$100\mathrm{m}\mathrm{L}$ of $0.1\mathrm{M}\mathrm{H}\mathrm{C}\mathrm{l}$  is taken in a beaker and to it $100\mathrm{m}\mathrm{L}$ of $0.1\mathrm{M}\mathrm{N}\mathrm{a}\mathrm{O}\mathrm{H}$  is added in steps of $2\mathrm{m}\mathrm{L}$ and the $\mathrm{p}\mathrm{H}$ is continuously measured. Which of the following graphs correctly depicts the change in  $\mathrm{p}\mathrm{H}$ ?

 

<p>At equivalence point <span class="mathml" contenteditable="false"> <math> <mi mathvariant="normal">p</mi> <mi mathvariant="normal">H</mi> </math> </span> is 7 and <span class="mathml" contenteditable="false"> <math> <mi mathvariant="normal">p</mi> <mi mathvariant="normal">H</mi> </math> </span>increases with addition of <span class="mathml" contenteditable="false"> <math> <mi mathvariant="normal">N</mi> <mi mathvariant="normal">a</mi> <mi mathvariant="normal">O</mi> <mi mathvariant="normal">H</mi> </math> </span>&nbsp;so correct graph is (1).</p>

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