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Question

Which of the following elements will form an acidic oxide?


A

An element with atomic number 12

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B

An element with atomic number 3

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C

An element with atomic number 7

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D

An element with the atomic number 19

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Solution

The correct option is C

An element with atomic number 7


Explanation for the correct option:

(c) An element with an atomic number 7

  • The element with atomic number 7 has electron configuration 2,5
  • It means it may gain three electrons and is electronegative.
  • It should be a nonmetal, as nonmetals gain electrons
  • As non-metals produce acidic oxide
  • Hence this option is correct

Explanation for the incorrect options:

(a) An element with an atomic number 12

  • The element with atomic number 12 has the electron configuration 2,8,2
  • It means it may lose two electrons and is electropositive.
  • It should be a metal, as metals lose electrons
  • As metals produce basic oxide
  • Thus, this option is incorrect.

(b) An element with an atomic number 3

  • The element with atomic number 3 has the electron configuration 2,1
  • It means it may lose one electron and is electropositive.
  • It should be a metal, as metals lose electrons
  • As metals produce basic oxide
  • Thus, this option is incorrect.

(d) An element with the atomic number 19

  • The element with atomic number 19 has the electron configuration 2,8,8,1
  • It means it may lose one electron and is electropositive.
  • It should be a metal, as metals lose electrons
  • As metals produce basic oxide
  • Thus, this option is incorrect.

Hence the correct option is (c ) An element with an atomic number


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