The element with which of the following outer electron configuration may exhibit the largest number of oxidation states in its compounds?
- A$3d^5\, 4s^2$
- B$3d^8\, 4s^2$
- C$3d^7\, 4s^2$
- D$3d^6\, 4s^2$
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Which of the following ions is diamagnetic?
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| $(A)$ Element that can show $+8$ oxidation state | $(1)$ $Mn$ |
| $(B)$ $3d$ series element that can show up to $+7$ oxidation state | $(2)$ $Cr$ |
| $(C)$ $3d$ series element with maximum melting point | $(3)$ $Os$ |
| $(4)$ $Fe$ |
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