Experiment: A litmus paper was dipped into a lemon juice sample.Observation: The blue litmus turned red.Question: What does this confirm?
Correct answer: A. Lemon juice is acidic in nature.
- A. Lemon juice is acidic in nature.
- B. Lemon juice is neutral.
- C. It contains basic salts.
- D. Litmus is unreactive with lemon.
Explanation
The correct answer is that lemon juice is acidic in nature. The change in color of the litmus paper from blue to red confirms the presence of an acidic substance. The other options are incorrect because the observation clearly shows an acidic property, not neutrality, basicity, or lack of reaction.
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About Scientific Reasoning
Scientific reasoning evaluates hypotheses through observations, variables, controls, measurements and experimental results. Questions involve identifying independent and dependent variables, recognising a fair test, interpreting tables or graphs, distinguishing evidence from opinion, and deciding whether data supports, rejects or leaves a hypothesis unresolved.
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