Which of the following is a spontaneous reaction at room temperature?
Correct answer: C. Lighting a matchstick
- A. Removing sodium chloride from water
- B. Boiling water
- C. Lighting a matchstick
- D. Increasing the height of a ball from the ground to an elevated table
Explanation
A spontaneous reaction is one that proceeds on its own once initiated. Lighting a matchstick is spontaneous after the initial ignition because the chemical reaction sustains itself without needing additional energy. In contrast, boiling water at room temperature, separating salt from water, and lifting a ball all require continuous or external energy inputs, and are therefore non-spontaneous processes.
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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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