A solution is prepared by dissolving a solid mixture of ${\mathrm{K}}_2{\mathrm{C}}_2{\mathrm{O}}_4$ and ${\mathrm{KHC}}_2{\mathrm{O}}_4$. A $10 \mathrm{mL}$ portion of this solution required $10 \mathrm{mL}, 0.05 \mathrm{M} \mathrm{KOH}$ solution for titration reaction. In a seperate analysis $10 \mathrm{mL}$, of the same stock solution required $10 \mathrm{mL}, 0.06 \mathrm{M}$ acidified ${\mathrm{KMnO}}_4$ solution for titration. Which of the following are correct?

The original mixture contains ${\mathrm{K}}_2{\mathrm{C}}_2{\mathrm{O}}_4$ and ${\mathrm{KHC}}_2{\mathrm{O}}_4$ in 2:1 molar ratio

20 mL of the original stock solution requires 6 milli-equivalents of acidified dichromate solution for titration
 

 The original mixture contains ${\mathrm{K}}_2{\mathrm{C}}_2{\mathrm{O}}_4$ and ${\mathrm{KHC}}_2{\mathrm{O}}_4$ in 2:1 molar ratio.
 

20 mL of the original stock solution require 3 millimoles of acidified dichromate solution for titration