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The chief ore of Zn is the sulphide , Zn...

The chief ore 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:

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NARENDRA AWASTHI-STOICHIOMETRY-Level 3 - Subjective Problems
  1. The chief ore of Zn is the sulphide , ZnS. The are is concentrated by ...

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  2. What volume of a liquid (in L) will contain 10 mole ? If molar mass of...

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  3. 16 g of SO(x) gas occupies 5.6 L at 1 atm and 273 K.What will be the v...

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  4. 200 mL of 1M HCl, is mixed with 300 mL of 6 M and the final solution i...

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  5. N(2)(g) reacts with H(2)(g) in either of the following ways depending ...

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  6. One commercial system removes SO(2) emission from smoke at 95(@)C by t...

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  7. W is the mass of iron (in g) which will be converted into Fe(3)O(4) by...

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  8. Calculate the total moles of atoms of each element present in 122.5 g ...

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  9. On dissolving 2.0 g of metal in sulphuric acid ,4.51 g of the metal su...

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  10. One gram of a metallic chloride was found to contain 0.835 g of chlori...

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  11. 0.7875 g of crystalline barium hydroxide is dissolved in water .For th...

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  12. 2.0 g of polybasic organic acid (Molecular mass =600) required 100 mL ...

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  13. A mixture contains 1.0 mole each of NaOH,Na(2)CO(3) and NaHCO(3). When...

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  14. When BrO(3)^(-) ion reacts with Br^(-) ion in acidic medium, Br(2) is ...

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  15. A volume of 12.5 mL of 0.05 M SeO(2) reacts with 25 mL of 0.1 M CrSO(4...

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  16. A 0.276 g impure sample of copper ore is dissolved and Cu^(2+) is titr...

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  17. A sample of 28 mL of H(2) O(2) (aq) solution required 10 mL of 0.1 M K...

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  18. For the redox reaction given, what is the value of (x)/(z) ? xNO(3)^...

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  19. On heating 0.220 g of a metallic oxide in presence of hydrogen,0.045 g...

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  20. 10 g mixture of K(2)Cr(2)O(7) and KMnO(4) was treated with excess of K...

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  21. In an ore, the only oxidizable material is Sn^(2+). This ore is titrat...

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