Which of the following cannot form oxo ion?

P u O_{2}^{+}

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C e O_{2}^{+}

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U O_{2}^{2 +}

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N p O_{2}^{+}

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Solution

The correct option is A $C e O_{2}^{+}$
$C e O_{2}^{+}$ is not possible as cerium cannot form oxo ion.

Lanthanoids cannot form oxo ions while actinides can form oxo ions like $U O^{+}, U O_{2}^{+}, P u O_{2}^{2 +}$ .

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U O_{2} + {C r}_{2} O_{7}^{2 -} ⟶ U O_{2}^{2 +} + {C r}^{2 +} + H_{2} O

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