In the human body,if necessary,the plates,screws,or wires used for surgery are made up of:

Arrange the oxides $CrO$,$CrO_3$,and $Cr_2O_3$ in the decreasing order of acidic strength.

Give examples and suggest reasons for the following features of the transition metal chemistry:
$(i)$ The lowest oxide of transition metal is basic,the highest is amphoteric/acidic.
$(ii)$ $A$ transition metal exhibits highest oxidation state in oxides and fluorides.
$(iii)$ The highest oxidation state is exhibited in oxoanions of a metal.

When $KI$ and $CuSO_4$ solutions are mixed,the products formed are:

Among $K, Ca, Fe,$ and $Zn$,the element which can form more than one binary compound with chlorine is

Iron may be rendered passive by treatment with a concentrated solution of