NEET UG Redox Reactions — practice questions
35 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice NEET UG Redox Reactions in the app →In terms of electron transfer, which statement correctly defines oxidation and reduction?Consider the reaction $2\mathrm{Na}(s) + \mathrm{Cl}_2(g) \rightarrow 2\mathrm{NaCl}(s)$. Identify the oxidisiIn the reaction $\mathrm{H}_2\mathrm{S}(g) + \mathrm{Cl}_2(g) \rightarrow 2\mathrm{HCl}(g) + \mathrm{S}(s)$, wIn the thermite reaction $3\mathrm{Fe}_3\mathrm{O}_4(s) + 8\mathrm{Al}(s) \rightarrow 9\mathrm{Fe}(s) + 4\mathWhat is the oxidation number of sulphur in $\mathrm{H}_2\mathrm{SO}_4$? Apply the standard rules: H is $+1$, OWhich one of the following reactions is a DISPROPORTIONATION reaction — i.e., a reaction in which the same eleIn the older, classical view of redox reactions (before electron-transfer was understood), OXIDATION was definIn the modern electron-transfer view, a REDUCING AGENT isWhich of the following best classifies as a COMBINATION redox reaction (i.e. two or more substances combine toWhich of the following is a DECOMPOSITION redox reaction?The reaction $\mathrm{Zn}(s) + \mathrm{CuSO}_4(aq) \rightarrow \mathrm{ZnSO}_4(aq) + \mathrm{Cu}(s)$ is best cWhat is the oxidation number of manganese in potassium permanganate, $\mathrm{KMnO}_4$? (K is $+1$, O is $-2$ What is the oxidation number of chromium in potassium dichromate, $\mathrm{K}_2\mathrm{Cr}_2\mathrm{O}_7$?In the thiosulphate ion $\mathrm{S}_2\mathrm{O}_3^{2-}$, what is the AVERAGE oxidation number of sulphur?How many electrons are transferred per dichromate ion when $\mathrm{Cr}_2\mathrm{O}_7^{2-}$ is reduced to $\maBalance the half-reaction $\mathrm{MnO}_4^- \rightarrow \mathrm{Mn}^{2+}$ in acidic medium. How many electronsDetermine the oxidation number of oxygen in oxygen difluoride, $\mathrm{OF}_2$. (Note: F is the most electroneConsider the laboratory preparation of chlorine: $2\mathrm{KMnO}_4 + 16\,\mathrm{HCl} \rightarrow 2\,\mathrm{KWhat is the AVERAGE oxidation number of sulphur in the tetrathionate ion $\mathrm{S}_4\mathrm{O}_6^{2-}$?In the reaction $\mathrm{H_2O_2}(aq) + \mathrm{Cl}_2(g) \rightarrow 2\,\mathrm{HCl}(aq) + \mathrm{O}_2(g)$, whOxidation in modern terms is defined as:The oxidation state of sulphur in SO₄²⁻ is:The oxidation state of manganese in KMnO₄ is:In Cu + 2 AgNO₃ → Cu(NO₃)₂ + 2 Ag, the species oxidised is:A reducing agent is a substance that:Identify the redox reaction:The disproportionation of chlorine in cold dilute NaOH (3 Cl₂ + 6 OH⁻ → 5 Cl⁻ + ClO₃⁻ + 3 H₂O is the hot reactIn an electrochemical (galvanic) cell, oxidation occurs at the:Balance the skeleton equation MnO₄⁻ + Fe²⁺ + H⁺ → Mn²⁺ + Fe³⁺ + H₂O. The coefficient of MnO₄⁻ is:Standard hydrogen electrode (SHE) is assigned electrode potential:An element shows the SAME oxidation number in all its compounds. Which is it?In the half-reaction 2 H₂O → O₂ + 4 H⁺ + 4 e⁻, water acts as:The n-factor of KMnO₄ in acidic medium (Mn⁷⁺ → Mn²⁺) is:Hydrogen peroxide (H₂O₂) can act both as an oxidising agent AND as a reducing agent because:In KO₂ (potassium superoxide), the oxidation state of oxygen is: