StudentAidUnit 16: Unit 16: Electrochemistry — Mcqs
10th Class Chemistry · Unit 16: Electrochemistry
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1.The oxidation number of Mn in K2MnO4:
2.Which element in the following reaction is being reduced? 4HBr(aq) + MnO2(s) → MnBr2(aq) + Br0(g) + 2H2O(l)
3.During electrolysis of dilute solution of H2SO4, using Pt electrodes, which process takes place at the cathode?
4.Which product you will get at the anode when an aqueous solution of CuSO4 is electrolysed using copper electrodes?
5.Which of the following statements is NOT correct about Zn-Cu electrochemical cell?
6.Which product will be obtained at the anode when a concentrated solution of NaCl will be electrolysed?
7.When a dilute aqueous solution of ZnCl2 is electrolysed which product you will get at the cathode?
8.What is produced at the cathode in hydrogen-oxygen fuel cell?
9.Which of the following metals is highest in the electrochemical series?
Oxidation Number of atoms in Compounds and Ions
10.Oxidation number of atoms in a compound helps to identify.
11._____ is an apparent charge on an atom in a compound or anion.
12.The oxidation state of sodium metal is:
13.Elements of groups 2 shows which of oxidation numbers.
14.The elements of group 17 are normally given oxidation number.
15.In CHCl3, the oxidation number of chlorine is:
16.The oxidation number of O in OF2 is:
17.The sum of oxidation numbers of all the atoms present in a neutral compound is always.
Writing Chemical Formulas of Ionic Compounds by Applying Oxidation numbers
18.The element calcium is present in group 2 of the periodic table and its principle oxidation number is_______.
19.The formula of calcium chloride will be:
Writing Chemical Formula of Ionic Compounds using Ionic Charges
20.MnO4- ion has a name:
21.By combining ammonium ion (NH4+) and sulphate ion (SO42-), the compounds formed is:
22.In writing chemical formula of ionic compounds, the oxidation number of cation will go to _______ of anion.
23.The chemical formula of potassium acetate:
24.When calcium (Ca2+) and phosphate (PO43-) ions reacts, the chemical formula of compound is:
Oxidation and Reduction
25.Oxidation and reduction are simultaneous process that always occur _______.
26.Rusting of iron and burning of magnesium in air are _______ processes.
27.CH4(g) + 2O2(g) → CO2(g) + 2H2O(l), in this reaction, CH4 is being _____.
28.The reactant which oxidized the other reactant in a chemical reaction is called:
- a Reducing agent
- b Oxidizing agent
- c Both (a) and (b)
- d Stable agent
29._____ is a process in which oxidation number of an element increases:
30.CuO(s) + H2(g) → Cu(s) + H2O(l) In this reaction, CuO is called _____.
Oxidation and Reduction reactions
31._____ is a reaction in which simultaneous oxidation and reduction takes place.
32.Potassium permanganate acts as a powerful oxidizing agent in _____ medium.
33.Oxalic acid is oxidizes to carbon dioxide by _____.
34.The oxidation number of carbon (C) in C6H12O6 is:
35.When oxidation number of Mn decreased from +7 to +2, it _______ electrons:
36.Aqueous potassium iodide is oxidized to iodine in acidic
37.The oxidation number of Mn in (MnO4-) is:
38.Identify the reducing agent in this reaction: H2S + Cl2 → 2HCl + S
Electrolysis
39.The breakdown of fused ionic compound or aqueous solution by passing electrify is:
40.In the process of electrolysis, ___ reaction takes place by using electrical energy.
41.The electrodes in an electrolytic cell are made up of:
42.In electrolytic cell, the external voltage source forces the reaction to occur by pumping _______ towards one of the electrode:
43.The positive ions of the electrolyte are attracted towards the negative electrode and get _______ in electrolytic cell:
44.If oxidation and reduction at the electrodes _______, the flow of electricity in the external circuit also _______ in electrolytic cell:
45._______ is always occurs at cathode.
Electrolysis of a concentrated Aqueous solution of sodium chloride (Brine) using inert electrode (Graphite / Pt)
46._______ is formed at anode in electrolysis of a concentrated solution of sodium chloride using inert electrode.
- a NaOH
- b Cl2
- c H2
- d O2
47.In electrolysis of concentrated aqueous solution of brine, anode must be made up of graphite to avoid reaction with:
48._______ both migrate towards the cathode in the electrolysis of concentrated aqueous solution of sodium chloride:
49.Hydrogen ions have a _______ tendency to get reduced as composed to sodium ions (Na+):
50.The solution around the cathode becomes _______ due to formation of OH- ions in electrolysis of concentrated aqueous solution of sodium chloride:
51.In electrolysis of concentrated aqueous solution of sodium chloride, the volumes of hydrogen and chlorine gases obtained are:
- a Unequal
- b Cl2 > H2
- c Equal
- d H2 > Cl2
Electrolysis of dilute and concentrated Aqueous solution of metal halides
52.Water is a _______ electrolyte.
53.If aqueous NaCl is electrolyzed, sodium (Na+) and _______ ions are attracted towards cathode:
54.The elements at the top of electrochemical series possess more tendency to _______.
55.If dilute copper chloride (CuCl2) is electrolyzed the product at cathode:
56._______ is obtained at cathode, if dilute magnesium chloride is electrolyzed:
57.More complicated picture is given by electrolysis of dilute and concentrated halides solutions of metals:
- a Nickel and sodium
- b Lead and sodium
- c Lead and nickel
- d Copper and silver
58.At anode, the electrolysis of dilute solutions of halides will deposit:
59.Electrolysis played an important role in industrial preparation of element:
60.The element with lowest standard reduction potential in electrochemical series:
Electrolysis of concentrated Aqueous solutions of Metal Halides
61.In electrolysis of concentrated aqueous solution of metal halides, H+ ions are discharged at cathode, if metal is present higher than _______ in electrochemical series:
62.The electrolysis of concentrated aqueous solution of sodium chloride produces _______ at the cathode:
- a Chlorine gas
- b Sodium metal
- c Hydrogen gas
- d Oxygen gas
63.In the electrolysis of concentrated aqueous solution of copper chloride _______ is discharged at the cathode:
Electrolysis of Molten Lead (II) Chloride
64.Lead chloride is melted upto:
65.In the electrolysis of molten lead chloride, two insert electrodes immersed in molten salt are:
66.In the electrolysis of molten lead (II) chloride, the product formed at cathode:
- a Chlorine gas
- b O2 gas
- c H2 gas
- d Lead metal
Electrolysis of dilute solution of sulphuric acid using inert electrodes (carbon and Pt)
67.Electrolysis of dilute aqueous solution of sulphuric acid produces:
68.Why inert electrodes used in electrolysis of dilute solution of sulphuric acid?
69.The correct reaction in electrolysis of dilute sulphuric acid at cathode is:
Electrolysis of dilute Aqueous solutions of copper sulphate using inert electrodes or copper electrode
70.In the electrolysis of aqueous solution of copper sulphate using inert electrode, the product formed at cathode:
71.The concentration of _______ decreases slowly and blue colour of the solution fades away with the passage of time in the electrolysis of aqueous solution of copper sulphate:
72.The products formed at cathode and anode in electrolysis of dilute aqueous solution of copper sulphate using inert electrode:
Fuel Cells
73.Fuel cells converts chemical energy into _______:
75.Electrodes are made of porous compressed carbon saturated with platinum act as _______ in fuel cell:
76.The overall reaction in fuel cell produces:
77.Fuel cell converts _______%of bond energy into electricity:
78.Fuel cells produces less _______:
79.Hydrogen used in fuel cells can be obtained from _______:
- a Non-renewable sources
- b Renewable sources
- c Natural sources
- d All of these
80.Fuel cells and electric motors are less _______ than petrol engines:
- a Stable
- b Effective
- c Durable
- d Compact
Corrosion
81.Corrosion is a _______ process due to which a metal suffers gradual decay when it interacts chemically with its environment.
82.Galvanization is a common method to protect iron or steel from:
83.In sacrificial protection a more reactive metal like zinc or magnesium is corrode in place of less reactive metal like:
84.The difference in the activity of two metals (Mg and Fe) cause a current to glow, producing corrosion on:
Electroplating
85.The main objectives of electroplating are:
86.The article to be electroplated is made:
87.Electroplating is carried out in a tank made of:
- a Paper
- b Plastic
- c Rubber
- d Cement
88.The condition when one metal is deposited on another to get good deposits:
- a High current density
- b Low current density
- c High temperature
- d High pH
89.In silver plating, the electrolyte used:
90._______ is used as an anode in electroplating of copper:
Galvanic cell
91.Oxidation-reduction reaction can be used to produce electricity in _______ cell:
92.In a galvanic cell, electrons are transferred from:
93.In a galvanic cell, two solutions are kept separate by:
94.Daniel cell produces a voltage of around _______ volts under standard conditions:
Order of reactivity of Metals using voltage Data
95.More easily a metal can oxidize or lose electron, more it will be:
96.A galvanic cell of magnesium and copper produces more voltage than a cell of copper and:
- a Hydrogen
- b Zinc
- c Nickel
- d Iron
97.The reactivity series of metals is called: