Electro Chemistry
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Electro Chemistry
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20 Questions

1. 4.5 g of aluminium (atmass 27 amu) isdeposited at cathode from Al 3+ solution by acertain quantity of electric chargeThe volumeof hydrogen produced at STP from H + ions insolution by the same quantity of electric chargewill be
2. Standard electrode potential for Sn 4+/ Sn2+couple is + 0.15 Vand that for the Cr 3+/ Cr coupleis -“ 0.74 VThese two couples in their standardstate are connected to make a cellThe cellpotential will be:154
3. Ahydrogen gas electrode is made by dippingplatinum wire in a solution of HCl of pH= 10 andby passing hydrogen gas around the platinumwire at one atm pressureThe oxidationpotential of electrode would be?
4. Ahydrogen gas electrode is made by dippingplatinum wire in a solution of HCl of pH= 10 andby passing hydrogen gas around the platinumwire at one atm pressureThe oxidationpotential of electrode would be?
5. In electrolysis of NaCl when Pt electrode istaken then H 2 is liberated at cathode while withHg cathode it forms sodium amalgamThis isbecause
6. Standard electrode potential of three metalsX - Yand Zare -“ 1.2 V - + 0.5 Vand -“ 3.0 V - respectivelyThe reducing power of thesemetals will be:
7. On passing a current of 1.0 ampere for 16 minand 5 sec through one litre solution of CuCl 2 - allcopper of the solution was deposited at cathode.The strength of CuCl 2 solution was (Molar massof Cu= 63.5 Faraday constant = 96 - 500 Cmol -“1)
8. Specific conductance of a 0.1 NKCl solutionat 23ºC is 0.012 ohm -“1 cm-“1Resistance of cellcontaining the solution at same temperaturewas found to be 55 ohmThe cell constant is
9. In the silver plating of copper - K[Ag(CN) 2] isused instead of AgNO3The reason is
10. Which of the following is an insulator?
11. The ionic conductance of Ba 2+ and Cl-“ arerespectively 127 and 76 ohm -“1 cm2 at infinitedilutionThe equivalent conductance (in ohm -“1cm2) of BaCl2 at infinite dilution will be:
12. Equivalent conductances of NaCl - HCl andCH3COONa at infinite dilution are 126.45 - 426.16and 91 ohm-“1 cm2 respectivelyThe equivalentconductance of CH 3COOH at infinite dilutionwould be
13. The most durable metal plating on iron toprotect against corrosion is
14. How many grams of cobalt metal will bedeposited when a solution of cobalt (II) chlorideis electrolyzed with a current of 10 amperes for109 minutes (1 Faraday = 96 - 500 C Atomicmass of Co = 59 u)
15. If 0.01 Msolution of an electrolyte has aresistance of 40 ohms in a cell having a cellconstant of 0.4 cm -“1 - then its molar conductancein ohm -“1 cm2 mol-“1 is
16. On electrolysis of dilute sulphuric acid usingplatinum electrodes - the product obtained at theanode will be
17. How many grams of cobalt metal will bedeposited when a solution of cobalt (II) chlorideis electrolyzed with a current of 10 amperes for109 minutes (1 Faraday = 96 - 500 C Atomicmass of Co = 59 u)
18. If 0.01 Msolution of an electrolyte has aresistance of 40 ohms in a cell having a cellconstant of 0.4 cm -“1 - then its molar conductancein ohm -“1 cm2 mol-“1 is
19. In the silver plating of copper - K[Ag(CN) 2] isused instead of AgNO3The reason is
20. In electrolysis of NaCl when Pt electrode istaken then H 2 is liberated at cathode while withHg cathode it forms sodium amalgamThis isbecause

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