MCQ
The number of valence electrons present in the metal among $\mathrm{Cr}, \mathrm{Co}, \mathrm{Fe}$ and Ni which has the lowest enthalpy of atomisation is
- A8
- B9
- C6
- D10
✓
Answer
C. 6
Out of $\mathrm{Cr}, \mathrm{Co}, \mathrm{Fe}$ and Ni
Chromium has lowest heat of atomisation.
$\mathrm{Cr}=[\mathrm{Ar}] 3 \mathrm{~d}^{5} 4 \mathrm{~s}^{1}$
$\because$ Total six valence $\mathrm{e}^{-}$in Cr.
Out of $\mathrm{Cr}, \mathrm{Co}, \mathrm{Fe}$ and Ni
Chromium has lowest heat of atomisation.
$\mathrm{Cr}=[\mathrm{Ar}] 3 \mathrm{~d}^{5} 4 \mathrm{~s}^{1}$
$\because$ Total six valence $\mathrm{e}^{-}$in Cr.
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