Transition metals, when they form interstitial compounds, the non-metals \( (\mathrm{H}, \mathrm...

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Transition metals, when they form interstitial compounds, the non-metals \( (\mathrm{H}, \mathrm{B}, \mathrm{C}, \mathrm{N}) \) are accomodated in :
(a) voids or holes in cubic-packed structure
(b) tetrahedral voids
(c) octahedral voids
(d) all of these
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