I would go with option #4, reduced use of resources!
:V
Answer:
The same holds true for pH values above 7, each of which is ten times more alkaline (another way to say basic) than the next lower whole value. For example, pH 10 is ten times more alkaline than pH 9 and 100 times (10 times 10) more alkaline than pH 8.
Explanation:
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The reaction in which more reactive element replace a less reactive element from its compound is called displacement reaction.
Ex:-
