Which of the following statements is incorrect? (a) Ionic hydrides are stoichiometric compounds o...

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Which of the following statements is incorrect?
(a) Ionic hydrides are stoichiometric compounds of dihydrogen formed with most of s-block elements
(b) Ionic hydrides are crystalline, non-volatile and nonconducting in solid state.
(c) Melts of ionic hydrides conduct electricity and liberate dihydrogen gas at cathode.
(d) Both (a) and (c)

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