Answer:
(b) The ionic nature increases
as the electro negativity difference increases from Li to Cs.
\[\underset{1.1}{\mathop{LiH}}\,~~~\underset{1.2}{\mathop{NaH}}\,~~~\underset{~1.3}{\mathop{~KH~}}\,~~\underset{1.3}{\mathop{RbH}}\,~~~~\underset{~~1.4}{\mathop{CsH}}\,\]
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