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

Type: MCQ • Marks: 1

A. Sample P: red litmus turns blue

B. Sample R: red litmus stays red

C. Sample S: both litmus strips stay unchanged

D. Sample Q: blue litmus stays blue

Explanation

Red-to-blue litmus change is direct evidence of a base.

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Class 7th Curiosity

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