A dilute solution of sulphuric acid is electr | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) The reactions at the electrodes are:At anode: $2H_2O \rightarrow O_2(g) + 4H^+ + 4e^-$At cathode: $4H^+ + 4e^- \rightarrow 2H_2(g)$Total charge pa

Vedclass · Accepted Answer

$127$

Vedclass · Answer

(A) The reactions at the electrodes are:At anode: $2H_2O ightarrow O_2(g) + 4H^+ + 4e^-$At cathode: $4H^+ + 4e^- ightarrow 2H_2(g)$Total charge passed $Q = i 	imes t = 0.10 \ A 	imes 2 	imes 3600 \ s = 720 \ C$.Number of moles of electrons $n_e = \frac{Q}{F} = \frac{720}{96500} \approx 0.00746 \ mol$.From the stoichiometry,$4 \ mol$ of electrons produce $1 \ mol$ of $O_2$ and $2 \ mol$ of $H_2$ (total $3 \ mol$ of gas).Total moles of gas produced $n_{total} = \frac{n_e}{4} + \frac{n_e}{2} = \frac{3}{4} n_e = 0.75 	imes 0.00746 = 0.005595 \ mol$.Volume at $STP = n_{total} 	imes 22.7 \ L \ mol^{-1} = 0.005595 	imes 22.7 \approx 0.127 \ L = 127 \ cm^3$.

Similar Questions

What is the quantity of electricity (in Coulombs) required to deposit all the silver from $250 \text{ mL}$ of $1 \text{ M AgNO}_3$ solution?

Consider the following reaction:
$MnO_4^- + 8H^{+} + 5e^- \rightarrow Mn^{2+} + 4H_2O$,$E^\circ = 1.51 \ V$
The quantity of electricity required in Faraday to reduce five moles of $MnO_4^-$ is ..... .

Aluminium oxide may be electrolysed at $1000 \, ^\circ C$ to furnish aluminium metal (At. Mass $= 27 \, amu$; $1 \, F = 96,500 \, C$). The cathode reaction is $Al^{3+} + 3e^- \to Al^0$. To prepare $5.12 \, kg$ of aluminium metal by this method would require:

$A$ current of $0.4 \ A$ is passed through excess of molten $MgCl_2$ for $9.65 \times 10^4 \ sec$. The mass of $Mg$ deposited at the cathode is .............. $gm$

Two electrolytic cells,one containing acidified ferrous chloride $(FeCl_2)$ and the other containing acidic ferric chloride $(FeCl_3)$,are connected in series. When an electric current is passed through the cells,what is the ratio of iron deposited at the cathodes in the two cells?

Vedclass Test Series

Exam Paper Generator

Online Exam Module