TS EAMCET 06 May 2019 Shift 1 Solved Paper

Which one among the following statements is/are not correct?
a) Ba compounds, generally are more covalent than Be compounds
b) The electron gain enthalpy of He is positive
c) The oxidation state of O in OF2 and Na2O are same
d) The radius of Na+ ion is smaller than that of F ion