Question

Hcl colour pH paper, approximate pH value, nature of substance
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Answer 1

Explanation :

Condition 1st : When colour of paper is blue .

Then '

HCl is a acid when blue paper is dipped in acidic solution then the colour of paper changed into red from blue.

Condition 2nd : when Colour of paper is red.

Then,

If the colour of paper is already red then we dipped the paper in acidic solution then paper doesn't show any change in colour.

And acidic solution have a pH of less then 7.