Which of these is an example of a reversible physical change?
a) boiling water
b) breaking glass
c)cracking an egg
d) splitting a diamond

A) boiling water is your answer.

This is a reversible physical change, for you can cool down the temperature, which would cause condensation of the water, returning it to liquid state.

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the child will have heterozygous dominant chromosomes as characters of his father are dominant over the characters of his mother.

the child is heterozygous

atomic number of carbon is 6

electronic configuration of carbon is 1s²2s²2p²

orbital diagram of carbon is as shown here in the image.