The following are the statements regarding polarising power of IIA group cationsi) Be always forms covalent compounds due to high polarising power of Be+2 ionsii) Be always form covalent compounds due to low polarising power of Be+2 ionsiii) Polarising power of IIA cations decreases from Be+2 ion to Ba+2 ion

BeCl2 > MgCl2 > CaCl2 > SrCl2 > BaCl2 : percentage covalent character As the size of cation decreases, effective nuclear charge decreases, and hence polarising power of cation decreases,Distortion of electron cloud in anion by cation decreases, hence sharing property of electron pair in M-Cl bond decreases Therefore statement-I and Statement - III are correct