$125 \mathrm{mL}$ of $63\% (\mathrm{w}/\mathrm{v})$ ${\mathrm{H}}_2{\mathrm{C}}_2{\mathrm{O}}_4.2{\mathrm{H}}_2\mathrm{O}$ solution is made to react with $25 \mathrm{mL}$ of $40\% (\mathrm{w}/\mathrm{v})$ $\mathrm{NaOH}$ solution.

The resulting solution is (ignoring hydrolysis of ions)

How many litres of ${\mathrm{Cl}}_2$ at $\mathrm{STP}$ will be liberated by the oxidation of $\mathrm{NaCl}$ using $10 \mathrm{g} {\mathrm{KMnO}}_4$ in an acidic medium? (Atomic weight of $\mathrm{Mn}=55$, $\mathrm{K}=39$)

One gram of ${\mathrm{Na}}_3{\mathrm{AsO}}_4$ is boiled with excess of solid $\mathrm{Kl}$ in the presence of strong $\mathrm{HCl}$. The iodine evolved is absorbed in $\mathrm{KI}$ solution and titrated against $0.2 \mathrm{N}$ hypo solution. Assuming the reaction to be ${{\mathrm{AsO}}_4}^{3–}+2{\mathrm{H}}^{+}+2{\mathrm{I}}^{–}\to {{\mathrm{AsO}}_3}^{3–}+{\mathrm{H}}_2\mathrm{O}+{\mathrm{I}}_2$, calculate the volume of hypo consumed [atomic weight of $\mathrm{As}=75$].

If $10 \mathrm{g}$ of ${\mathrm{V}}_2{\mathrm{O}}_5$ is dissolved in an acid and is reduced to ${\mathrm{V}}^{2+}$ by zinc metal, how many moles of ${\mathrm{I}}_2$ are reduced by the resulting solution, if it is further oxidised to ${\mathrm{VO}}^{2+}$ ions?
[Assume no change in the ${\mathrm{Zn}}^{2+}$ ions] (Atomic masses are $\mathrm{V}=51, \mathrm{O}=16, \mathrm{I}=127$)

Suppose $1 \mathrm{mL}$ of a ${\mathrm{KMnO}}_4$ solution reacts with $0.140 \mathrm{g} {\mathrm{Fe}}^{2+}$. If $1 \mathrm{mL}$ of ${\mathrm{KHC}}_2{\mathrm{O}}_4.{\mathrm{H}}_2{\mathrm{C}}_2{\mathrm{O}}_4$ solution reacts with $0.1 \mathrm{mL}$ of the previous ${\mathrm{KMnO}}_4$ solution, how many millilitres of $0.20 \mathrm{M}$ $\mathrm{NaOH}$ will react with $1 \mathrm{mL}$ of the ${\mathrm{KHC}}_2{\mathrm{O}}_4.{\mathrm{H}}_2{\mathrm{C}}_2{\mathrm{O}}_4$ solution mentioned above, in which all the protons $\left({\mathrm{H}}^{+}\right)$ are ionisable?

What is the volume of $3 \mathrm{M} \mathrm{Ba}(\mathrm{OH}{)}_2$ solution required to neutralize completely $120 \mathrm{mL}$ of $1.5 \mathrm{M} {\mathrm{H}}_3{\mathrm{PO}}_4$ solution?

When tetracarbonylnickel $\left(0\right)$ is heated, it dissociates into its components. If $5$ moles of this compound is heated and the resulting gaseous component is absorbed by sufficient amount of ${\mathrm{I}}_2{\mathrm{O}}_5$, liberating ${\mathrm{I}}_2$. What volume of $4\mathrm{M}$ Hypo solution will be required to react with this ${\mathrm{I}}_2$?

$\mathrm{Ni}{\left(\mathrm{CO}\right)}_4 \stackrel{∆}{\to } \mathrm{Ni} + 4\mathrm{CO}$