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Write the principle of method used for r...

Write the principle of method used for refining of germanium.

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(a) Write the principle of method used for the refining of germanium (b) Out of PbS and PbCO_(3) (ores of lead), which one is concentrated by froth floatation process preferably ? (c) What is the significance of leaching in the extraction of aluminium ?

Outline the principle of the method used for refining of (a) Nickel (b) Zirconium (c ) Tin

Zone refining method is used for refining

CBSE COMPLEMENTARY MATERIAL-PRACTICE PAPER 3-Very Short Answer Type Questions
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  2. Complete the following reactions : NH(3)+Cl(2)("excess")rarr

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  3. Complete the reaction MnO2 + HCl overset(Delta)to

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  5. Among the following which one acts as a food preservative ? Aspart...

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  6. Write the principle of method used for refining of germanium.

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  7. Out of PbS and PbCO3, which one is concentrated by froth floatation pr...

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  8. Account for the following: The lowest oxide of transition metal is b...

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  9. Orange colour of Cr(2)O(7)^(2-) ion changes to yellow when treated wi...

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  10. Chemistry of actionoids is complicated as compared to lathanoids. Give...

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  11. How is the variability in oxidation state of transition metals differ...

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  12. Write the mechanism of following reaction : 2CH(3)CH(2)-OH underset...

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  13. How do you convert the following Propan-2-ol to 2-methyl propan-2-o...

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  14. Write short notes on biodegradable polymer? Give one example.

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  15. Write one structural difference between low density polythene and high...

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  16. Write IUPAC names of the monomers of Terylene.

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  17. When MnO2 is fused with KOH in the presence of KNO3 as an oxidising a...

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  18. Complete the reaction. MnO(4)+S(2)O(3)^(2-) +H(2)O to

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  19. When chromite ore FeCr(2)O(4) is fuse with NaOH in presence of air, a ...

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  20. Complete the reaction. Cr(2)O(7)^(2-)+Sn^(2+)+4^(+) to

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