76. Among the following, ionic hydride is
(A) BH,
(B) SiH,
(C) MgH2
(D) PH,
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answer : option (C) MgH2
explanation : condition of ionic compound is
- electronegativity difference of combining atoms should be high.
- two atoms must be different in nature.
- ionisation potential of one atom must be small.
- electron affinity of second atom must be high.
here, in all options, only MgH2 is satisfying above all conditions.
ionisation potential of H is higher than Mg, electronegativity difference is also high in case of other options. and most important thing is that Mg is metal (electropositive character ) and H is considered as electronegative character that's why MgH2 is ionic hydride.
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