When a drop of an unknown solution X is placed on a strip of pH paper, a deep blue colour is produced. This sample should be which one of the following?

Water

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NaOH

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HCl

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Lemon juice

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Solution

The correct option is B
NaOH

Deep blue colour of pH paper is shown by substances having pH between 9 - 10. Since these pH values are shown by bases hence, NaOH will show up this colour.

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When a drop of an unknown solution X is placed on a strip of pH paper, a deep blue colour is produced. This sample should be which one of the following?

The correct option is B NaOH Deep blue colour of pH paper is shown by substances having pH between 9 - 10. Since these pH values are shown by bases hence, NaOH will show up this colour.

The correct option is B
NaOH

Deep blue colour of pH paper is shown by substances having pH between 9 - 10. Since these pH values are shown by bases hence, NaOH will show up this colour.