Ph paper is a acid base indicator which is used to identify the acidic or basic nature of a substance.
→ if ph no. is less than 7, then the substance has acidic nature
→ if ph no. is more than 7 , then the substance has basic nature
→ if ph paper is equal to 7 , then the substance is neutral
so, solution with less number of ph will be acidic and would contain H+ ions co
hence solution with ph number 4 has more H+ ions concentration.

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