Following solutions were prepared by mixing different volumes of NaOH and HCl of different concentrations :
a. 60 mL \(\frac{M}{10}\) HCl + 40 mL \(\frac{M}{10}\) NaOH
b. 55 mL \(\frac{M}{10}\) HCl +45 mL \(\frac{M}{10}\)NaOH
c. 75 mL \(\frac{M}{5}\) HCl +25 mL \(\frac{M}{5}\) NaOH
d. 100 mL \(\frac{M}{10}\) HCl +100 mL \(\frac{M}{10}\) NaOH
pH of which one of them will be equal to 1?
1
b
2
a
3
c
4
d