How to solve this ? 17. 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?
I. The three elements are metals
II. The electronegativities decreases from X to Y to
z.
Ill. The atomic radius decreases in the order X, Y
and Z.
I V. X, Y and Z could be phosphorus, aluminium and
sodium, respectively,
(a) I, II, Ill only correct
(b) I and Ill only correct
(c) II, IV only correct .
(d) 11, HI and IV only
