Multiple choice Which of the following is the correct order of polarising powers of cations? K+ < Be2+ < Mg2+ < Ca2+ K+ < Ca2+ < Mg2+ < Be2+ Ca2+ < Mg2+ < Be2+ < K+ Be2+ < Mg2+ < Ca2+ < K+ Be2+ < Ca2+ < Mg2+ < K+ Reveal answer Fill a bubble to check yourself B Correct answer Explanation The correct order of polarising powers is K+ < Ca2+ < Mg2+ < Be2+.