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 acids and strong alkalis. C gives an aqueous solution which is strongly alkaline. Which of the following statements is/are true?
The three elements are metals.
The electronegativities decrease from X to Y to Z.
The atomic radius decreases in the order X, Y and Z.
X, Y and Z could be phosphorus, aluminium and sodium respectively.
a. I, II, III only correct
b. I, III only correct
c. II, IV only correct
d. II, III, IV only correct