All of the following could represent a physical process except:

Formation of a gas

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A release of energy from a system into the surroundings

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The appearance of substances in two phases of matter at the same time

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Appearance of a smell that was no previously present

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Solution

The correct option is A Formation of a gas
Formation of gas not a physical change because some reactions has taken place which leads to the formation of gas hence, it is a chemical change.
Whereas all the three are physical changes, as they are not producing any new products.

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(b) What type of substance could Y be? Name one substance like Y.

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All of the following could represent a physical process except:

The correct option is A Formation of a gasFormation of gas not a physical change because some reactions has taken place which leads to the formation of gas hence, it is a chemical change.Whereas all the three are physical changes, as they are not producing any new products.

The correct option is A Formation of a gas
Formation of gas not a physical change because some reactions has taken place which leads to the formation of gas hence, it is a chemical change.
Whereas all the three are physical changes, as they are not producing any new products.