Respuesta :

A solution with the pH of 13 is a Strong Base.
.A pH meter is divided into two. The numbers that are lesser than 7 are the pH numbers of acids. The lesser the number, the stronger is the acid. Further, the numbers greater than 7 are for the bases and the stronger the base, the higher is the value for the pH. Thus, the answer to this item is the fourth choice, strong base. 
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