Which pair of observations cannot both describe the same simple sample under the same conditions?

Type: MCQ • Marks: 1

A. Blue litmus turns red and red litmus turns red

B. Blue litmus remains blue and red litmus remains red

C. Red litmus turns blue and turmeric turns red

D. Blue litmus turns red and red litmus turns blue

Explanation

The first pair indicates acidic and basic behaviour simultaneously, so it is inconsistent as a single simple classification.

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Class 7th Curiosity

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