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A, B and C are oxides of elements X, Y and Z respectively. X, Y and Z are in the same period of the periodic table. A gives an aqueous solution which turns blue litmus red. B reacts with both strong acids and strong alkalies. C gives an aqueous solution which is strongly alkaline.
Which of the following stateme.nt is/are true?
(P) All the three elements are metals
(Q) The electronegativities decreases from X to Y to z.
(R) The atomic radius increases in the order X < Y <z.
($) X, Y and Z could be phosphorus, aluminium and sodium respectively

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P, Q, R only correct

Q, R, S only correct

P, R only correct

Q, S only correct

answer is D.

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Detailed Solution

A $\to$ acidic oxide; (non-metal) (X)

B $\to$ amphoteric oxide (Y)

C $\to$ basic oxide (metal) (Z)

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