Electrochemistry PYQs Set 6 (PDF)

Set 6 of 10 · Questions 151-180 of 293

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Mere Teacher · Previous Year Questions NEET Chemistry · Electrochemistry · Set 6 (Q151-180)
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151. $In two separate experiments, the same quantity of electricity was passed through silver and gold solutions [Assume 't' constant] The amounts of Ag and Au deposited are 2.15 and 1.31 g, respectively. The valency of gold is [Atomic mass of Ag = 107.9; Au = 197]$ (1) $1$ (2) $2$ (3) $3$ (4) $4$ 152. $On electrolysis of dil sulphuric acid using Platinum (Pt) electrode, the product obtained at anode will be$ (1) $Oxygen gas$ (2) $H_{2} S gas$ (3) $SO_{2} gas$ (4) $Hydrogen gas$ 153. $Given: E_{C r^{3 +} / Cr}^{0} = - 0.72, E_{F e^{2 +} / Fe}^{0} = - 0.42 V The potential for the cell Cr \| Cr^{3 +} (0.1 M) \|\| Fe^{2 +} (0.01 M) \| Fe at 298 K is: (Take \frac{2.303 R ( 298 )}{F} = 0.06)$ (1) $0.339 V$ (2) $- 0.339 V$ (3) $- 0.26 V$ (4) $0.26 V$ 154. $The conductivity of a solution of concentration 0.1 mol L^{- 1} of a weak monobasic acid (HA) (in Scm^{- 1}) is (Given Λ_{HA}^{\circ} = 400 Scm^{2} mol^{- 1} and degree dissociation (α) of HA = 0.02)$ (1) $32 \times 10^{- 4}$ (2) $16 \times 10^{- 4}$ (3) $4 \times 10^{- 4}$ (4) $8 \times 10^{- 4}$ 155. $The conductivity of a solution containing 2.08 g of anhydrous barium chloride in 200 mL solution is 6 \times 10^{- 3} ohm^{- 1} cm^{- 1} . The molar conductivity of the solution (in ohm^{- 1} cm^{2} mol^{- 1}) is x \times 10^{2} . The value of x is (Atomic mass of Ba = 137, Cl = 35.5)$ (1) $1.2$ (2) $2.4$ (3) $3.6$ (4) $3.0$ 156. $The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270 kg of aluminium metal from bauxite by the Hall process is$ (1) $270 kg$ (2) $540 kg$ (3) $90 kg$ (4) $180 kg (Atomic mass: Al = 27)$ 157. $The number of electrons delivered at the cathode during electrolysis by a current of 1 ampere in 60 seconds is (charge on electron = 1.60 \times 1 0^{- 19} C)$ (1) $6 \times 1 0^{23}$ (2) $6 \times 1 0^{20}$ (3) $3.75 \times 1 0^{20}$ (4) $7.48 \times 1 0^{23}$ 158. $Given below are two statementsAssertion (A): Conductivity of an electrolyte decreases on dilutionReason (R): On dilution number of ions per unit volume increasesThe correct answer is$ (1) $Both (A) and (R) are correct and (R) is the correct explanation of (A)$ (2) $Both (A) and (R) are correct and (R) is not the correct explanation of (A)$ (3) $(A) is correct but (R) is not correct$ (4) $(A) is not correct but (R) is correct$ 159. $The quantity of silver deposited when one coulomb charge is passed through AgNO_{3} solution :$ (1) $1 g of silver$ (2) $1 electrochemical equivalent of silver$ (3) $1 chemical equivalent of silver$ (4) $0.1 g atom of silver$ 160. $Consider the single electrode process 4 H^{+} + 4 e^{-} ⇌ 2 H_{2} catalysed the platinum black electrode in HCl electrolyte. The potential of the electrode is - 0.059 V . SHE. What is the concentration of the acid in the hydrogen half cell if the H_{2} pressure is 1 bar? 4 H^{+} + 4 e^{-} ⇌ 2 H_{2}$ (1) $1 M$ (2) $10 M$ (3) $0.1 M$ (4) $0.01 M$ 161. $Λ º_{m} for NaCl, HCl and NaA are 126.4, 425.9 and 100.5 S c m^{2} m o l^{-1}, respectively. If the conductivity of 0.001 M HA is 5 \times 1 0^{-5} S c m^{-1}, degree of dissociation of HA is:$ (1) $0.125$ (2) $0.50$ (3) $0.75$ (4) $0.25$ 162. $Which of the following ions does not liberate hydrogen gas on reaction with dilute acids?$ (1) $M n^{2 +}$ (2) $T i^{2 +}$ (3) $V^{2 +}$ (4) $C r^{2 +}$ 163. $H_{2 (g)} + 2 AgCl_{(s)} ⇌ 2 Ag_{(s)} + 2 HCl_{(aq)} E_{cell}^{\circ} at 25^{\circ} C for the cell is 0.22 V . The equilibrium constant at 25^{\circ} C is$ (1) $2.8 \times 10^{7}$ (2) $5.2 \times 10^{8}$ (3) $2.8 \times 10^{5}$ (4) $5.2 \times 10^{4}$ 164. $During the electrolysis of molten sodium chloride, the time required to produce 0.10 mol of chlorine gas using a current of 3 amperes is$ (1) $55 minutes$ (2) $110 minutes$ (3) $220 minutes$ (4) $330 minutes.$ 165. $At 300 K, the conductivity of 0.01 mol dm^{- 3} aqueous solution of acetic acid is 19.5 \times 10^{- 5} mho cm^{- 1} and limiting molar conductivity of acetic acid at the same temperature is 390 mho cm^{2} mol^{- 1} . The degree dissociation of acetic acid is$ (1) $5.0 \times 10^{- 5}$ (2) $5.0 \times 10^{- 2}$ (3) $2.5 \times 10^{- 5}$ (4) $7.5 \times 10^{- 2}$ 166. $At a particular temperature, the ratio of molar conductance to specific conductance of 0.01 M NaCl solution is$ (1) $10^{5} cm^{3} mol^{- 1}$ (2) $10^{3} cm^{3} mol^{- 1}$ (3) $10 cm^{3} mol^{- 1}$ (4) $10^{5} cm^{2} mol^{- 1}$ 167. $The emf of a galvanic cell constituted with the electrodes Zn^{2 +} ∣ Zn (- 0.76 V) and Fe^{2 +} ∣ Fe (- 0.41 V) is$ (1) $- 0.35 V$ (2) $+ 1.17 V$ (3) $+ 0.35 V$ (4) $- 1.17 V$ 168. $Consider the following standard electrode potentials (Eº in volts) in aqueous solution: Element M^{3 +} / M M^{+} / M Al -1.66 + 0.55 Tl +1.26 - 0.34 Based on these data, which of the following statements is correct?$ (1) $A l^{+} is more stable than A l^{3 +}$ (2) $T l^{3 +} is more stable than A l^{3 +}$ (3) $T l^{+} is more stable than A l^{3 +}$ (4) $T l^{+} is more stable than A l^{+}$ 169. $For the given cell; Cu (s) (C u^{2 +} (C_{1} M)) (C u^{2 +} (C_{2} M)) Cu (s) change in Gibbs energy (∆ G) is negative, if$ (1) $C_{2} = 2 C_{1}$ (2) $C_{2} = \frac{C _{1}}{2}$ (3) $C_{1} = 2 C_{2}$ (4) $C_{1} = C_{2}$ 170. $When 0.1 mol M n O_{4}^{2 -} is oxidised the quantity of electricity required to completely oxidise M n O_{4}^{2 -} to M n O_{4}^{-} is$ (1) $96500 C$ (2) $2 \times 96500 C$ (3) $9650 C$ (4) $96.50 C$ 171. $Molar conductivities at infinite dilution \land^{\circ} m for Ba (OH)_{2} BaCl_{2} and NH_{4} Cl are 457.0, 240.6 and 2130 Scm^{2} mol^{- 1} respectively. The \land_{m}^{\circ} for ammonium hydroxide (in Scm^{2} mol^{- 1}) is$ (1) $1683.2$ (2) $1080.2$ (3) $2130.0$ (4) $2238.2$ 172. $Identify the factor from the following that does not affect electrolytic conductance of a solution.$ (1) $The nature of the electrolyte added.$ (2) $The nature of the electrode used.$ (3) $Concentration of the electrolyte.$ (4) $The nature of solvent used.$ 173. $Standard electrode potentials for a few half cells are mentioned below:. E_{Cu^{2 +} / Cu}^{\circ} = 0.34 V, E_{Zn^{2 +} / Zn}^{\circ} = - 0.76 V E_{Ag^{+} / Ag}^{\circ} = 0.80 V, E_{Mg^{2 +} / Mg}^{\circ} = - 2.37 V Which one of the following cells gives the most negative value of Δ G^{\circ} ?$ (1) $Zn (Zn^{2 +} (1 M)) (Ag^{+} (1 M)) Ag$ (2) $Zn (Zn^{2 +} (1 M)) (Mg^{2 +} (1 M)) Mg$ (3) $Ag (Ag^{+} (1 M)) (Mg^{2 +} (1 M)) Mg$ (4) $Cu (Cu^{2 +} (1 M) ‖ Ag^{+} (1 M)) Ag$ 174. $The standard electrode potential of M^{+} /M in aqueous solution does not depend on$ (1) $Hydration of a gaseous metal ion$ (2) $Sublimation of a solid metal$ (3) $Ionisation of a solid metal atom$ (4) $Ionisation of a gaseous metal atom$ 175. $In dry cell, what acts as negative electrode?$ (1) $Zinc$ (2) $Graphite$ (3) $Ammonium chloride$ (4) $Manganese dioxide$ 176. $Aluminium oxide may be electrolysed at 1000ºC to furnish aluminium metal (At.Mass of Al = 27 amu ; 1 Faraday = 96,500 Coulombs). The cathode reaction is A l^{3 +} + 3 e^{-} ® A l^{0} . To prepare 5.12 kg of aluminium metal by this method, one would require:$ (1) $5.49 \times 1 0^{7} C of electricity$ (2) $1.83 \times 1 0^{7} C of electricity$ (3) $5.49 \times 1 0^{4} C of electricity$ (4) $5.49 \times 1 0^{10} C of electricity$ 177. $On electrolysis of dilute sulphuric acid using platinum electrodes, the product obtained at the anode will be$ (1) $hydrogen$ (2) $oxygen$ (3) $hydrogen sulphide$ (4) $sulphur dioxide.$ 178. $If ' A' is the reactant and ' P' is the product, which one of the following is the correct form of Nernst equation?$ (1) $\frac{[ A ]}{[ P ]} = exp (\frac{RT}{n F} (E - E^{\circ}))$ (2) $\frac{[ A ]}{[ P ]} = exp (\frac{n F}{RT} (E - E^{\circ}))$ (3) $\frac{[ A ]}{[ P ]} = exp (- \frac{n F}{RT} (E - E^{\circ}))$ (4) $E = E^{\circ} - \frac{RT}{nF} ln \frac{[ A ]}{[ P ]}$ 179. $For the following cell, Zn(s) \| Z n S O_{4} (aq) \|\| C u S O_{4} (aq) \| Cu(s) when the concentration of Z n^{2 +} is 10 times the concentration of C u^{2 +}, the expression for DG (in J m o l^{-1}) is [F is Faraday constant; R is gas constant; T is temperature; Eº(cell) = 1.1 V]$ (1) $2.303 RT + 1.1 F$ (2) $1.1 F$ (3) $2.303 RT - 2.2 F$ (4) $-2.2 F$ 180. $How is electrical conductance of a conductor related with length and area of cross section of the conductor?$ (1) $G = l \cdot a \cdot κ^{- 1}$ (2) $G = κ \cdot a \cdot l^{- 1}$ (3) $G = κ \cdot l \cdot a^{- 1}$ (4) $G = κ \cdot l \cdot a^{- 2}$