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12th Tamil Nadu Board
IMPORTANT
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How many faradays of electricity are required for the following reaction to occur MnO4-→ Mn+2

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Important Questions on Electro Chemistry

HARD
12th Tamil Nadu Board
IMPORTANT
Chemistry Standard 12 Vol II>Chapter 2 - Electro Chemistry>EVALUATION>Q 8
The current strength of 3.86 A was passed through molten calcium oxide for 41 minutes and 40 seconds. The mass of calcium in grams deposited at the cathode is (atomic mass of Ca is 40 gmol and 1 F = 96500 C).
HARD
12th Tamil Nadu Board
IMPORTANT
Chemistry Standard 12 Vol II>Chapter 2 - Electro Chemistry>EVALUATION>Q 9
During electrolysis of molten sodium chloride, the time required to produce 0.1 mole of chlorine gas using a current of 3 A is
HARD
12th Tamil Nadu Board
IMPORTANT
Chemistry Standard 12 Vol II>Chapter 2 - Electro Chemistry>EVALUATION>Q 10
The number of electrons delivered at the cathode during electrolysis by a current of 1 A in 60 seconds is (charge of electron = 1.6 × 10-19 C).
MEDIUM
12th Tamil Nadu Board
IMPORTANT
Chemistry Standard 12 Vol II>Chapter 2 - Electro Chemistry>EVALUATION>Q 11
Which of the following electrolytic solution has the least specific conductance
HARD
12th Tamil Nadu Board
IMPORTANT
Chemistry Standard 12 Vol II>Chapter 2 - Electro Chemistry>EVALUATION>Q 12
While charging lead storage battery
HARD
12th Tamil Nadu Board
IMPORTANT
Chemistry Standard 12 Vol II>Chapter 2 - Electro Chemistry>EVALUATION>Q 13
Among the following cells
I) Leclanche cell
II) Nickel–Cadmium cell
III) Lead storage battery
IV) Mercury cell
Primary cells are-
HARD
12th Tamil Nadu Board
IMPORTANT
Chemistry Standard 12 Vol II>Chapter 2 - Electro Chemistry>EVALUATION>Q 14
Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because
HARD
12th Tamil Nadu Board
IMPORTANT
Chemistry Standard 12 Vol II>Chapter 2 - Electro Chemistry>EVALUATION>Q 16
In H2-O2 fuel cell, the reaction occurs at the cathode is