Two compounds of Iron are given below

FeSO4 , Fe2(SO4)3 (the oxidation state of sulphate radical is -2)

(a)Which of these compounds show +2 oxidation state for Iron?

(b) Which compound has Fe3+ ion?

(c)Write the subshell electronic configuration of Fe3+ ion.

(d) Why do the transition elements show variable oxidation states?

3. Identify the incorrect electronic configuration and correct them

(i) 1s2,2s2,2p3

(ii)1s2,2s2,2p6,3s1

(iii)1s2,2s2,2p6,2d7

(iv)1s2,2s2,2p6,3s2,3p6,3d4