\( \mathrm{A}, \mathrm{B} \) and \( \mathrm{C} \) are hydroxy-compo...

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\( \mathrm{A}, \mathrm{B} \) and \( \mathrm{C} \) are hydroxy-compounds of the elements \( \mathrm{X}, \mathrm{Y} \) and \( \mathrm{Z} \) respectively. \( \mathrm{X}, \mathrm{Y} \) and \( \mathrm{Z} \) are in the same period of the periodic table. A gives an aqueous solution of \( \mathrm{pH} \) less than seven. \( \mathrm{B} \)
\( \mathrm{P} \) reacts with both strong acids and strong alkalies. C gives an aqueous solution which is strongly

W alkaline.
Which of the following statements is/are true?
I : All the three elements are metals.
II : The electronegativities decrease from \( \mathrm{X} \) to \( \mathrm{Y} \) to \( \mathrm{Z} \).
III : The atomic radius decreases in the order \( \mathrm{X}, \mathrm{Y} \) and \( \mathrm{Z} \).
IV : \( \mathrm{X}, \mathrm{Y} \) and \( \mathrm{Z} \) 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
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