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Question

Give a reason, why?

A. Freezing of water is a reversible change while burning of a candle an irreversible change.

B. Change of seasons is a periodic change while the burning of weather is a non-periodic change.

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Solution

A. Freezing of water is a reversible change as on heating frozen ice changes to water by heating. The burning of the candle is irreversible change as on reversing the conditions we cannot get candle back out of carbon dioxide, water vapors, and wax vapors.
B. Change of season is periodic change as it occurs at regular intervals. Change of weather is non-periodic change because it does not occur periodically at regular intervals. Weather can change suddenly and it may rain in the evening.

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