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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. 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?
3. Kohlrausch’s law states that at finite dilution - each ion makes definite contribution to equivalent conductance of an
4. In the silver plating of copper - K[Ag(CN) 2] isused instead of AgNO3The reason is
5. 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
6. If 0.5 amp current is passed through acidifiedsilver nitrate solution for 100 minutesThe massof silver deposited on cathode - is (eq.wt.of silvernitrate = 108)
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. 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)
10. In electrolysis of NaCl when Pt electrode istaken then H 2 is liberated at cathode while withHg cathode it forms sodium amalgamThis isbecause
11. Standard electrode potential of three metalsX - Yand Zare -“ 1.2 V - + 0.5 Vand -“ 3.0 V - respectivelyThe reducing power of thesemetals will be:
12. Without losing its concentration ZnCl 2solution cannot be kept in contact with
13. 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:
14. The most durable metal plating on iron toprotect against corrosion is
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 heating one end of a piece of a metal - theother end becomes hot because of
17. On electrolysis of dilute sulphuric acid usingplatinum electrodes - the product obtained at theanode will be
18. The most convenient method to protect thebottom of ship made of iron is
19. 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
20. Which of the following is an insulator?

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