Redox Reactions PYQs Set 6 (PDF)

Set 6 of 6 · Questions 151-163 of 163

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Redox Reactions · Set 6 (Q151-163)
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151. $Which one of the following is an example of disproportionation reaction?$ (1) $3 M n O_{4}^{2 -} + 4 H^{+} \to 2 M n O_{4}^{-} + M n O_{2} + 2 H_{2} O$ (2) $M n O_{4}^{2 -} + 4 H^{+} + 4 e^{-} \to M n O_{2} + 2 H_{2} O$ (3) $10 I^{-} + 2 M n O_{4}^{-} + 16 H^{+} \to 2 M n^{2 +} + 8 H_{2} O + 5 I_{2}$ (4) $8 M n O_{4}^{-} + 3 S_{2} O_{3}^{2 -} + H_{2} O \to 8 M n O_{2} + 6 S O_{4}^{2 -} + 2 O H^{-}$ 152. $Match List - I with List - II. List - I Reaction (A) N_{2 (g)} + O_{2 (g)} \to 2 NO_{(g)} (B) 2 Pb (NO_{3})_{2 (s)} \to 2 PbO_{(s)} + 4 NO_{2 (g)} + O_{2 (g)} (C) 2 Na_{(s)} + 2 H_{2} O_{(I)} \to 2 NaOH_{(aq .} + H_{2 (g)} (D) 2 NO_{2 (g)} + 2^{-} OH (aq.) \to NO_{2 (aq .)}^{-} + NO_{3 (aq .)}^{-} + H_{2} O_{(l)} List - II Type of redox reaction (I) Decomposition (II) Displacement (III) Disproportionation (IV) Combination Choose the correct answer from the options given below :$ (1) $(A)-(II), (B)-(III), (C)-(IV), (D)-(I)$ (2) $(A)-(III), (B)-(II), (C)-(I), (D)-(IV)$ (3) $(A)-(IV), (B)-(I), (C)-(II), (D)-(III)$ (4) $(A)-(I), (B)-(II), (C)-(III), (D)-(IV)$ 153. $Identify the process in which change in the oxidation state is five :$ (1) $C r_{2} O_{7}^{2 -} \to 2 C r^{3 +}$ (2) $M n O_{4}^{-} \to M n^{2 +}$ (3) $C r O_{4}^{2 -} \to C r^{3 +}$ (4) $C_{2} O_{4}^{2 -} \to 2 C O_{2}$ 154. $What is the oxidation state of S in the sulphur containing proact of the following reaction? SO_{3}^{2 -} (aq) + Br_{2} (l) + H_{2} O \to$ (1) $+6$ (2) $+4$ (3) $+2.5$ (4) $+2$ 155. $In base vs. Acid titration, at the end point methyl orange is present as$ (1) $quinonoid form$ (2) $heterocyclic form$ (3) $phenolic form$ (4) $benzenoid form$ 156. $Oxidation state of Fe in F e_{3} O_{4} is$ (1) $\frac{5}{4}$ (2) $\frac{4}{5}$ (3) $\frac{3}{2}$ (4) $\frac{8}{3}$ 157. $Which of the following reactions is not a disproportionation reaction?$ (1) $CaCO_{3} ⟶ CaO + CO_{2}$ (2) $P_{4} + 3 NaOH + 3 H_{2} O ⟶ 3 NaH_{2} PO_{2} + PH_{3}$ (3) $2 H_{2} O_{2} ⟶ 2 H_{2} O + O_{2}$ (4) $2 Cu^{+} ⟶ Cu^{2 +} + Cu$ 158. $Which of the following are disproportionation reactions?(A) Cl_{2} + 2 NaOH \to NaCl + NaOCl + H_{2} O (B) H_{2} O_{2} \to 2 H_{2} O + O_{2} (C) 2 KMnO_{4} \to K_{2} MnO_{4} + MnO_{2} + O_{2} (D) 3 MnO_{4}^{2 -} + 4 H^{+} \to 2 MnO_{4}^{-} + MnO_{2} + 2 H_{2} O$ (1) $A, B, C only$ (2) $A, B, D only$ (3) $A, C only$ (4) $A, B, C, D$ 159. $In polythionic acid, H_{2} SxO6(x = 3 to 5) the oxidation state(s) of sulphur is/are :$ (1) $+5 only$ (2) $+6 only$ (3) $+3 and +5 only$ (4) $0 and +5 only$ 160. $C u^{2 +} salt reacts with potassium iodide to give$ (1) $C u_{2} I_{2}$ (2) $C u_{2} I_{3}$ (3) $C u I$ (4) $C u (I_{3})_{2}$ 161. $A 2.0 g sample containing M n O_{2} is treated with HC1 liberating C 1_{2} . The C 1_{2} gas is passed into a solution of KI and 60.0 mL of 0.1 M N a_{2} S_{2} O_{3} is required to titrate the liberated iodine. The percentage of M n O_{2} in the sample is__________. (Nearest integer) [Atomic masses (in u) Mn = 55; Cl = 35.5; O = 16, I = 127, Na = 23, K= 39,8 = 32]$ 162. $The number of electrons involved in the reduction of permanganate to manganese dioxide in acidic medium is$ 163. $For the reaction given below: C o C l_{3} . x N H_{3} + A g N O_{3} (aq) \to If two equivalents of AgCl precipitate out, then the value of x will be_____.$