ECAT Chemistry Chapter 10 Electrochemistry Online Test With Answers

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ECAT Chemistry Chapter 10 Electrochemistry Online Test

Sr. # Questions Answers Choice
1 In a Galvanic cell, the electrons flow from A node to cathode through the solution Cathode to anode through the external circuit Cathode to anode through the external circuit Anode to cathode through the external circuit
2 Specific conductivity of a solution Increases with dilution Decreases with dilution Remains unchanged with dilution Depends on mass of electrolyte
3 For spontaneity of a cell, which is correct? <span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);"><b>Δ</b></span>G = 0,<b style="text-align: center;">Δ</b>E = 0 <b style="text-align: center;">Δ</b>G = -ve ,<b style="text-align: center;">Δ</b>E = 0 <b style="text-align: center;">Δ</b>G = +ve ,<b style="text-align: center;">Δ</b>E = 0 <b style="text-align: center;">Δ</b>G = -ve
4 The standard e.m.f. of a galvanic cell involving cell reaction with n = 2 is found to be 0.2965 V at 25°C. The equilibrium constant of the reaction would be 1.0 x 10<sup>10</sup> 2.0 x 10<sup>11</sup> 4.0 x 10<sup>12</sup> 1.0 x 10<sup>2</sup>
5 An electric current is passed through silver nitrate solution using silver electrodes.10.79 g of silver was found to be deposited on the cathode if the same amount of electricity is passed through copper sulphate solution using copper electrodes, the weight of copper deposited on the cathode is 6.4 g 2.3 g 128.8 g 3.2 g
6 An electric current is passed through silver voltameter connected to a water voltmeter. The cathode of the silver voltameter is 0.108 g more at the end of the electrolysis. The volume of oxygen evolved at STP is 56 cm<sup>3</sup> 550 cm<sup>3</sup> 5.6 cm<sup>3</sup> 11.2 cm<sup>3</sup>
7 If the standard electrode potential of CU2+/Cu electrode is 0.34 V, what is the electrode potential of 0.01 M concentration of Cu2+? (T=298) 0.399 V 0.281 V 0.222 V 0.176 V
8 Which of the following (1 M) conducts more electricity? Sulphuric acid Boric acid Nitric acid Phosphorus acid
9 Time required to deposit one millimole of aluminium metal by the passage of 9.65 amperes through molten electrolyte containing aluminium ion is 30 s 10 s 30,000 s 10,000 s
10 Same amount of electric current is passed through solutions of AgNO3and HCl. If 1.08 g of silver is obtained in the first case, the amount of hydrogen liberated as S.T.P in the second case is 112 cm<sup>3</sup> 22400 cm<sup>3</sup> 224 cm<sup>3</sup> 1.008 g
11 Standard reduction electrode potential of three metals A, B and C are erespectively + 0.05 V, -3.0 and -1.2V. The reducting power of B &gt; C &gt; A A &gt; B &gt; C C &gt; B &gt; A A &gt; C &gt; B
12 When during electrolysis of a solution of AgNO3, 9650 coulombs of charge pass through the electroplating bath, the mass of silver deposited on the cathode will be 1.08 g 10.8 g 21.6 g 108 g
13 The unit of specific conductivity is Ohm cm<sup>-1</sup> Ohm cm<sup>-2</sup> Ohm<sup>-1</sup>cm Ohm<sup>-1</sup>cm<sup>-1</sup>
14 Corrosion is basically a Altered reaction in presence of H<sub>2</sub>O Electrochemical phenomenon Interaction Union between two light metals and a heavy metal
15 In electrolysis of NaCl when Pt electrode is taken then H2is liberated at cathode while with Hg cathode it forms sodium amalgam Hg is more inert than Pt More voltage is required to deduce H<sup>+</sup>at Hg than Pt Na is dissolved in Hg while it does not dissolve in Pt Conc. of H<sup>+</sup>ions is larger when Pt electrode is taken
16 A smuggler could not carry gold by chemically depositing iron on the gold surface since Gold is denser Iron rusts Gold has higher reduction potential then iron Gold has lower reduction potential then iron
17 The reference electrode is made by using ZnCl<sub>2</sub> CuSO<sub>4</sub> HgCl<sub>2</sub> Hg<sub>2</sub>Cl<sub>2</sub>
18 The standard EMF of Daniel cell is 1.10 volt. The maximum electrical work obtained from the Daniel cell is 212.3 kJ 175.4 kJ 106.15 kJ 53.07 kJ
19 The equivalent conductivity of 0.1 M week acid is 100 times less than at infinite dilution. The degree of dissociation is 100 10 0.01 0.001
20 Calculate the amount of charge flowing in 2 minute in a wire of resistance 10Ωwhen a potential difference of 20 V is applied 120 C 240 C 20 C 4 C
21 The specific conductance of 0.1 M NaCl solution is 1.06 x 10-2ohm-1mol-1. Its molar conductance in ohm-1cm2mol-1is 1.06 x 10<sup>2</sup> 1.06 x 10<sup>3</sup> 1.06 x 10<sup>4</sup> 53
22 Best way to prevent rusting of iron is by Making iron cathode Putting it in saline water Both of these None of these
23 The substance having highest conductivity at room temperature among the following is 0.1 N HCl 0.1 N NaCl<br> Graphite Glass
24 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>
25 Prevention of corrosion of iron by Zn coating is called Galvanization Cathodic protection Electrolysis Photoelectrolysis
26 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
27 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
28 The number of coulombs required for the deposition of 107.870 g of silver is 96500 48250 193000 10000
29 The art of electroplating was given by Faraday Edison Thomas Gradam Brugan
30 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
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