Page No 87: - Chapter 3 - Electrochemistry - Intext Solutions - Ncert Solutions class 12 - Chemistry

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Question 3.10:

If a current of 0.5 ampere flows through a metallic wire for 2 hours, then how many electrons would flow through the wire?

Answer:

I = 0.5 A

t = 2 hours = 2 × 60 × 60 s = 7200 s

Thus, Q = It

= 0.5 A × 7200 s

= 3600 C

We know that   number of electrons.

Then,

Hence,  number of electrons will flow through the wire.

Question 3.11:

Suggest a list of metals that are extracted electrolytically.

Answer:

Metals that are on the top of the reactivity series such as sodium, potassium, calcium, lithium, magnesium, aluminium are extracted electrolytically.

Question 3.12:

What is the quantity of electricity in coulombs needed to reduce 1 mol of

? Consider the reaction:

Answer:

The given reaction is as follows:

Therefore, to reduce 1 mole of  , the required quantity of electricity will be:

=6 F

= 6 × 96487 C

= 578922 C