11th class (FSc) Chemistry Unit 10 MCQs
26. The reduction potential of Zn is:
a. +0.3476V
b. +0.76 V
c. -0.76V
d. -0.3476V
27. Standard hydrogen Electrode is made of:
a. Cu foil
b. Ag foil
c. Pt foil
d. Au foil
28. The highest reduction potential in the electrochemical series is of F2 and its value is:
a. +2.87V
b. +3.87V
c. -2.81V
d. -3.87V
29. Stronger the oxidation agent is, greater is the:
a. Redox potential
b. Oxidation potential
c. emf of cell
d. Reduction potential
30. Emf of Zn-Cu cells is:
a. 1.0 V
b. 0.0 V
c. 1.1 V
d. 0.05
31. If a strip of Cu metal is placed in a solution of FeSO4.
a. Fe precipitated out
b. Copper will be deposed
c. No reaction take place
d. Cu and Fe both dissolve
32. A single lead acid cell provides volts:
a. 6
b. 2
c. 8
d. 4
33. Anode and cathode in alkaline cell is made up of respectively:
a. Zn and Ag2O
b. MnO2 and Zn
c. Zn and MnO2
d. Pb and PbO2
34. The voltage of Nickel cadmium cell is:
a. 1.4 V
b. 1 V
c. 1.6 V
d. 1.2 V
36. The electrolyte used in fuel cell is:
a. Aqueous NaCl
b. NaNO3
c. AqueousH2SO4
d. KOH
37. Fuel cells convert chemical energy into:
a. Electrical energy
b. Heat energy
c. Mechanical energy
d. Light energy
38. The cathodic reaction in the electrolysis of dil. H2SO4 with Ptelectrode is:
a. Both reduction, oxidation
b. Reduction
c. Neither reduction nor oxidation
d. Oxidation
39. Which of the following statement is not correct about galvanic cell?
a. Cathode is positively charged
b. Anode is negatively charged
c. Reduction occurs at cathode
d. Reduction occurs at anode
40. Stronger the oxidizing agent, greater is the:
a. Redox potential
b. oxidation potential
c. e.m.f of cell
d. Reduction potential
41. If the salt bridge is not used between two half cells, than the voltage:
a. Redox potential
b. Decrease rapidly
c. Drop to zero
d. Decrease slowly
42. If a strip of a Cu metal is placed in a solution of FeSO4:
a. Cu and Fe both dissolve
b. Cu will be deposited
c. No reaction take place
d. Fe is precipitated out
43. In electrolytic cell, a salt bridge is used in order to:
a. Mix solution of two half cells
b. Pass the electric current
c. Allow movement of ions between two half cells
d. Prevent the flow of ions
44. In all oxidation reactions, atoms of an element in a chemical specials lose electrons and increase their:
a. Electrode
b. Oxidation states
c. Negative charges
d. Reduction
45. In electrolysis aqueous CuCl2 , the metal deposited at cathode is:
a. -2
b. Zero
c. -1
d. +2
46. Inthe figure given below, the electron flow in external circuit is from:
a. Porous partition to zine electron
b. Copper to zine electron
c. Zine to copper electron
d. Right to left
47. In SO4-2the oxidation number of sulphur is:
a. -6
b. -8
c. +6
d. +8
48. Coinage matels Cu, Ag, and Au are the least reactive because theyhave:
a. Negative oxidation potential
b. Negative reduction potential
c. Positive oxidation potential
d. Positive reduction potential
49. Study the following facts: Zn → Zn+2 +2e– E= +0.76V Cu → Cu+2 2e– Eo=-0.34 V
a. Cu+2+Zn → Cu + Zn+2
b. Cu + Zn+2
c. Cu+2+Zn+2 → Cu + Zn+2
d. Cu-2+Zn-2Cu+Zn
50. Keeping in mind the electrode potential, which one of the followingreactions is feasible?
a. Cu+2+Zn →Cu + Zn+2
b. Zn-2+Cu →Cu+2+Zn
c. Cd+MgSO4 →CdSO4 →CdSO4+Mg
d. Ze+MgSO4<ZnSo+Mg
51. The diagram shows galvanic cell. The current will flow from:
a. Hydrogen electrode to HCl solution
b. Hydrogen electrode to copper electrode
c. CuSo4 solution to hydrogen electrode
d. Copper electrode to hydrogen electrode
52. Study the following redo reaction: 10Cl+16H+2MnO4+ → 5Cl+2Mn+2+Bh2O
a. Chlorine is reduced from zero to -1
b. Manganese is oxidized from+7 to +2
c. Manganese is reduced from+7 to +2
d. Hlorine ions are reduced from -1 to zero
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