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Zn+H(2)SO(4)rarrZnSO(4)+H(2) Zn underg...

`Zn+H_(2)SO_(4)rarrZnSO_(4)+H_(2)`
Zn undergoes -

A

Reduction

B

Oxidation

C

Both oxidation and reduction

D

None of these

Text Solution

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The correct Answer is:
B
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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) 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) 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) 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) ?

In the reaction , Zn+H_(2)SO_(4) to ZnSO_(4) +H_(2) , zinc acts as

The chief are of Zn is the sulphide , ZnS. The are is concentrated by froth floation process and then heated in air to convert Zns to Zno. 2ZnS+30_(2)overset(80%)to 2ZnO+ 2SO_(2) ZnO+H_(2)SO_(4)overset(100%)to ZnSO_(4)+ H_(2) 2ZnSO_(4)+2H_(2)Ooverset(80%)to 2Zn+ 2H_(2)SO_(4)+O_(2) The number of moles of ZnS required for producing 2 moles of Zn will be:

ALLEN-REDOX REACTIONS-EXERICSE - 3
  1. Oxidation involves

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  2. If in chemical reaction, Fe^(+2) is converted into Fe^(+3), then Fe^(+...

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  3. Zn+H(2)SO(4)rarrZnSO(4)+H(2) Zn undergoes -

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  4. The oxidation state of Cr in Cr(2)O(7)^(2-) is

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  5. The number of moles of KMnO(4) reduced by 1 "mol of" KI in alkaline me...

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  6. The correct order of acidic strength is -

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  7. Number of moles of MnO(4)^(-) required to oxidise one mole of ferrous ...

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  8. Oxidation number of P in PO(4)^(3-), of S in SO(4)^(2-) and that of Cr...

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  9. What will be the oxidation number of Fe in K(3)[Fe(CN)(6)] :-

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  10. In the reaction 2FeCl(3)+H(2)Srarr2FeCl(2)+2HCl+S

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  11. For the redox reation MnO(4)^(-)+C(2)O(4)^(2-)+H^(+)rarrMn^(2+)CO(2)...

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  12. Which of the following act both as oxidant & reductant :-

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  13. Which of the following reaction is spontaneous oxidation - reduction r...

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  14. For reaction : Cr(2)O(7)^(-2)+14H^(+)rarr2Cr^(+3)+7H(2)O, How many e...

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  15. Oxidising agents have high :-

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  16. The ratio of coefficient of HNO(3), Fe(NO(3))(2) and NH(4)NO(3) in the...

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  17. Oxidation number of chlorine in perchloric acid is :-

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  18. Correct order of oxidising strength is :-

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  19. When S(2)O(8)^(2-) oxidise Fe^(2+) then product formed is :-

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  20. The oxidation state of sulhur in H(2)SO(5) and chromium in K(2)Cr(2)O(...

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