Number of moles of $SnCl_2$ required for the reduction of $1$ mole of $K_2Cr_2O_7$ into $Cr^{3+}$ (in acidic medium) is:

For a redox reaction,how many moles of electrons will one mole of $MnO_4^-$ accept in an acidic medium?

Aqueous solutions of $Na_2S_2O_3$ on reaction with $Cl_2$ gives

What is the equivalent mass of $IO_4^-$ when it is converted into $I_2$ in an acidic medium?

In the reaction $2[Fe(CN)_6]^{3-} + H_2O_2 + 2OH^{-} \rightarrow 2[Fe(CN)_6]^{4-} + 2H_2O + O_2$,what is the equivalent weight of the reductant? $(Fe = 56, C = 12, N = 14, O = 16, H = 1)$

What is the number of moles of electrons gained by one mole of oxidizing agent in the following redox reaction?
$Zn_{(s)} + 2HCl_{(aq)} \longrightarrow ZnCl_2(aq) + H_2(g)$