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Chromium (Cr), Molybdenum (Mo) and Tungs...

Chromium (Cr), Molybdenum (Mo) and Tungsten '(W)' are hard metals whereas Zn, Cd Hg and are not so hard. Why?

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Cr. Mo and W have maximum ntimber.of unpaired electrons .therefore. stronger metallic bonds are present in them. Hence they are hard. Zn,Cd,Hg do not have any unpaired electrons. Hence they are not so hard.
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V PUBLICATION-THE d- AND f- BLOCK ELEMENTS-QUESTION BANK
  1. Calculate the magnetic moment of the divalent ion in aqueous solution ...

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  2. Actinoid contraction is greater from element to element than lanthanoi...

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  3. Chromium (Cr), Molybdenum (Mo) and Tungsten '(W)' are hard metals wher...

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  4. Cuprous ion (Cu+) can not be considered as a transition element while ...

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  5. The atomic radii of the second and third transition series are almost ...

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  6. d-block elements have high melting and boiling points. Why?

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  7. Manganese and technetium have very low melting points. Why?

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  8. Name the transition element with highest density?

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  9. K2PTCl6' is a well known compound while the corresponding nickel salt ...

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  10. Copper cannot liberate (H)(2). from acids. Why?

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  11. Copper is the onty elemerit in the 1st transition series with a posit...

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  12. All the bonds between manganese and oxygen in '(KMnO4 are covalent. Wh...

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  13. Which is the highest oxidation state shown by any transition mètal?

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  14. Cr(2)O(7)^(2-) is a strong oxidising agent whereas MoO(3) and WO(3) ar...

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  15. Highest fluoride of Mn is MnF(4), whereas highest oxide is Mn(2)O(7) ....

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  16. Draw the structure of Mn(2) O(7) ?

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  17. Name the catnlyst used in (i) the manufacture of sulphuric acid by con...

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  18. Name the catalyst used in i) the oxidation of ammonia to nitric acid b...

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  19. Transition elements act as catalysts. Why?

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  20. Why the transition metal compounds are coloured?

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