Three elements X, Y and Z are in the 3 ^ rd 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:

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Correct answer: B. X < Y < Z

On moving left to right in a period. Acidic character of oxides is increase.

{3}^{\text{rd}}

period element oxides.

\mathop{\mathop{{Na}_{2}O}_{⏟}}_{\text{Basic}}MgO\mathop{\mathop{{Al}_{2}{O}_{3}}_{⏟}}_{\text{Amphoteric}}\mathop{\mathop{{SiO}_{2}{P}_{2}{O}_{5}{Cl}_{2}O7}_{⏟}}_{\text{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

Three elements X, Y and Z are in the 3 ^ rd period of the periodic...

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