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Question

Which of the following are peroxoacids of sulfur?


A

H2SO5 and H2S2O8

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B

H2SO5 and H2S2O7

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C

H2S2O7 and H2S2O8

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D

H2S2O6 and H2S2O7

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Solution

The correct option is A

H2SO5 and H2S2O8


Explanation for correct option

(A) H2SO5 and H2S2O8

Peroxoacids of sulphur

  • In the case of sulfur, a considerable number of oxyacidsā€”either in the free state, in the form of salts, or bothā€”are known.
  • Peroxoacids of sulfur are the name for acids that have an O-O bond.
  • Peroxy linkage denotes the presence of an oxygen-oxygen (O-O) bond within a molecule.

H2SO5

  • Two hydrogen atoms, one sulfide atom, and five oxygen atoms make up H2SO5 .
  • All atoms require a total of 38 valence electrons in order to adopt the noble gas structure.
  • Hence. it is the peroxoacids of sulfur.
  • Structure of H2SO5:
  • Peroxymonosulfuric acid - Wikipedia

H2S2O8

  • Two hydrogen atoms, two sulfide atoms, and eight oxygen atoms make up the compound H2S2O8.
  • Thus, H2S2O8 contains 62 valence electrons in total.
  • All atoms require 62 valence electrons in total to adopt the noble gas structure.
  • Hence. it is the peroxoacids of sulfur.
  • Structure of H subscript bold 2 S subscript bold 2 O subscript bold 8 :

The explanation for incorrect options

(B) H2SO5 and H2S2O7

  • Two hydrogen atoms, two sulfide atoms, and seven oxygen atoms make up the compound H2S2O7.
  • H2S2O7 contains 56 valence electrons in total.
  • All atoms require 56 valence electrons in total for the formation of the noble gas configuration.
  • Hence, it is not the peroxoacids of sulfur.

(C) H2S2O7 and H2S2O8

  • H2S2O7 is not the peroxoacids of sulfur.
  • Two hydrogen atoms, two sulfide atoms, and eight oxygen atoms make up the compound H2S2O8.
  • Thus, H2S2O8 contains 62 valence electrons in total.
  • All atoms require 62 valence electrons in total to adopt the noble gas structure.
  • Hence, it is the peroxoacids of sulfur.

(D) H2S2O6 and H2S2O7

  • Two hydrogen atoms, two sulfide atoms, and six oxygen atoms make up the compound H2S2O6.
  • H2S2O6 contains 50 valence electrons in total.
  • All atoms require a total of 50 valence electrons in order to adopt the noble gas structure.
  • Hence, it is not the peroxoacids of sulfur.
  • H2S2O7 is not the peroxoacids of sulfur.

Therefore, the correct option is (A) H2SO5 and H2S2O8.


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