Electrochemistry  MCQs

MCQs of Electrochemistry

Showing 151 to 158 out of 158 Questions
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151.
Where is electrolysis not used ?
(a) In refining of metals
(b) In preparation of Cl2 gas
(c) In production of NaOH and KOH
(d) In production of H2O
Answer:

Option (d)

152.
During cell reaction of electrochemical cell _____ .
(a) Gibbs free energy decreases
(b) Gibbs free energy remains constant
(c) No prediction can be done about Gibbs free energy
(d) Gibbs free energy increases
Answer:

Option (a)

153.
What will be the equivalent weight of K2Cr2O7 in acidic medium ? (M = Molecular mass)
(a) M3
(b) M4
(c) M6
(d) M2
Answer:

Option (c)

154.
Which instrument is used to know the direction of flow of current in electrochemical cell ?
(a) Galvanometer
(b) Voltmeter
(c) Ammeter
(d) Potentiometer
Answer:

Option (a)

155.
At 298 K temperature and 1 atmosphere pressure the gas x is passed through 2 M y and 2 M z solution. If reduction potential is z > y > x then, _____ .
(a) y will oxidize x but not z
(b) y will oxidize both y and x
(c) y will reduce both y and z
(d) y will oxidize z and not x
Answer:

Option (a)

156.
1 mole electrons are passed through CuSO4, AgNO3 and AlCl3 What will be the mole ratio of Cu,Ag and Al collected at the electrodes ?
(a) 1 : 1 : 1
(b) 1 : 2 : 3
(c) 2 : 1 : 3
(d) 3 : 6 : 2
Answer:

Option (d)

157.
If 1120 ml hydrogen gas is obtained at STP by passing electric current for 965 seconds, what ampere electric current must have been passed ?
(a) 5 ampere
(b) 10 ampere
(c) 1 ampere
(d) 1.10 ampere
Answer:

Option (b)

158.
Using inert electrodes, 0.5 A current is passed for 12 hours through 1 litre 0.5 M AgNO3 solution. What is the weight of sliver liberated ?
(a) 24.147 gram
(b) 26.17 gram
(c) 28.2 gram
(d) 24.30 gram
Answer:

Option (a)

Showing 151 to 158 out of 158 Questions
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