question_answer

pH of the solution : \[\left( \begin{align}   & \text{10 }\underset{+}{\mathop{\text{litre }}}\,\text{of 0}\text{.03 N X (OH}{{\text{)}}_{2}}\,(\text{strong diacidic base)} \\  & \text{5 litre of 0}\text{.08 M HN}{{\text{O}}_{3}} \\  & \text{485 litre of 0}\text{.01 M NaN}{{\text{O}}_{3}} \\ \end{align} \right)\]

A)  \[3.7\]                          

B)  \[11.0\]

C)  \[7.0\]                          

D)  \[10.0\]