Electrochemistry - Online Test

Q1. Difference between ionic (electrolytic) and electronic conductivity is that electronic conductance takes place in metals by ________ conductance takes place in solutions by ions
Answer : Option A
Explaination / Solution:

Electrolytic conductivity is due to the movement of ions and electronic conductivity is due to the movement of electrons.

Q2. When measuring conductivity with a conductivity cell, cell constant denoted by the symbol G* is given by (electrode area of cross section equal to ‘A’ and separated by distance ‘l’)
Answer : Option C
Explaination / Solution:

Cell constant = length of electrodes/ Area of electrodes.

Q3. Conductivity always decreases with decrease in concentration both, for weak and strong electrolytes because of the fact that
Answer : Option C
Explaination / Solution:

Conductivity of solution decreases with dilution because number of ions per unit volume decreases.

Q4. Kohlrausch law of independent migration of ions states
Answer : Option A
Explaination / Solution:

Statement of Kohlrausch Law.

Q5. According to Faraday’s First Law of ElectrolysisThe amount of chemical reaction which occurs at any electrode during electrolysis by a current is proportional to the
Answer : Option B
Explaination / Solution:

Faraday’s first law of electrolysis states that amount of substance deposited at any of the electrode is directly proportional to amount of charge passed.

Q6. According to Faraday’s Second Law of Electrolysis the amounts of different substances liberated by the same quantity of electricity passing through the electrolytic solution are proportional
Answer : Option B
Explaination / Solution:

The amounts of different substances liberated by the same quantity of electricity passing through the electrolytic solution are proportional to their chemical equivalent weights.

Q7. Charge on one mole of electrons - Faraday is approximately
Answer : Option B
Explaination / Solution:

Charge on one electron is 1.6 x  C. 1 mole of electron 6.023x electrons. So charge on one electron is 1.6 x  x 6.023 x  = 96500 C

Q8. In the primary batteries
Answer : Option C
Explaination / Solution:

Primary batteries cannot be recharged and reused.

Q9. A secondary cell after use ________ recharged by passing current through it in the ________ so that it can/can’t be used again.
Answer : Option B
Explaination / Solution:

Secondary cell can be recharged and reused.

Q10. Fuel cells are ________ that are designed to convert the energy of combustion of fuels like hydrogen, methane, methanol, etc. directly into_________.
Answer : Option A
Explaination / Solution:

Fuel Cells converts energy coming from the combustion of fuels directly to electrical energy.