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Zr and Hf have almost identical atomic r...

Zr and Hf have almost identical atomic radii. Give reason.

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Poor shielding of 4f electrons decreases the size of Hf due to lanthanoid contraction. Hence it maintain the size equiavlent to Zr.
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SUBHASH PUBLICATION-THE 'd' - AND 'f' - BLOCK ELEMENTS -Question and Answer
  1. What happens when lanthanoids are heated in Carbon?

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  2. How lanthanoids reacts with water and dil. Acids?

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  3. What is mischmetall? Give its one use.

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  4. What is actinoid contraction? Why actinoid contraction is greater than...

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  5. Give reason: Actinoid contraction is greater from element to element t...

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  6. Give general oxidation state of actinoids. Why actinoids shows variabl...

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  7. Zr and Hf have almost identical atomic radii. Give reason.

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  8. Give reasons: Actinoids show variable oxidation states.

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  9. Give reasons: Zr and Hf have almost identical radii.

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  10. Give reason: Why Lanthanoids are less reactive than actinoids.

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  11. Out of the following elements identify the element which does not exhi...

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  12. Give Reason. Most of the transition metals have high melting point a...

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  13. Give Reason. Second ionisation enthalpy of copper is exceptionally h...

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  14. Give reason. Atomic size of 4d and 5d series elements are almost the...

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  15. Study of actinoid elements is difficult. Give two reasons.

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  16. Give reasons : Cerium (Ce) exhibits +4 oxidation state

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  17. Among Fe^(2+) and Fe^(3+) which is more stable? Give reason.

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  18. Give reason: Mn exhibits the higher oxidatoin state of +7 among 3d s...

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  19. Give reason: Cu^(2+) is paramagnetic and Cu^(+) is diamagnetic.

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  20. Give reason 'transition metals generally form coloured compound'.

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