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Q.

Which of the following can act as both oxidizing and reducing agent
i) SO2 
ii) HNO3 
iii) HNO2 
iv) HClO4

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a

SO2, HNO2

b

HNO2, HNO3

c

HNO2, HClO4

d

HClO4, SO2

answer is A.

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Detailed Solution

detailed_solution_thumbnail
  • SO2 Oxidation state of S =+4 ,least & highest O.S 's are -2 & +6 ; so undergoes both oxidation and reduction.
  • HNO2 Oxidation state of N =+3 ,least & highest O.S 's are -3 &+5 ; so undergoes both oxidation and reduction.
  • HNO3 Oxidation state of N =+5 ,least & highest O.S 's are -3 &+5 ; so undergoes   reduction only.
  • HClO4 Oxidation state of Cl =+7 ,least & highest O.S 's are -1 &+7 ; so undergoes   reduction only.
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