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Statement I: The phase of a substance is characterized by its distinct molecular arrangement which is homogeneous throughout and is separated from the others by easily identifiable boundary surfaces. Statement II: Phase change is not characterized on molecular structure and/or behaviour of the different phases.

Statement I: The phase of a substance is characterized by its distinct molecular arrangement which is homogeneous throughout and is separated from the others by easily identifiable boundary surfaces. Statement II: Phase change is not characterized on molecular structure and/or behaviour of the different phases. Correct Answer Both Statement I and Statement II are individually true, but Statement II is not the correct explanation of Statement I

A phase is identified as having a distinct molecular arrangement that is homogenous throughout and separated from others by easily identifiable boundary surfaces.

There are three principal phases-solid, liquid and gas. A substance may have several phases within a principal phase, each with a different molecular structure.  Carbon for example may exist as graphite or diamond in the solid phase. Helium has two liquid phases, iron has three solid phases. Ice may exist at seven different phases at high pressures.

Phase change is not characterized with the molecular structure as same phase may have different molecular structure. The phase change is characterized by the moving interface separating two different phases not the behaviour of the different phases.

Therefore both the statements are individually true as the first statement explains about the phases and the second statement is about how phase changes are characterized.

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being traded in China and Tibet. At that time, I was not a Buddhist; I wrote to the Dalai Lama asking him to say that this is harmful and he wrote back to say, “We
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