ECAT Chemistry Chapter 10 Electrochemistry With Answers

ECAT Chemistry Chapter 10 Electrochemistry

Sr. # Questions Answers Choice
1 Reaction takes place at anode is Ionization Reduction Oxidation Hydrolysis
2 2.5 faradays of electricity is passed through solution of CuSO4. The number of gram equivalents of copper deposited on the cathode would be 1 2 2.5 1.25
3 In a solution of CuSO4how much time will be required to precipitate 2g copper by 0.5 ampere current? 12157.48 sec 102 sec 510 sec 642 sec
4 Which of the following is the use of electrolysis? Eletrorefining Electroplating Both A and B None of the above
5 96500 C of electricity liberates from CuSO4solution 63.5 g of Cu 31.75 g of Cu 96500 g of Cu 100 g of Cu
6 Pure water does not conduct electricity because it Has low boiling point Is almost unionized Is neutral Is readily decomposed
7 Which of the following is a strong electrolyte? Ca(NO<sub>3</sub>)<sub>2</sub> HCN CH<sub>3</sub>COOH NH<sub>4</sub>OH
8 When electricity is passed through molten electrolyte consisting of alumina and cryolite, 13.5 g of Al are deposited. The number of faradays of electricity passed must be 2.0 1.5 1.0 0.5
9 In a Galvanic cell Chemical energy is converted into electricity Chemical energy is converted into heat Electrical energy is converted into heat Electrical energy is converted into chemical energy
10 The amount of electricity that can deposit 108 g of silver from silver nitrate solution is 1 ampere 1 coulomb 1 faraday 2 ampere
11 The conductivity of strong electrolyte Increases on dilution slightly Does not change on dilution Decreases on dilution Depends on density of electrolyte it self
12 Out of Cu, Ag, Fe and Zn the metal which can displace all others from theri salt solution is Ag Cu Zn Fe
13 A certain current liberate 0.5 g of hydrogen in 2 h. How many grams of copper can be liberated by the same time in a copper sulphate solution? 12.7 gm 15.9 gm 31.8 gm 63.5 gm
14 A current of 9.65 ampere flowing for 10 minutes deposits 3.0 g of the metal which is monovalent. The atomic mass of the metal is 10 50 30 96.5
15 A solution of sodium sulphate was electrolysed using some insert electrodes. The products at the electrodes are O<sub>2</sub>, H<sub>2</sub> O<sub>2</sub>, Na O<sub>2</sub>, SO<sub>2</sub> O<sub>2</sub>, S<sub>2</sub>O<sub>8</sub><sup>2</sup>
16 A cell constant is generally found by measuring the conductivity of aqueous solution of BaCl<sub>2</sub> KCl NaCl MgCl<sub>2</sub>
17 An electrolyte Forms complex ions solution Gives ions only when electricity is passed Possesses ions even in solid state Gives ions only when dissolved in water
18 When electrically is passed through molten Al2O3+ Na3AlF6and 13.5 gms of Al are deposited, the number of farady must be 0.5 1.0 1.5 2.0
19 The reference calomel electrode is made from which of the following? ZnCl<sub>2</sub> CuSO<sub>4</sub> Hg<sub>2</sub>Cl<sub>2</sub> HgCl<sub>2</sub>
20 If a salt bridge is removed between the two half cells, the voltage Drops to zero Does not change Increases gradually Increases rapidly
21 When quantity of electricity passed is one faraday then the mass deposited at the electrode is equal to One gm, atomic weight One gm, Equivalent Eletrochemical equivalent None of the above
22 Which of the substances Na, Hg, S Pt and graphite can be used as electrodes in electrolytic cells having aqueous solution? Na, Pt and graphite Na and Hg Pt and graphite only Na and S only
23 When fused PbBr2is electrolyed then Bromine appears at cathode Lead deposited at the cathode Lead appears at the anode None of these happens
24 An electrochemical cell is based upon Acid-base reaction Redox reaction Nuclear reaction None of the above
25 Sodium metal is obtained by the electrolysis of fused NaCl in cell is called Nelson's cell Down's cell Daniell cell Voltaic cell
26 -1.10 V +1.10 V -0.42 V +0.42 V
27 Iodine can oxidise iron Bromine can oxidise iron Iodine can oxidise bromine Iron can oxidise bromine
28 A strong reducing agent A strong oxidising agent Better oxidising agent than hydrogen Less reducing agent than hydrogen
29 A standard hydrogen electrode (S.H.E) consists of a platinized platinum electrode dipped in 1 molar solution of H+ions and hydrogen gas is passed at a pressure of One pascal One kilo pascal One atmoshpere Then atmoshpere
30 Adding H<sub>2</sub>O and H<sup>+</sup>ions Adding OH<sup>-</sup>ions Adding O<sup>2</sup>molecules Adding O atoms
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