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NEET2017Chemistryp Block Elements (Group 15, 16, 17 & 18)Actual

In which pair of ions do both the species contain S - S bond?

Options

  1. AS 2 O 7 2 - ,   S 2 O 3 2 -
  2. BS 4 O 6 2 - ,   S 2 O 3 2 -
  3. CS 2 O 7 2 - ,   S 2 O 8 2 -
  4. DS 4 O 6 2 - ,   S 2 O 7 2 -

Correct answer

B. S 4 O 6 2 - ,   S 2 O 3 2 -

Step-by-step solution

The name of the given anions: S 4 O 6 2- = Tetrathionate ion S 2 O 3 2- = Thiosulfate ion S 2 O 8 2- = Peroxydisulfate ion S 2 O 7 2- = Disulfate ion Both S 4 O 6 2 - and S 2 O 3 2 - has   S - S bond as they both occurs in salt of dithionic acid which is stable i.e., H 2 S 2 O 6 .

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