A, B and C are hydroxy-compounds of the elements X, Y and Z respectively. X, Y and Z are in the same period of the periodic table. A Gives an aqueous solution of pH less than seven. B reacts with both strong acid and strong alkalis. C gives an aqueous solution which is srongly alkaline. which of the following statements is/are true? I: The three elements are metals. II: The electronegativities decreases from X to Y to Z. III: The atomic radius decreases in the order X, Y and Z. IV: X, Y and Z could be phosphorus, aluminium and sodium respectively.

A, B and C are hydroxy-compounds of the elements X, Y and Z respective

1.	A, B and C are hydroxy-compounds of the elements X, Y and Z respectively. X, Y and Z are in the same period of the periodic table. A Gives an aqueous solution of pH less than seven. B reacts with both strong acid and strong alkalis. C gives an aqueous solution which is srongly alkaline. which of the following statements is/are true? I: The three elements are metals. II: The electronegativities decreases from X to Y to Z. III: The atomic radius decreases in the order X, Y and Z. IV: X, Y and Z could be phosphorus, aluminium and sodium respectively.
Answer» I, II, III only correct I, III only correct II, IV only correct II, III, IV only correct Answer :C