(A) The $pH$ scale ranges from $0$ to $14$. Solutions with a $pH$ less than $7$ are acidic. As the $pH$ value increases towards $7$,the acidity of the

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(A) The $pH$ scale ranges from $0$ to $14$. Solutions with a $pH$ less than $7$ are acidic. As the $pH$ value increases towards $7$,the acidity of the solution decreases. Therefore,among the given options $(1, 2.3, 4.5, 6)$,the value $6$ is closest to $7$,making it the least acidic solution.