10 Question-Answer on chemical effects of current
1. Which of the following cells involves similar chemical reactions?
(a) Voltaic cell and Leclanche cell
(b) Daniel cell and dry cell
(c) Voltaic cell and Daniel cell
(d) Dry cell and Leclanche cell
Ans: ( d)
2. What happens during the charging of acid cell?
(a) Voltage increases
(b) Relative density of electrolyte decreases
(c) Anode becomes chocolate brown
(d) None of the above.
Ans: ( a, c)
3. Which of the following is not the advantage of alkali cells over acid cell?
(a) Mechanical strong
(b) Better life
(c) Better operation
(d) Heigher e.m.f.
Ans: (d)
4. Which of the following is not the storage cell?
(a) Acid cell
(b) NIFE cell
(c) Edison cell
(d) Dry cell
Ans: (d)
5. In which of the cell steps need not be taken to avoid local action?
(a) Voltaic cell
(b) Fuel cell
(c) Leclanche cell
(d) Daniel cell
Ans: (b)
6. If a current of 2 A liberates a certain amount of ions, a current of 8 A will liberate
(a) Six times
(b) Four times
(c) Sixteen times
(d) Eight times
Ans: ( b)
7. A copper voltameter and a silver voltameter are connected in series in a circuit. The rate of the increase in the weight of the cathode in the two voltameters will be in the ratio of
(a) Atomic weights of Cu and Ag
(b) Densities of Cu and Ag
(c) Half of the atomic weight of Cu to the atomic weight of Ag
(d) Half of the atomic weight of Ag to half the atomic weight of Cu.
Ans: ( c)
8. Electrochemical equivalent of a substance is the mass of the substance liberated at an electrode in half a second during electrolysis by a current of
(a) 5 A
(b) 6 A
(c) 8 A
(d) 2 A
Ans: (d)
9. What determines the e.m.f. between the two metals placed in an electrolyte?
(a) Relative position of metals in the electrochemical series
(b) Distance between them
(c) Strength of electrolyte
(d) Nature of electrolyte
Ans: (d)
10. Faraday’s law of electrolysis are related to
(a) The atomic number of positive ion
(b) The equivalent weight of electrolyte
(c) The atomic number of negative ion
(d) The velocity of positive ion
Ans: ( b)