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![[Post New]](/templates/default/images/icon_minipost_new.gif) 4 May 2008 15:12:30 IST
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which is a covalent hydride?
1)NaH 2)BeH2 3)LaH3 4)AsH3
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option b )
BeH2
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8 May 2008 00:35:57 IST
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BeH2
fazans rule - smaller the size of cation greater is the covalent character
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8 May 2008 11:50:27 IST
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the correct ans is d) AsH3
acc to me it shud be BeH2....as ashish said acc to fajan rule..since size of be is very small......but the ans given in mtg practice papers for bitsat is d
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8 May 2008 11:52:35 IST
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BeH2 ...cuz all compounds of Be are covalent only ...Be forms covalent compounds only .
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Ken
From: UNITED STATES, Green Bay, Wisconsin
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8 May 2008 17:45:26 IST
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it shud be 2) only
as stated by fazan's rule
maybe answer is wrong der
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8 May 2008 23:11:13 IST
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fajan's rule means increase in ionic character of bond due to presence of small cation.....its high +ve charge density attracts electrons from anion or something related, and hence the bond becomes more ionic.
all the given hydrides are ionic so there is no question of fajan's rule... but BeH2 is least ionic because Be is least electropositive.
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