Question

A cell constituted by two electrodes A (`"E"_("A"^+//"A")^0` = 0.35 V) and B (`"E"_("B"^+//"B")^0` = + 0.42 V) has value of `"E"_"cell"^0` equal to _________.

Options

• 0.77 V

• 0.07 V

• –0.77 V

• –0.07 V

Answer 1

A cell constituted by two electrodes A (`"E"_("A"^+//"A")^0` = 0.35 V) and B (`"E"_("B"^+//"B")^0`= + 0.42 V) has a value of `"E"_"cell"^0` equal to 0.07 V.

Explanation:

The species which has lesser value of standard reduction potential (E⁰) is better reducing agent.

A ⇒ Reducing agent = it will undergo oxidation = Anode

B ⇒ Oxidising agent = it will undergo reduction = Cathode

`"E"_"cell"^0 = "E"_"cathode"^0 - "E"_"anode"^0`

`"E"_"cell"^0 = + 0.42 " V" - 0.35 " V"`

`"E"_"cell"^0 = 0.07` V