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Give reasons: Why is HCl not used to aci...

Give reasons: Why is HCl not used to acidify a permanganate solution in volumetric estimation of `Fe^(2+)` or `C_2O_4^(2-)`?

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ASSAM ACADEMIC CENTRE-The d and f-block elements-Example
  1. Name one ore of Manganese and Chromium.

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  2. Transition metel compounds are generally coloured. Why?

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  3. Give reasons: Why is HCl not used to acidify a permanganate solution i...

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  4. Why is copper sulphate pentahydrate coloured?

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  5. Why Zn, Cd and Hg are not regarded as transition element?

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  6. Write three general chracteristics of transition elements.

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  7. Why do transition elements show variable oxidation state?

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  8. What is spin only formula for calculation of magnetic moment? Calculat...

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  9. Write the method of preparation of potassium dichromate.

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  10. How potassium permanganate is prepared in the laboratory?

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  11. The electronic configuration of valence shell of Cr in the ground stat...

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  12. Both Cu and Zn have completely filled 3d atomic orbital. Cu is conside...

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  13. Cu, Ag and Au have completely filled d-orbitals yet they are regarded ...

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  14. In what way is the electronic configuration of the transition elements...

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  15. Complete the following reaction equation: Cr2O7^(2-) + Sn^2 + H^+ rarr

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  16. Complete the following reaction equation: MnO4^(-) + Fe^(2+) + H^+ rar...

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  17. What is meant by disproportionation? Give one example of disproportion...

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  18. What are alloys? Name one important alloy and give its uses.

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  19. Give reasons: What is lanthanoid contraction?

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  20. What are interstitial compounds? Mention principla physical and chemic...

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