A student has four samples. Which sample is definitely acidic from the given result?

Type: MCQ • Marks: 1

A. Sample Q: red litmus stays red

B. Sample P: blue litmus turns red

C. Sample R: blue litmus stays blue

D. Sample S: both litmus strips stay unchanged

Explanation

Blue-to-red litmus change is direct evidence of an acid.

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Class 7th Curiosity

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