Question

Assertion: $1$ faraday = $96500$ coulombs It is a charge of $1$ mole electrons.

Reason: $1$ Faraday charge liberates one gram equivalent of substance at an electrode.

• A. Both reason and assertion are true and the reason is the correct explanation of the assertion
• B. Assertion is false but the reason is true
• C. Assertion is true but the reason is false
• D. Both assertions and reason are false

Answer 1

The correct option is A

Both reason and assertion are true and the reason is the correct explanation of the assertion

Explanation for assertion statement:

1. Faraday law of electrolysis is applicable to the assertion and the reason.
2. According to faraday’s first law of electrolysis, the mass of ions formed or discharged at the electrode during electrolysis is directly proportional to the amount of electricity passed.
3. $1$ faraday is the charge equals to $96500$ coulombs.
4. Electric charge required = Electric charge on one mole of electrons.= Charge on one electron X avogadro's number.
5. $\Rightarrow 1.6\times {10}^{-19}\times 6.023\times {10}^{23}=96500\raisebox{1ex}{$C$}\!\left/ \!\raisebox{-1ex}{$mol$}\right.$
6. Hence, the assertion statement is correct.

Explanation for reason statement:

1. According to faraday’s first law of electrolysis, the mass of ions formed or discharged at the electrode during electrolysis is directly proportional to the amount of electricity passed.
2. Faraday number is defined as that quantity of electric current which can liberate one gram equivalent of a substance at an electrode during electrolysis.
3. When you pass one faraday of charge, you will obtain one gram equivalent of substance at an electrode.
4. Charge of $1$ faraday liberates one gram equivalent of substance at an electrode.
5. Hence, the reason is the exactly correct explanation of the assertion

Hence option A is correct.