Tiêu đề Redox Reaction, Types of Redox Reaction.pdf ✅

(1.) In the neutral of faintly alkaline medium, KMnO4 oxidises iodide into iodate. The change in oxidation state of manganese in this reaction is from (a.) +6 to +5 (b.) +7 to +4 (c.) +6 to +4 (d.) +7 to +3 NEET-17.07.2022 (2.) Which one of the following is an example of disproportionation reaction? (a.) 2 4 4 2 2 3MnO 4H 2MnO MnO 2H O − + − + → + + (b.) MnO 4H 4e MnO 2H O 4 2 2 − + − + + → + (c.) 2 4 2 2 10I 2MnO 16H 2Mn 8H O 5I − − + + + + → + + (d.) 2 4 2 3 2 2 8MnO 3 S O H O 8MnO − − + + → 2 4 6SO 2OH − − + + JEE Main-26.06.2022, Shift- II (3.) The reaction, 3ClO aq ClO aq 2Cl aq ( ) 3 ( ) ( ) − − − → + is an example of (a.) oxidation reaction (b.) reduction reaction (c.) disproportionation reaction (d.) decomposition reaction Karnataka CET-2017 CG PET- 2013, SCRA - 2009 (4.) In the following reaction 2 2 3 2 3 3 3Br 6CO 3H O 5Br BrO 6HCO − − − − + + → + + (a.) Bromine is reduce and carbonate isoxidised (b.) Bromine is oxidized and carbonate is reduce (c.) Bromine is neither oxidized nor reduced (d.) Bromine is reduced andoxidized Assam CEE-2021 BITSAT-2005 (5.) Which of the following involves transfer of five electrons? (a.) 2 MnO Mn 4 − + → (b.) 2 3 CrO Cr 4 − + → (c.) MnO MnO 4 2 − → (d.) 2 3 Cr O 2Cr 2 7 − + → JEE Main-25.07.2021, Shift-II (AIIMS-2014) (6.) Which of the following changes does not involve any electron transfer? (a.) Na Na → + (b.) 2 Zn Zn + →
(c.) 2 2 Cr O Cr O 2 7 2 4 − − → (d.) 2 VO V O2 3 + → Assam CEE-2021, 2018 (7.) In which of the following reactions, H O2 2 acts as a reducing reagent? (a.) PbO2 (s) +H O2 2 (aq) → PbO (s) + + H O O 2 2 (l) (g) (b.) Na SO2 3 (aq) +H O2 2 (aq) → Na SO2 4 (aq) +H O2 (l) (c.) 2KI (aq) +H O2 2 (aq) → 2KOH (aq) 2 +I (s) (d.) KNO2 (aq) +H O2 2 (aq) → KNO3 (aq) +H O( 2 l) AP EAMCET- 2001, 2000 (8.) Which quantities are conserved in all oxidation-reduction reaction? (a.) Charge only (b.) Mass only (c.) Both charge and mass (d.) Neither charge nor mass COMEDK-2016 UPTU/UPSEE-2009 (9.) In an oxidation reduction reaction, dichromate ( ) 2 Cr O2 7 ion is reduced to 3 Cr + ion. The equivalent weight of K Cr O 2 2 7 in this reaction is (a.) molecular weight 3 (b.) molecular weight 6 (c.) molecular weight 1 (d.) molecular weight 2 UP CPMT-2008 AP-EAMCET (Medical)-2007 (10.) Which of the following is a redox reaction? (a.) Evaporation of H O2 (b.) Both oxidation and reduction (c.) H SO 2 4 with NaOH (d.) In atmosphere O3 from O2 by lightening AIIMS-2013, NEET-1997 (11.) KMnO4 acts as an oxidising agent in alkaline medium. When alkaline KMnO4 is treated with KI, iodide ion is oxidised to (a.) 2 I (b.) IO− (c.) 3 IO−
(d.) 4 IO− Karnataka-CET-2018 Assam CEE-2018 (12.) Identify disproportionation reaction. (a.) CH 2O CO 2H O 4 2 2 2 + → + (b.) CH 4Cl CCl 4HCl 4 2 4 + → + (c.) 2 2 2 2 F 2OH 2 F OF H O − − + → + + (d.) 2 2 3 2 2NO 2OH NO NO H O − − − + → + + JIPMER-2018 JCECE - 2015 (13.) In basic medium, H O2 2 exhibits which of the following reactions? A. Mn Mn 2 4 + + → B. 2 I I → − C. PbS PbSO → 4 Choose the most appropriate answer from the options given below. (a.) A and C (b.) Only A (c.) Only B (d.) A and B [JEE Main 2021, 18 March Shift-II] (14.) To oxidize 1 mole sulphite ion in acid medium, tell the required molar amount of KMnO4 (a.) 1/ 5 (b.) 2 / 5 (c.) 3 / 5 (d.) 4 / 5 Tripura JEE-2021 (15.) Observe the following redox reaction: 3 3 2 2 2 NaNO aZn bNaOH NH cNa ZnO H O + + → + + Which one will be the correct value of ab, and c among the following? (a.) 2,4,2 (b.) 3,8,3 (c.) 1,3,1 (d.) 4,7,4 Tripura JEE-2021 (16.) Given below are two statements. Statement I : Potassium permanganate on heating at 573 K forms potassium manganete. Statement II : Both potassium permanganate and potassium manganate are tetrahedral and paramagnetic in nature. In the light of the above statements, choose the most appropriate answer from the options given below
(a.) Statement I is true but statement II is false. (b.) Both statement I and statement II are true. (c.) Statement I is false but statement II is true. (d.) Both statement I and statement II are false. [JEE Main 2021, 17 March Shift-I] (17.) Which of the following equations depicts the oxidizing nature of H O2 2 ? (a.) Cl H O 2HCl O 2 2 2 2 + → + (b.) KIO H O KIO H O O 4 2 2 3 2 2 + → + + (c.) 2 2 2 2 2I H O 2H I 2H O − + + + → + (d.) 2 2 2 2 I H O 2OH 2I 2H2O O − − + + → + + JEE Main 25-02-2021, Shift-I (18.) Which of the following is not a disproportionation reaction? (a.) Cl2 (g) 2OH− + (aq) ClO → − (aq) Cl− + (aq) +H O2 (b.) F g 2OH aq OF g 2 F 2 2 ( ) ( ) ( ) − − + → + (aq) +H O l 2 ( ) (c.) 3 4ClO− (aq) Cl → − (aq) 4 3ClO− + (aq) (d.) 4ClO− (aq) 2Cl → − (aq) ClO3 − + (aq) TS-EAMCET (Engg.), 06.08.2021 (19.) Given below are two statements: Statement I: H O2 2 can act as both oxidizing and reducing agent in basic medium. Statement II: In the hydrogen economy, the energy is transmitted in the form of dihydrogen. In the light of the above statements, choose the correct answer from the options given below: (a.) Both statement I and statement II are true (b.) Both statement I and statement II are false (c.) Statement I is true but statement II is false (d.) Statement I is false but statement II is true JEE Main 16.03.2021, Shift-I (20.) (A) HOCl H O H O Cl O 2 2 3 2 + − + → + + (B) 2 2 2 2 2 I H O 2OH 2I 2H O O − − + + → + + Chose the correct option. (a.) H O2 2 acts as oxidising agent in equations (A) and (B). (b.) H O2 2 acts as reducing agent in equations (A) and (B). (c.) H O2 2 acts as oxidizing and reducing agent respectively in equations ( A) and (B) . (d.) H O2 2 acts as reducing and oxidising agent respectively in equation ( A) and (B) . JEE Main 24.02.2021, Shift-I (21.) Which among the following species doesn't show disproportionation reaction? (a.) ClO−