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The S-Block Elements

Question

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Among CaH₂, BeH₂, BaH₂, the order of ionic character is

BeH₂< CaH₂<BaH₂

CaH₂<BeH₂<BaH₂

BaH₂<BeH₂<CaH₂

BeH₂ < BaH₂ < CaH₂

Solution

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.

Some More Questions From The s-Block Elements Chapter

Why are alkali metals not found in nature?

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.

The softness of group 1 elements increases down the group with increasing atomic number. Give reason.

Which is the most reactive alkali metal and why?

Why alkali metals do not form M²⁺ions?

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