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Question

NaCl molecule is made of which of the following ions?


A

Na+ and Cl-

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B

Na-and Cl+

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C

Na- and C+

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D

Na+ and C-

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Solution

The correct option is A

Na+ and Cl-


Explanation for Correct Answer:

Option (A) Na+ and Cl-

  • Sodium chloride NaCl is an ionic compound
  • One molecule of Sodium chloride is composed of one Sodium (Na) atom and one Chlorine (Cl) atom as indicated by the chemical formula.
  • The atomic number of Sodium(Na) is 11 and the electronic configuration can be written as 1s22s22p63s1
  • The atomic number of Chlorine(Cl) is 17 and the electronic configuration can be written as 1s22s22p63s23p5
  • Here, Chlorine needs one more electron to complete its outermost shell
  • Thus, Sodium donates one electron and gets a positive charge, and Chlorine accepts that electron and gets a negative charge

  • NaCl is water-soluble and it forms Sodium cation and Chloride anion.
  • The sodium and chloride ions are present in the ratio of 1:1
  • Hence option (A) is correct

Explanation for incorrect Answers:

Option (B) Na-and Cl+

  • In NaCl molecule, Sodium donates one electron and gets a positive charge to form Na+, and Chlorine accepts that electron and gets a negative charge to form Cl-.
  • Hence incorrect option.

Option (C) Na- and C+

  • NaCl molecules contain Sodium and Chlorine ions.
  • Hence incorrect option.

Option (D) Na+ and C-

  • NaCl molecules does not contains carbon molecules.
  • Hence incorrect option.

Therefore, option (A) Na+ and Cl-is the correct answer.


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