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Effect on Indicators by Acids and Bases

In an experim...

Question

In an experiment to test the pH of a given sample using pH paper, four students recorded the following observations.

Sample taken pH paper colour turned to

(I) Water Green

(II) Dil. HCl Red

(III) Dil. NaOH Blue

(IV) Dil. acetic acid Orange

Which one will have pH value of 7?

A

IV

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B

I

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C

II

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D

III

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Solution

The correct option is B
I

Sample I will show up pH = 7 since water is neutral and hence turns the pH paper green.

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