CBSE Class 11 (Science) Redox Reactions — practice questions
116 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice CBSE Class 11 (Science) Redox Reactions in the app →As per your syllabus, the term OXIDATION (broadened) covers which of the following changes?As per your syllabus, in modern (electron-transfer) terms, OXIDATION is defined as which process?As per your syllabus, an OXIDISING AGENT is best described as which kind of species?As per your syllabus, eqn 7.14, in the reaction 2Na(s) + S(s) → Na₂S(s), which species is OXIDISED?As per your syllabus, in Zn(s) + Cu²⁺(aq) → Zn²⁺(aq) + Cu(s), which acts as the reducing agent?As per your syllabus, the electron-releasing (reducing) tendency among the metals Zn, Cu, Ag is in which orderAs per your syllabus, oxidation can also be characterised as the addition of which kind of element to a substaAs per your syllabus, eqn 7.4, in 2H₂S(g) + O₂(g) → 2S(s) + 2H₂O(l), H₂S is oxidised mainly because of which cAs per your syllabus, a HALF REACTION is best characterised as which kind of equation?As per your syllabus, in 2Na(s) + H₂(g) → 2NaH(s), the role of hydrogen is which?As per your syllabus, when Cu(s) is placed in AgNO₃(aq), the equilibrium of Cu + 2Ag⁺ → Cu²⁺ + 2Ag favours whiAs per your syllabus, when Co(s) is placed in NiSO₄(aq), which describes the position of the resulting equilibAs per your syllabus, the oxidation number of oxygen in a normal PEROXIDE (e.g. H₂O₂, Na₂O₂) is which?As per your syllabus, the oxidation number of oxygen in a SUPEROXIDE (e.g. KO₂, RbO₂) is which?As per your syllabus, the oxidation number of oxygen in OF₂ (oxygen difluoride) is which?As per your syllabus, the oxidation number of hydrogen in a binary metal HYDRIDE (e.g. NaH, LiH, CaH₂) is whicAs per your syllabus, the oxidation number of an atom in any element in its FREE / UNCOMBINED form (e.g. O₂, PAs per your syllabus, rules, the oxidation number of sulphur in H₂SO₄ is which?As per your syllabus, rules, the oxidation number of chromium in K₂Cr₂O₇ is which?As per your syllabus, rules, the oxidation number of Mn in KMnO₄ is which?As per your syllabus, Problem 7.3 (Stock notation), the iron in Fe₂O₃ is best written with which Roman numeralAs per your syllabus, MnO₂ is best written as which formula?As per your syllabus, the highest oxidation state of chlorine in its compounds (e.g. HClO₄) is which?As per your syllabus, the AVERAGE oxidation number of S in S₄O₆²⁻ (tetrathionate) is which?As per your syllabus, a COMBINATION reaction is classified as redox under which condition?As per your syllabus, the decomposition CaCO₃(s) → CaO(s) + CO₂(g) is classified as which kind of reaction?As per your syllabus, the reaction CuSO₄(aq) + Zn(s) → ZnSO₄(aq) + Cu(s) is classified as which type?As per your syllabus, eqn 7.32, the reaction Cr₂O₃(s) + 2 Al(s) → Al₂O₃(s) + 2 Cr(s) is an example of which inAs per your syllabus, the OXIDISING strength among halogens decreases in which order?As per your syllabus, the reaction Cl₂(g) + 2 KI(aq) → 2 KCl(aq) + I₂(s) is an example of which kind?As per your syllabus, eqn 7.45, in 2H₂O₂(aq) → 2H₂O(l) + O₂(g), the oxidation states of O in H₂O₂, O₂, and H₂OAs per your syllabus, eqn 7.48, Cl₂(g) + 2 OH⁻ → ClO⁻ + Cl⁻ + H₂O has Cl in which oxidation states in productsAs per your syllabus, which halogen does NOT undergo disproportionation with alkali (unlike Cl₂, Br₂, I₂)?As per your syllabus, among the chlorine oxoanions ClO⁻, ClO₂⁻, ClO₃⁻, ClO₄⁻, which one does NOT disproportionAs per your syllabus, eqn 7.40, the reaction 2 H₂O + 2 F₂ → 4 HF + O₂ shows which species being oxidised?As per your syllabus, the TWO methods used to balance redox reactions are which?As per your syllabus, the balanced ionic equation for Cr₂O₇²⁻ + SO₃²⁻ → Cr³⁺ + SO₄²⁻ in acid solution uses howAs per your syllabus, the same Cr₂O₇²⁻ + SO₃²⁻ balanced equation produces how many H₂O molecules on the producAs per your syllabus, Step 4 for an ACIDIC medium adds which species?As per your syllabus, eqn 7.54, the balanced reduction half-reaction for Cr₂O₇²⁻ in acidic medium consumes howAs per your syllabus, eqn 7.54, the balanced reduction half-reaction for Cr₂O₇²⁻ in acidic medium gains how maAs per your syllabus, for a BASIC medium, oxygen balance is achieved by adding which species?As per your syllabus, the balanced reaction of MnO₄⁻ with Br⁻ in BASIC medium gives MnO₂ and which Br species?As per your syllabus, OXIDATION in terms of oxidation number means which change?As per your syllabus, in 2Cu₂O(s) + Cu₂S(s) → 6Cu(s) + SO₂(g), which species is REDUCED?As per your syllabus, the reaction N₂(g) + O₂(g) → 2 NO(g) is classified as which type of redox?As per your syllabus, the reaction 2 NO₂(g) + 2 OH⁻ → NO₂⁻ + NO₃⁻ + H₂O is classified as which type?In the modern electron-transfer view, a REDUCING AGENT isThe 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 electronsWhat is the AVERAGE oxidation number of sulphur in the tetrathionate ion $\mathrm{S}_4\mathrm{O}_6^{2-}$?In a redox reaction, oxidation refers to which change?When an atom is reduced, what happens to its oxidation state?In which year did the term redox first appear in print?The oxidation alone and the reduction alone are each called a what?A reducing agent in a redox reaction does what?An oxidizing agent removes electrons from another substance. What happens to the agent itself?The pair Fe2+/Fe3+ is an example of what?Originally, the word oxidation meant which process?The word reduction originally referred to which observation?Which elemental metal is a good reducing agent?NaBH4 and LiAlH4 reduce carbonyl compounds by transferring what?Which standard reduction potential is listed for F2, a very strong oxidizing agent?An oxidizing agent weaker than H+ has what sign of standard reduction potential?How is the standard cell potential obtained from half-cell values?In H2 + F2 giving 2 HF, which species is reduced?What happens to iron atoms when iron rusts?Common rust is usually which compound?What defines a disproportionation reaction?Thiosulfate in acid forms S and SO2. Sulfur goes from +2 to which two states?Cl2 reacts with concentrated NaOH. What is chlorine's oxidation number in chlorate?Which French-derived word is another name for disproportionation?Who studied 2 Sn2+ giving Sn4+ and Sn using tartrates in 1788?Which enzyme catalyses the disproportionation of hydrogen peroxide to water and oxygen?Which enzyme converts superoxide into hydrogen peroxide and oxygen in living systems?The Cannizzaro reaction converts an aldehyde into which pair of products?An atom's oxidation state is its hypothetical charge if every bond were treated as what?In a neutral molecule, the oxidation numbers of all atoms add up to what?What oxidation number does chlorine have in KCl?Which element shows the highest known oxidation state, +9, in IrO4+?In Stock nomenclature, how is the oxidation state written?Who first used the term oxidation for the reaction of a substance with oxygen?What oxidation state does hydrogen take when bonded as a hydride to a metal?In which kind of compound is oxygen not assigned -2?What oxidation state does magnesium have in its compounds?What is the average oxidation state of iron in magnetite, Fe3O4?What is the oxidation state of each oxygen atom in potassium superoxide, KO2?What average oxidation state is assigned to carbon in propane, C3H8?How many integer oxidation states does carbon have between -4 and +4?Acetaldehyde becomes acetic acid with Tollens' reagent. How does the carbonyl carbon change?In 2 As3+ + 3 Sn2+ giving 2 As + 3 Sn4+, how many electrons are transferred?Bond electrons between unlike atoms go to the atom with?How are bond electrons shared between two atoms of the same element when assigning oxidation states?Does an oxidation state represent an atom's actual charge?Formal charge is the opposite idea to oxidation state because it treats bonds as what?In cathodic protection, the protected metal is made which part of a cell?The Ostwald process makes nitric acid by the catalytic oxidation of what?Which reducing agent is combined with iron oxides in a blast furnace?In Fe2O3 + 3 CO giving 2 Fe + 3 CO2, what role does CO play?In aerobic cellular respiration, oxygen is reduced to form what?In photosynthesis, water is oxidized into which product?Which compound is the product when NAD+ is reduced in respiration?What does the mnemonic OIL RIG state?According to the AN OX and RED CAT mnemonics, oxidation occurs at which electrode?In a galvanic cell such as a fuel cell, which electrode is negative?Who won the 1983 Nobel Prize in Chemistry for distinguishing inner-sphere and outer-sphere electron transfer?In inner-sphere electron transfer, the two reactants share what?Hydrogenation of a C=C bond is classified as which type of change?Which of these is named as a strong oxidizer?Heating phosphorous acid to 200 degrees C gives phosphoric acid and which other product?UV light makes mercury(I) chloride disproportionate into HgCl2 and what else?What is red lead, Pb3O4, called in systematic nomenclature?