JEE Mains · Chemistry · STD 11 - 7. Redox reactions
Which of the following sets includes all the species that will change the orange colour of \(K_2Cr_2O_7\) in acidic medium?
- A \(Fe^{2+}, Sn^{2+}, I^-, S^{2-}\)
- B \(S^{2-}, Fe^{3+}, I^-, C_2O_4^{2-}\)
- C \(Fe^{2+}, NO_2^-, SO_2, Sn^{4+}\)
- D \(Fe^{3+}, SO_4^{2-}, S^{2-}, Sn^{4+}\)
Answer & Solution
Correct Answer
(A) \(Fe^{2+}, Sn^{2+}, I^-, S^{2-}\)
Step-by-step Solution
Detailed explanation
\(K_2Cr_2O_7\) in acidic medium acts as a strong oxidizing agent. It changes its colour from orange (\(Cr_2O_7^{2-}\)) to green (\(Cr^{3+}\)) when it reacts with a reducing agent. We need to identify the set in which all species can act as reducing agents (i.e., they can be…
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