Advertisements
Advertisements
प्रश्न
Consider the following half cell reactions:
\[\ce{Mn^{2+} + 2e^- -> Mn}\] E0 = –1.18 V
\[\ce{Mn^{2+} -> Mn^{2+} + e^-}\] E0 = –1.51 V
The E0 for the reaction \[\ce{3Mn^{2+} -> Mn + 2Mn^{3+}}\], and the possibility of the forward reaction are respectively.
पर्याय
2.69 V and spontaneous
–2.69 V and non spontaneous
0.33 V and Spontaneous
4.18 V and non spontaneous
उत्तर
–2.69 V and non spontaneous
Explanation:
\[\ce{Mn^{2+} + 2e^- -> Mn (E^0_{red}) = -1.18 V}\]
\[\ce{2[MN^{2+} -> MN^{3+} + e^-] (E^0_{ox}) = -1.51 V}\]
\[\ce{3Mn^{2+} -> Mn + 2Mn^{3+}}\] `"E"_"cell"^0` = ?
`"E"_"cell"^0` = `("E"_"ox"^0) + ("E"_"red"^0)`
= – 1.51 – 1.18 and non spontaneous
= – 2.69 V
Since E0 is – ve ∆G is +ve and the given forward cell reaction is non spontaneous.
APPEARS IN
संबंधित प्रश्न
During electrolysis of molten sodium chloride, the time required to produce 0.1 mole of chlorine gas using a current of 3A is ___________.
The number of electrons delivered at the cathode during electrolysis by a current of 1A in 60 seconds is ____________.
(charge of electron = 1.6 × 10−19 C)
Among the following cells
I) Leclanche cell
II) Nickel – Cadmium cell
III) Lead storage battery
IV) Mercury cell
Primary cells are:
In \[\ce{H2 - O2}\] fuel cell the reaction occurs at cathode is:
State Faraday’s Laws of electrolysis.
A current of 1.608A is passed through 250 mL of 0.5 M solution of copper sulphate for 50 minutes. Calculate the strength of Cu2+ after electrolysis assuming volume to be constant and the current efficiency is 100%.
In fuel cell H2 and O2 react to produce electricity. In the process, H2 gas is oxidised at the anode and O2 at cathode. If 44.8 litre of H2 at 25°C and 1 atm pressure reacts in 10 minutes, what is average current produced? If the entire current is used for electro deposition of Cu from Cu2+, how many grams of deposited?
8.2 × 1012 litres of water is available in a lake. A power reactor using the electrolysis of water in the lake produces electricity at the rate of 2 × 106 Cs−1 at an appropriate voltage. How many years would it like to completely electrolyse the water in the lake? Assume that there is no loss of water except due to electrolysis.
Derive an expression for the Nernst equation.
Explain the function of H2 – O2 fuel cell.
