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Question

The molecular formula of ammonium sulphate is


A

(NH4)2SO4

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B

NH2SO4

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C

NH4SO4

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D

None of these

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Solution

The correct option is A

(NH4)2SO4


The explanation for the correct option:

A. (NH4)2SO4

Molecular formula:

  • “A molecular formula determines the number of atoms of each element in a compound.”
  • The molecular formula of Ammonium sulfate is (NH4)2SO4.
  • The given molecular formula is (NH4)2SO4 as ammonium ion NH4+ has +1 charge and sulphate ion SO42-has -2 charge. for the neutrality of charges in the molecule, there will be 2 in the subscript of NH4+ ion.
  • Hence, the correct molecular formula is (NH4)2SO4.

The explanation for incorrect options:

B. NH2SO4

  • The formula of ammonium ion is incorrect. the formula of ammonium ion is NH4+ not NH2+.

C. NH4SO4

  • The ammonium ion bears +1 charge. However, in the given formula, the charge on the ammonium ion is +2 which is cancelled out with the charge on the sulphate ion SO42- for neutrality.

Hence, the correct option is A i.e. (NH4)2SO4.


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