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प्रश्न
Why first ionisation enthalpy of Cr is lower than that of Zn?
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उत्तर
The electronic configuration of chromium and zinc are respectively:
\[\ce{Cr (24) = [Ar] 3d^5 4s^2}\]
\[\ce{Zn (30) = [Ar] 3d^10 4s^2}\]
It is easy to remove electron from 4s1-orbital (unpaired) rather than from 4s2-orbital (paired).
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संबंधित प्रश्न
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| Column I (Property) | Column II (Metal) | |
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| (ii) | Element with highest third ionisation enthalpy |
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| (iii) | \[\ce{M}\] in \[\ce{M(CO)6}\] is | (c) \[\ce{Cu}\] |
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