Which of the following statement(s) is/are correct? (a) Metallic hydrides are deficient of hydro...

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Which of the following statement(s) is/are correct?
(a) Metallic hydrides are deficient of hydrogen.
(b) Metallic hydrides conduct heat and electricity.
(c) Ionic hydrides do not conduct electricity in solid state.
(d) Ionic hydrides are very good conductors of electricity in solid state.
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