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The s-Block Elements
Among CaH2, BeH2, BaH2, the order of ionic character is
BeH2< CaH2<BaH2
CaH2<BeH2<BaH2
BaH2<BeH2<CaH2
BeH2 < BaH2 < CaH2
A.
BeH2< CaH2<BaH2
Smaller the size cation, more will be its polarising power. Hence, BeH2 will be least ionic.
Or
On moving down the group metallic character of metals increases so ionic character of metal hydride increases.
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Lithium shows similarities to magnesium in the chemical behaviour. What is the cause of this similarity?
What is the nature of lithium compounds?
Group 1 elements are called alkali metals. Why?
Why caesium can be used in photoelectric cell while lithium can not be?
In aqueous solution, Li+ ion has lowest mobility. Why?
Lithium has highest ionisation energy in group 1 elements, yet it is strongest reducing agent. Comment.
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