Question

❄️Refer to the attachment please
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Answer 1

Answer:

pH helps us to know whether the solution is acidic or basic in nature. It depends on hydrogen ion concentration of the given solution.

If pH if less than 7 the solution is acidic and if it is greater than 7, the given solution is basic in nature.

According to your question, the answer is:

S>P>R>Q

hope, it helps.