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Q.

Which of the following elements do not form hydrides?

(I) Noble gases

(II) Elements of groups 7th, 8th and 9th

(III) Mo and W

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a

(I) only

b

(I) and (II)

c

(I) and (III)

d

All (I), (II) and (III)

answer is D.

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Detailed Solution

  • The metals of group 7, 8, and 9 do not form hydrides. This region is referred as Hydride gap in modern periodic table.
  • Examples of such elements are Mn, Fe, Co, Ru etc. These elements do not form hydrides on account of low affinity for hydrogen in their normal oxidation stat
  • Noble gases do not form hydrides due to chemically inert.
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