
Interpretation:
The balanced chemical equation that represents a physical change needs to be determined.
Concept introduction:
The change that affects only the form of a chemical substance but the chemical composition remains same is said to be physical change.

Answer to Problem 4STP
The correct option is (b),
Explanation of Solution
Reason for correct option:
The above chemical equation represents a physical change as the nitrogen changes its state from liquid to gas but composition of nitrogen remains same throughout the process that is,
Reason for incorrect options:
The following chemical equations represents a chemical change where the composition of the reactants and products are different
In this reaction, hydrogen gas combines with oxygen gas to produce a new compound that is liquid water.
In this reaction, solid potassium chlorate decomposes to produce a new compound that is solid potassium chloride and oxygen gas.
In this reaction, solid zinc reacts with aqueous hydrogen chloride to produce a new compound that is aqueous zinc chloride and hydrogen gas.
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