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A, B and C are hydroxy-compounds of the ...

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

I, II, III only correct

B

I, III only correct

C

II, IV only correct

D

II, III, IV only correct

Text Solution

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The correct Answer is:
C
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