ECAT Chemistry MCQ's Test For Full Book With Answers

ECAT Chemistry MCQ's Test For Full Book

Sr. # Questions Answers Choice
1 Lead accumulator contains 30% NaCI solution as electrolyte 30% HCI solution as electrolyte 30% H<sub>2</sub>SO<sub>4</sub>solution as electrolyte 30% NaOH solution as electrolyte
2 In lead accumulator the electrolyte is H2SO4solution is 30% H<sub>2</sub>SO<sub>4</sub> 60% H<sub>2</sub>SO<sub>4</sub> 80% H<sub>2</sub>SO<sub>4</sub> 90% H<sub>2</sub>SO<sub>4</sub>
3 The galvanic or voltaic cells which are rechargeable called as Primary cells Secondary cells Dry cells Infinite cells
4 The voltaic or galvanic cells which cannot be recharged are called Primary cells Secondary cells Infinite cells Fuel cells
5 Electrochemical series is a list of element S arranged into the increasing order of their Standard oxidation potential Standard reduction potential Cell voltage Ionization potential
6 The value of SHE is cathode and anode is always taken to be One Zero Different Same
7 Coupling of Pb with its Pb++/Pb = -0.13 V and Ag with Ag+/ Ag = +0.80 V, the cell reaction
8 The reduction potential to copper electrode is +0.34 V and that of Zn electrode is -0.76 V. when these two are coupled the e.m.f. of the cell is -0.42 V +0.42 -1.10 V +1.10 V
9 A standard hydrogen electrode is used as standard electrode of which electrode potential is arbitrarily taken as +1 -1 0.1 Zero
10 When a metal is dipped in 1 molar of its solution at 298 K. then potential set up is called Standard electrode potential Electric charge Ionization potential Electroplating
11 The oxidation number of free element is always taken to be 0 1 2 -1
12 The function of salt bridge in the galvanic or voltaic cell is to Carry out oxidation at anode To carry out reduction at cathode Carry out electrolysis To prevent the net charge accumulation in either of the half cells
13 The cell which generates electricity as a result of spontaneous oxidation-reduction reaction is called Electrolytic cell Nelson's cell Galvanic cell Down's cell
14 The two half cells of a galvanic cell are connected by Ammeter Salt bridge Hydrogen electrode Copper electrode
15 The process of electrical coating of one metal on another to protect, decorate or to have greater resistance to corrosion is called Electroplating Electrolysis Conduction Induction
16 Purification of an impure copper is made by electrolytic cell, in which impure copper is anode and pure copper is cathode, and the electrolyte used is H<sub>2</sub>SO<sub>4</sub> CuSO<sub>4</sub> ZnSO<sub>4</sub> Na<sub>2</sub>SO<sub>4</sub>
17 Caustic soda is obtained by electrolysis of conc. aqueous solution of NaCI in a cell called Daniell's cell Nelson's cell Down's cell Voltaic cell
18 In the electrolysis of aqueous solution of sodium nitrate, the ions which are reduced at the cathode are H<sub>3</sub>O<sup>+</sup> Na<sup>+</sup> OH<sup>-</sup> NO<sup>3-</sup>
19 Metallic conduction is due to the Movement of electrons Movement of ions Both a and b None of these
20 Cell in which an electric current drives a non-spontaneous reaction is called Electrolytic cell Voltaic cell Biological cell Electrochemical cell
21 The electrolysis of CuSO4aqueous solution using copper as cathode as well an anode the substance which deposits at cathode is H<sub>2</sub>SO<sub>4</sub> Oxygen Copper Hydrogen
22 By using graphite electrode the electrolysis of aqueous solution of NaCI produces at anode H<sub>2</sub>gas Cl<sub>2</sub>gas NaOH No metal
23 When electric current is used to carry out non-spontaneous redox, the process is called Hydrolysis Electrolysis Decomposition Neutralization
24 The reaction is galvanic cell is Spontaneous Non-spontaneous Acid-base None of these
25 When fused PbBr2is electrolyzed Bromine appears at he cathode Lead is deposited at the cathode Lead appears at the anode None of these happens
26 If the salt bridge is not used between two half cells, then the voltage Decrease rapidly Decrease slowly Does not change Drops to zero
27 The electrode through which the electrons enter the electrolytic solution is electrolytic solution is Anode Cathode May be anode or cathode None of these
28 Which of the following statements is true about Galvanic cell Anode is negatively charged Reduction occurs at anode Cathode is positively charge Reduction occurs at cathode
29 The cathodic reaction in the electrolysis of dill H2SO4with Pt electrodes Reduction Oxidation Both oxidation and reduction neither oxidation or reduction
30 In the presence of copper electrodes the electrolysis of aqueous CuSO4produces at cathode H<sub>2</sub>gas O<sub>2</sub>gas SO<sub>2</sub>gas Cu metal
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