Choose the correct statement. $Fe^{3+}$ ion is more stable than $Fe^{2+}$ ion because
- AMore the charge on the atom,more is its stability
- BConfiguration of $Fe^{2+}$ is $3d^6$ while $Fe^{3+}$ is $3d^5$
- C$Fe^{2+}$ has a larger size than that of $Fe^{3+}$
- D$Fe^{3+}$ ions are coloured
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Out of all the known elements,the percentage of transition elements is approximately $......\%$
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Which element of the $3d$-series has the highest third ionisation enthalpy?
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