MHT CET202618 April 2026Evening ShiftChemistryRedox ReactionsActual

What is the oxidation number of carbon in oxalic acid ?

Options

Correct answer

B. +3

Step-by-step solution

The chemical formula of oxalic acid is H₂C₂O₄ . Let the oxidation number of carbon be x . The oxidation number of hydrogen is +1 and that of oxygen is -2 . The sum of oxidation numbers of all atoms in a neutral molecule is zero. 2(+1) + 2(x) + 4(-2) = 0 2 + 2x - 8 = 0 2x - 6 = 0 2x = 6 x = +3 The oxidation number of carbon in oxalic acid is +3 . Answer: +3

Practice Redox Reactions on Quantrex Academy →

More from Redox Reactions

x moles of K₂ Cr₂ O₇ oxidises 1 mole of ferrous oxalate, in acidic medium. Hence 'x' is: 2026 In the redox reaction, taking place in acidic medium: X MnO ₄^- (aq) + Y SO ₂(g) Mn ⁺²(aq) + HSO ₄^- (aq) , the ratio of X:Y in a stoichiometrically balanced equation will be 2026 In the reaction, Cr ₂ O ₇²⁻ + 4 H ₂ O ₂ + 2 H ^+ 2 CrO ₅ + H ₂ O The change in oxidation state of Cr is: 2026 What are the numbers of protons ( H ^+ ) and electrons ( e ^- ), respectively, required for the reduction of [ Cr ₂ O ₇]²⁻ to Cr ³⁺ under an aqueous acidic condition? 2026 Given below are two statements. Statement-I: In H ₂ O ₂ , each oxygen atom is assigned an oxidation number of -1 , in RbO ₂ each oxygen atom is assigned an oxidation number of - 1 2026 a C ₂ O ₄²⁻ + b MnO ₄^- + c H ^+ x Mn ²⁺ + y H ₂ O + z CO ₂ a and x respectively are 2026 What is the number of electrons gained by Cl atom when n mole of ClO ₄^- is transformed into n mole of ClO ₂^- ion? 2026 What is the oxidation number of Cl in HOClO ₂ ? 2026 Full Redox Reactions list All MHT CET PYQs