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(B) The $pH$ of a solution is defined as $pH = -\log [H^{+}]$.When the concentration $[H^{+}]$ changes by a factor of $1000$,the change in $pH$ is giv

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decreases by $3$ units

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(B) The $pH$ of a solution is defined as $pH = -\log [H^{+}]$.When the concentration $[H^{+}]$ changes by a factor of $1000$,the change in $pH$ is given by $\Delta pH = -\log(\frac{[H^{+}]_{final}}{[H^{+}]_{initial}})$.Since the concentration changes by a factor of $1000$,we have $\frac{[H^{+}]_{final}}{[H^{+}]_{initial}} = 1000 = 10^3$.Therefore,$\Delta pH = -\log(10^3) = -3$.This means the $pH$ value decreases by $3$ units.

When the hydrogen ion concentration $[H^{+}]$ changes by a factor of $1000$,the value of $pH$ of the solution $.........$.

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