On adding which of the following will the $ \text{pH} $ of 20 ml of $ 0.1 \, \text{N} \, \text{HCl} $ not be altered?

Question

1 ml of $1 \, \text{N} \, \text{HCl}$

20 ml of distilled water

1 ml of $0.1 \, \text{N} \, \text{NaOH}$

500 ml of $ \text{HCl} $ with $ \text{pH} = 1 $

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