Which of the following statement(s) is/are correct? (a) Elements of group 15 form electron defic...

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Which of the following statement(s) is/are correct?
(a) Elements of group 15 form electron deficient hydrides.
(b) All elements of group 14 form electron precise hydrides.
(c) Electron precise hydrides have tetrahedral geometries.
(d) Electron rich hydrides can act as Lewis acids.
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