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17/09/2020 11:43 am
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Three elements X, Y and Z are in the 3rd period of the periodic table. The oxides of X, Y and Z, respectively, are basic, amphoteric and acidic. The correct order of the atomic numbers of X, Y and Z is:
(1) X < Y < Z
(2) Z < Y < X
(3) X < Z < Y
(4) Y < X < Z
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17/09/2020 11:50 am
Correct answer: (1) X < Y < Z
Explanation:
On moving left to right in a period.
Acidic character of oxides is increase.
3rd period element oxides.
Na2O, MgO → Basic
Al2O3 → Amphoteric
SiO2, P2O5, Cl2O7 → Acidic
(i) Acidic character↑
(i) Atomic No↑
So X have minimum Atomic No & Z have maxima Atomic No
So correct order is X < Y < Z