Answers of the questions below...

1. Give reason in the Following questions
a. A solid does not diffuse into another solid.
d. Heat energy is needed to change liquid into vapour.

Dear student,

1)
a)Solids can diffuse to some extent.
Solids have very less lnter atomic space, hence when two solids are kept close to each other undisturbed for a longer period of time, due to vibrational motion, some solids do diffuse.

d) In order to change the liquid into the vapour, particle's kinetic energy must increase so that it can move more freely and with more inter particle spaces. This is achieved by the heat energy.

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