A student is given the information like dissociates 100%, slippery in touch and have pH 13.5 about an unknown solution so the unknown solution is a strong base.
pH value of any solution tells about the acidity or basicity of the solution, according to the pH scale.
pH ranges from 0 to 14, acidic solutions have the pH range from 0 to 7, neutral solutions have pH 7 and basic solution have pH range from 7 to 14. In the question given that pH of the unknown solution is 13.5 which means that given solution is basic in nature. Also given that solution shows 100% dissociation, it means basic solution is strong as it shows full dissociation and slippery behavior is the physical property of bases.
Hence option (2) is correct i.e. Strong base.
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