Which of the following statements about the interstitial compounds is incorrect ? (NEET 2013) P ...

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Which of the following statements about the interstitial compounds is incorrect ?
(NEET 2013)
P
(a) They are much harder than the pure metal.
(b) They have higher melting points than the pure metal.
W
(c) They retain the metallic conductivity.
(d) They are chemically reactive.
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