An aqueous solution of a substance shows pH 13. Why is it unsafe to touch it directly?
Answer and explanation
Correct answer: It may be highly basic and caustic
The pH scale expresses hydrogen-ion activity: values well above 7 indicate a strongly basic solution. A pH of 13 is therefore consistent with a highly alkaline, potentially caustic substance that can damage skin and eyes. Option A is correct, so the solution should be handled with gloves and eye protection. Pure water is near pH 7, while acids have pH below 7.
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What is the correct answer to this question?
It may be highly basic and caustic
Why is this the correct answer?
The pH scale expresses hydrogen-ion activity: values well above 7 indicate a strongly basic solution. A pH of 13 is therefore consistent with a highly alkaline, potentially caustic substance that can damage skin and eyes. Option A is correct, so the solution should be handled with gloves and eye protection. Pure water is near pH 7, while acids have pH below 7.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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