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Question

Which of the following changes are chemical and irreversible?
A. Bubbling of oxygen gas through water.
B. Burning of wax of a candle.
C. Emitting of light from an electric bulb on passing electric current.
D. Passing of carbon dioxide gas through lime water.

A
A and B
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B
C and D
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C
B and D
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D
A and D
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Solution

The correct option is C B and D
Burning of candle wax and passing CO2 through lime water are chemical and are irreversible. In both these changes, new products are formed. Burning of candle wax results into formation of CO2 and CO2 on passing through lime solution forms CaCO3.
CO2+Ca(OH)2CaCO3+H2O

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