NEETChemistryRedox Reactions
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The oxidation state of sulphur in H₂S₂O₈ (Marshall's acid) is +6. Reason (R): H₂S₂O₈ contains one peroxide linkage ( - O - O - ) in its structure. In the light of the above statements, choose the most appropriate answer from the options given below:
Options
- ABoth Assertion (A) and Reason (R) are correct but Reason (R) is not the correct explanation for Assertion (A)
- BAssertion (A) is correct but Reason (R) is incorrect
- CBoth Assertion (A) and Reason (R) are correct and Reason (R) is the correct explanation for Assertion (A)
- DAssertion (A) is incorrect but Reason (R) is correct
Correct answer
C. Both Assertion (A) and Reason (R) are correct and Reason (R) is the correct explanation for Assertion (A)
Step-by-step solution
Assertion (A) is correct: The maximum oxidation state of sulphur (Group 16) cannot exceed +6. In H₂S₂O₈ , the oxidation state of sulphur is indeed +6. Reason (R) is correct and explains Assertion (A): If the oxidation state of sulphur is calculated algebraically assuming all oxygen atoms are in the -2 oxidation state, the result is 2x + 8(-2) = 0 x = +8 , which is impossible. The structure of Marshall's acid is HO-SO₂-O-O-SO₂-OH . It contains one peroxide linkage ( - O - O - ) where two oxygen atoms have an oxidati