ECAT Chemistry Online Test With Answers

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ECAT Chemistry Online Test

Sr. # Questions Answers Choice
1 The substance having highest conductivity at room temperature among the following is 0.1 N HCl 0.1 N NaCl<br> Graphite Glass
2 The specific conductance of a 0.1 N KCl solution at 23°C is 0.012 ohm-1cm-1. The resistance of cell containing the solution at the same temperature was found to be 55 ohm. The cell constant will be 0.142 cm<sup>-1</sup> 0.66 cm<sup>-1</sup> 0.916 cm<sup>-1</sup> 1.12 cm<sup>-1</sup>
3 Prevention of corrosion of iron by Zn coating is called Galvanization Cathodic protection Electrolysis Photoelectrolysis
4 Pick out the wrong statement. In electrochemical cell Electrons are released at anode Cathode is regarded as negative electrode Chemical energy is converted into electrical energy Salt bridge maintains the electrical neutrality of the solution
5 What will be the weight of deposited silver on passing 965 coulombs of electricity in solution of AgNO3? 1.08 g 2.16 g 0.54 g 0.27 g
6 The number of coulombs required for the deposition of 107.870 g of silver is 96500 48250 193000 10000
7 The art of electroplating was given by Faraday Edison Thomas Gradam Brugan
8 96500 C electricity is passed through CuSO4. The amount of copper precipitated is 0.25 mole 0.5 mole 1.0 mole 2.00 mole
9 Reaction takes place at anode is Ionization Reduction Oxidation Hydrolysis
10 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
11 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
12 Which of the following is the use of electrolysis? Eletrorefining Electroplating Both A and B None of the above
13 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
14 Pure water does not conduct electricity because it Has low boiling point Is almost unionized Is neutral Is readily decomposed
15 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
16 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
17 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
18 The amount of electricity that can deposit 108 g of silver from silver nitrate solution is 1 ampere 1 coulomb 1 faraday 2 ampere
19 The conductivity of strong electrolyte Increases on dilution slightly Does not change on dilution Decreases on dilution Depends on density of electrolyte it self
20 Out of Cu, Ag, Fe and Zn the metal which can displace all others from theri salt solution is Ag Cu Zn Fe
21 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
22 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
23 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>
24 A cell constant is generally found by measuring the conductivity of aqueous solution of BaCl<sub>2</sub> KCl NaCl MgCl<sub>2</sub>
25 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
26 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
27 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>
28 If a salt bridge is removed between the two half cells, the voltage Drops to zero Does not change Increases gradually Increases rapidly
29 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
30 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
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