List of top Chemistry Questions on types of cells

Iron oxide $FeO$, crystallises in a cubic lattice with a unit cell edge length of $50 \mathring{A}$ If density of the $FeO$ in the crystal is $40\, g \,cm ^{-3}$, then the number of $FeO$ units present per unit cell is ______ (Nearest integer) Given: Molar mass of $Fe$ and $O$ is $56$ and $16 \, g \, mol ^{-1}$ respectively $N _{ A }=60 \times 10^{23} mol ^{-1}$

For the cell reaction
\(2Fe^{3+}+2I^{-}_{(aq)}\rightarrow2Fe^{2+}+I_2{(aq)}\)
\(E^{\ominus}_{cell}=0.24\ V \ at \ 298 k.\)The standard Gibbs energy \((\Delta_rG^{\ominus})\) of the cell reaction is:
[Given that Faraday constant \( F=96500 \ C\ mol^{-1}]\)  

Red blood cells are placed in a solution and neither haemolysis nor crenation occurs. Therefore, the solution is

Two cells each of same emf e but of internal resistances $ r_1 $ and $ r_2 $ are connected in series through an external resistance R. If the potential difference between the ends of the first cell is zero, what will be the value of R in terms of $ r_1 $ and $ r_2 $ ?

The electrolyte used in Lechlanche cell is