A) \[\begin{align} & \frac{HCl}{pHconcn(m/l)}\frac{NaCl}{pHconcn(m/l)}\frac{NaOH}{pHconcn(m/l)} \\ & \,\,\,\,\,\,\,\,\,3\times {{10}^{-3}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,7\times {{10}^{-5}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,11\times {{10}^{-3}} \\ \end{align}\]
B) \[\begin{align} & \frac{HCl}{pHconcn(m/l)}\frac{NaCl}{pHconcn(m/l)}\frac{NaOH}{pHconcn(m/l)} \\ & \,\,\,\,\,\,\,\,\,\,4\times {{10}^{-4}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,5\times {{10}^{-5}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,10\times {{10}^{-4}} \\ \end{align}\]
C) \[\begin{align} & \frac{HCl}{pHconcn(m/l)}\frac{NaCl}{pHconcn(m/l)}\frac{NaOH}{pHconcn(m/l)} \\ & \,\,\,\,\,\,\,\,\,\,5\times {{10}^{-5}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,7\times {{10}^{-7}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,9\times {{10}^{-5}} \\ \end{align}\]
D) \[\begin{align} & \frac{HCl}{pHconcn(m/l)}\frac{NaCl}{pHconcn(m/l)}\frac{NaOH}{pHconcn(m/l)} \\ & \,\,\,\,\,\,\,\,\,6\times {{10}^{-6}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,7\times {{10}^{-6}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,8\times {{10}^{-6}} \\ \end{align}\]
Correct Answer: B
Solution :
\[\begin{align} & \frac{HCl}{pHconcn(m/l)}\frac{NaCl}{pHconcn(m/l)}\frac{NaOH}{pHconcn(m/l)} \\ & \,\,\,\,\,\,\,\,\,\,4\times {{10}^{-4}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,5\times {{10}^{-5}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,10\times {{10}^{-4}} \\ \end{align}\]
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