The set of correct statements is:
$(i)$ Manganese exhibits $+7$ oxidation state in its oxide.
$(ii)$ Ruthenium and Osmium exhibit $+8$ oxidation in their oxides.
$(iii)$ $Sc$ shows $+4$ oxidation state which is oxidizing in nature.
$(iv)$ $Cr$ shows oxidising nature in $+6$ oxidation state.
$(ii)$ and $(iii)$
$(i), (ii)$ and $(iv)$
$(i)$ and $(iii)$
$(ii), (iii)$ and $(iv)$
An ornamental of gold having $75\%$ of gold, it is of .............. carat.
The ionic radius of $Cr$ is minimum is which of the following compounds
Cuprous ion is colourless, while cupric ion is coloured because
Stainless steel does not rust because
Spiegeleisen is an alloy of