Title 08. REDOX REACTIONS.pdf ✅

(1.) In the reaction 2 2 2 2H S SO 3S 2H O + → + [Page: 264] (a) H S2 has been oxidized (b) 2 SO has been oxidized (c) H S2 is the oxidizing agent (d) 2 SO is the oxidizing agent (2.) In the reaction MnO 4HCl MnCl Cl 2H O 2 2 2 2 + → + + , which species is oxidized. [Page: 264] (a) HCl is oxidized to Cl2 (b) MnO2 is oxidized to MnCl2 (c) HCl is oxidized to H O2 (d) None of these (3.) Combination of phosphorus and oxygen is an example of [Page: 264] (a) oxidation (b) reduction (c) rancidity (d) None of these (4.) Which of the following is a redox reaction? [AIPMT‐l997, Page: 264] (a) Evaporation of H O2 (b) Both oxidation and reduction (c) H SO 2 4 and NaOH (d) In atmosphere O3 from O2 by lighting (5.) Which of the following is not an example of redox reaction [NCERT Exemplar Modified, Page: 264] (a) 2 2PbO C 2Pb CO + → + (b) 2 3 2 Fe O 3CO 2Fe 3CO + → + (c) 2 2K F 2KF + → (d) AgNO NaCl AgCl NaNO 3 3 + → + (6.) Match the columns: [Page: 264] Column I Column II (a) Addition of oxygen (i) Oxidation reaction
(b) Removal of electropositive element reaction (ii) Reduction (c) Removal of hydrogen (d) Addition of electronegative element (a) A → (i), B → (ii), C → (ii), D → (i) (b) A → (ii), B → (i), C → (i), D → (ii) (c) A → (i), B → (i), C‐  (ii), D → (ii) (d) A → (ii), B → (ii), C → (i), D → (i) (7.) Match the columns: [Page: 264] Column I Column II (a) ( ) ( ) 2 2Mg s O g + → 2MgO(s) (i) removal of hydrogen (b) ( ) ( ) ( ) ( ) 2 2 2 2H S g O g 2S s 2H O I + → + (ii) addition of oxygen (c) ( ) ( ) ( ) ( ) 3 2 2 2FeCl aq H g 2PeCl aq 2HCl aq + → + (iii) addition of electropositive element (d) ( ) ( ) ( ) ( ) 2 2 2 2 4 2HgCl aq SnCl aq Hg Cl s SnCl aq + → + (iv) removal of electronegative element (a) A → (i), B → (ii), C → (iii), D → (iv) (b) A → (ii), B‐ (i), C‐ * (iv), D → (iii) (c) A → (ii), B → (iii), C → (i), D → (iv) (d) A → (iv), B → (iii), C‐ * (ii), D‐  (i) (8.) Consider the following statement: [Page: 264] (A) ( ) ( ) ( ) 3 2 2 2FeCl aq H g 2FeCl aq 2HCl + → + (aq) is a redox reaction. (B) BaCl H SO BaSO 2HCl 2 2 4 4 + → + is not a redox reaction. Select the correct option:
(a) A is true, B is false (b) Both A and B are false (c) A is false, B is true (d) Both A and B are true (9.) Reduction is a gain of [Page: 265] (a) electrons (b) protons (c) neutrons (d) oxygen (10.) Loss of electrons is found in [Page: 265] (a) oxidation (b) reduction (c) redox‐reaction (d) All of the above (11.) Oxidation‐reduction reaction involves [Page: 265] (a) transfer of neutrons (b) transfer of protons (c) transfer of electrons (d) None of the above (12.) If one‐half of an equation shows oxidation and remaining half reflects reduction, then we call them: [Page: 265] (a) half equation (b) oxidation equation (c) reduction equation (d) redox equation (13.) In the reaction Br 2I 2Br I 2 2 − − + → + , the oxidizing agent is [Page: 265] (a) Br2 (b) I − (c) Br − (d) 2 I (14.) Which of the following is/are TRUE regarding oxidation/reduction reactions? [Page: 265] I. Oxidation involves the gain of electrons II. Electrons are transferred from one substance to another III. The number of electrons lost/gained must be equal (a) I only (b) II only (c) III only (d) II and III (15.) Electrons are lost by the [Page: 265]
(a) reducing agent as it undergoes oxidation. (b) reducing agent as it undergoes reduction. (c) oxidizing agent as it undergoes oxidation. (d) oxidizing agent as it undergoes reduction. (16.) Which species is losing electrons in the following redox reaction? [Page: 265] 2 2 2 2 SnO 4Cl 4H SnCl Cl 2H O − + + + → + + (a) H + (b) Cl− (c) O (d) Sn (17.) 17. In the reaction [QR code, Page: 265] 2 2Cu O 2CuO + → which one acts as a reducing agent? (a) Cu (b) O2 (c) Cu and O2 (d) Cu or O2 (18.) When copper turnings are added to silver nitrate solution, a blue‐coloured solution is formed after some time. It is because copper [Page: 266] (a) displaces silver from the solution (b) forms a blue‐coloured complex with AgNO3 (c) is oxidized to 2 Cu + (d) is reduced to 2 Cu + (19.) Which of the following redox reactions correctly represents the reaction occurring in a beaker? [Page: 266] (a) ( ) ( ) ( ) ( ) 2 2 Zn s Cu aq Zn aq Cu s + + + → +