$(ii)$ $Cr _{2} O _{3}$ is an amphoteric oxide.
$(iii)$ $\operatorname{In} RuO _{4},$ $'Ru'$ is in $+8$ oxidation state. So it act as oxidising agent.
$(iv)$ Red colour of ruby is due to the presence of $Cr ^{+3}$ ions in $Al _{2} O _{3}$
$(I)$ $TeF_6$ $(II)$ $SF_6$ $(III)$ $NCl_3$ $(IV)$ $NF_3$
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