Choose the correct option
I. O.S of ‘O’ in OF2 is –2
II. Ionisation enthalpy is the minimum amount of energy required to remove an electron from an atom
III. Screening effect : it is the attraction of electron towards the nuclear
IV. Half filled orbitals are more stable half fully filled orbitals
(a) TTTT
(b) FFFF
(c) TTFT
(d) TFFT