) rarr 2 ZnO + 2 SO_(2) …(i) ZnO , thus formed is treated with dilute H_(2) SO_(4) . ZnO + H_(2) SO_(4) rarr ZnSO_(4) + H_(2) O ....(ii) On electrolysis of ZnSO_(4(aq)), Zn metal is produced. 2 ZnSO_(4) + H_(2) O rarr 2 Zn + 2H_(2) SO_(4) + O_(2) ....(iii) ZnO on dissolution in NaOH gives

Chief ore of Zn is ZnS . The ore is concentrated by froth flotation process and then heated in air to convert ZnS to ZnO . ltntgt 2 ZnS + 3O_(2) rarr 2 ZnO + 2 SO_(2) …(i) ZnO , thus formed is treated with dilute H_(2) SO_(4) . ZnO + H_(2) SO_(4) rarr ZnSO_(4) + H_(2) O ....(ii) On electrolysis of ZnSO_(4(aq)), Zn metal is produced. 2 ZnSO_(4) + H_(2) O rarr 2 Zn + 2H_(2) SO_(4) + O_(2) ....(iii) What mass of Zn will be obtained from an ore containing 225 kg of ZnS ? (Zn = 65, S = 32, O = 16, H = 1) .

Chief ore of Zn is ZnS . The ore is concentrated by froth flotation process and then heated in air to convert ZnS to ZnO . ltntgt 2 ZnS + 3O_(2) rarr 2 ZnO + 2 SO_(2) …(i) ZnO , thus formed is treated with dilute H_(2) SO_(4) . ZnO + H_(2) SO_(4) rarr ZnSO_(4) + H_(2) O ....(ii) On electrolysis of ZnSO_(4(aq)), Zn metal is produced. 2 ZnSO_(4) + H_(2) O rarr 2 Zn + 2H_(2) SO_(4) + O_(2) ....(iii) What volume of 98 % H_(2) SO_(4) (by weight, density = 1.8 g//mL ) is required in step (ii) ?

Find the formula of A ZnS + O_(2) rarr (A) + SO_(2) .

ERRORLESS-GENERAL PRINCIPLES & PROCESSES OF ISOLATION OF ELEMENTS-NCERT BASED QUESTIONS (ROASTING & CALCINATION)
  1. Roasting is done generally in case of

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  2. Heating of pyrites in air for oxidation of sulphur is called Heating...

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  3. The reaction 2ZnS +3O(2) rarr2ZnO +2SO(2) in the metallurgical process...

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  4. Roasting is done in

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  5. Roasting of copper pyrites is done:

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  6. A metal obtained directly by roasting of its sulphide ore is

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  7. Calcination is used in matallurgy for removal of

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  8. Which of the following processes involves smelting ?

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  9. A Substance which reacts with gangue to form fusible material is calle...

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  10. Refractory metals are used in construction of furnances because

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  11. The underlying of blast furnace is made of

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  12. Which of the following substance can be used for drying neutral or bas...

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  13. In the modern blast furnaces, the charge consists of a mixture of

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  14. In a lime kiln, to get higher yield of CO(2) the measure that can be t...

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  15. During the extraction of gold the following reactions takes place Au...

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  16. The reduction of zinc oxide with coke occurs at temperature

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  17. Choose the correct option of temperature at which carbon reduced FeO t...

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  18. Find the area of figure given below.

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  19. For the reduction of FeO at the temperature corresponding to point D, ...

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  20. Direction (Q. Nos. 17-20) Answer the questions on the basis of figure ...

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