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JEE Main20202 Sep 2020Evening ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

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:

Options

  1. AZ   <   Y   <   X
  2. B  X <   Y   <   Z
  3. C  X   <   Z   <   Y
  4. DY   <   X   <   Z

Correct answer

B.   X <   Y   <   Z

Step-by-step solution

On moving left to right in a period. Acidic character of oxides is increase. 3 rd  period element oxides. Na 2 O               ⏟ Basic  MgO    Al 2 O 3 ⏟ Amphoteric     SiO 2             P 2 O 5                 Cl 2 O 7 ⏟ Acidic  (i) Acidic character ↑ (i) Atomic No ↑ so X have minimum Atomic No & Z have maxima Atomic No So correct order is X

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