Q. The electronic configuration of four elements are :
(I) $[Kr] 5 s^{1}$
(II) $[R n] 5 f^{- 14} 6 d^{1} 7 s^{2}$
(III) $[A r] 3 d^{10} 4 s^{2} 4 p^{5}$
(IV) $[A r] 3 d^{6} 4 s^{2}$
Consider the following statements:
(i) $I$ shows variable oxidation state
(ii) $II$ is a $d$ -block element
(iii) The compound formed between $I$ and $III$ is covalent
(iv) $I V$ shows single oxidation state
Which statement is True $(T)$ or False $(F)$ ?

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Solution: