• # question_answer The pH of a solution having the${{\text{H}}^{\text{+}}}$ion concentration of $1\times {{10}^{-4}}g$ions/litre is A)  5                   B)  4C)  3                   D)  2

pH of solution $=-{{\log }_{10}}{{H}^{+}}$ ${{H}^{+}}=1\times {{10}^{-4}}g$ions/litre $pH=-{{\log }_{10}}{{10}^{-4}}$ $=4\log 10=4\times 1$ So, $pH=4.$ Hence, the correct option is [b].