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Q.

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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a

P, Q, R only correct

b

Q, R, S only correct

c

P, R only correct

d

Q, S only correct

answer is D.

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Detailed Solution

A → acidic oxide; (non-metal) (X)

 B → amphoteric oxide (Y)

 C → basic oxide (metal) (Z)

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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