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Calculate the number of unpaired electro...

Calculate the number of unpaired electrons in `Cr^(3+)` and `V^(3+)` ions.

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MODERN PUBLICATION-D AND F-BLOCK ELEMENTS-REVISION EXERCISES ( SHORT ANSWER QUESTION)
  1. (i) What is the most common oxidation state of the actinoids? (ii) Why...

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  2. Zn^(2+) salt are white while Cu^(2+) salts are blue. Assign reason.

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  3. Calculate the number of unpaired electrons in Cr^(3+) and V^(3+) io...

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  4. How will you account for the following: (a) Actinoids exhibit more num...

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  5. (i) What are interstitial compounds ? (ii) Transition metals show good...

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  6. (a) Define transition metals. (b) Why do transition metals form colour...

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  7. (a) What is lanthanoid contraction and write its consequences ? (b) Dr...

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  8. (a) Why are Zn, Cd and Hg not regarded as transition metals? (b) Why d...

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  9. (a) How will you prepare KMnO4 from pyrolusite ore ? (b) Complete the...

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  10. (a) Why do transition metals act as good catalysts? (b) Why do transit...

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  11. (a) Indicate the steps in the preparation of K2Cr2O7 from chromite ore...

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  12. When MnO2 is fused with KOH in the presence of KNO2 as an oxidising ag...

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  13. Give reasons for the following: (i) Transition elements and their co...

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  14. Give reasons for the following: (i) Transition metals form alloys....

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  15. How would you account for the following? (i) Cr^(2+) is reducing...

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  16. How would you account for the following ? (i) Among lanthanoids, ...

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  17. Explain the following observations: (i) Many of the transition element...

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  18. Why do the transition elements have higher enthalpies of atomisation? ...

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  19. (a) How would you account for the following: (i) The chemistry of ...

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  20. Complete and balance the following chemical equations: (a) Fe^(2+) ...

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