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Question

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 :

A
X<Y<Z
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B
Z<Y<X
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C
X<Z<Y
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D
Y<X<Z
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Solution

The correct option is A X<Y<Z
On moving left to right in a period, acidic character of oxides increases.
3rd period element oxides:

On moving from left to right in 3rd period,
Acidic character
Atomic number
So, Z have maximum atomic number
& X have minimum atomic Number.
So, correct order is X<Y<Z
Correct option is (a).

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