The combustion of candles, containing paraffin wax, to carbon dioxide and water vapor is:

sublimation as well as chemical reaction with oxygen

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only sublimation

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not sublimation but a chemical reaction with oxygen

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none of above

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Solution

The correct option is B not sublimation but a chemical reaction with oxygen
The term sublimation refers to a physical change of state and is not used to describe transformation of a solid to a gas in a chemical reaction. The combustion of candles, containing paraffin wax, to carbon dioxide and water vapor is not sublimation but a chemical reaction with oxygen.

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Similar questions

The combustion of candles, containing paraffin wax, to carbon dioxide and water vapour is sublimation.

Burning of a candle is a chemical as well as physical change, why?

1. The physical change occurs when the wax of candle melts and it loses its shape
2. The chemical change is combustion of fuel in presence of oxygen. This leads to the production and emission of carbon dioxide from the flame
3. The burning of a candle is only a chemical change
4. The burning of a candle is only a physical change

Q. Which of the following chemical reaction is balanced as well as is combustion reaction?

Q. Assertion :The burning of a candle is both a physical and a chemical change. Reason: Burning of candle melts the wax and hence physical state of wax has changed from solid to liquid. Again the wax combines with the atmosphere oxygen and changes to carbon dioxide, heat and light.

560 ml of carbon monoxide is mixed with 500 ml of oxygen and ignited. The chemical equation for the reaction is as follows:

$2 C O + O_{2} \to 2 C O_{2}$

Calculate the volume of oxygen used and carbon dioxide formed in the above reaction.

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