Consider the following statements:

I. The freezing of water into ice is a chemical change.

II. The changes occur in the internal molecular composition, is a chemical change.

III. A new substance is obtained in a chemical change.

IV. The change in shape, size and state is chemical change.

Which of the statements given above are correct?

Statement $\mathrm{I}$: Glass is not considered as a true solid.

Statement $\mathrm{II}$: Glass does not have a definite melting point.

Complete the following sentence by choosing an option given below.

The substance which is to be dissolved is called (I) ...... and the medium in which it is dissolved is called (II) .......... .

Statement$-\mathrm{I}:$Conversion of blue copper sulphate to black cupric oxide on heating is a physical change.

Statement$-\mathrm{II}:$ A change in which, chemical composition does not change is called physical change.

What are the elements which are liquids at room temperature and standard pressure?

I. Helium

II. Mercury

III. Chlorine

IV. Bromine

Select the correct answer using the codes given below: