Milk to cheese is an example of _________ change.

Explanation

`(i) 2Na_2 O_2 + 2H_2 O to 4 NaOH +O_2`
`(ii) 2KClO_3 overset(HnO_2 Delta)to 2KCl +3O_2`
`(iii) KMnO_4 overset(Delta)to KmnO_4 + MnO_2 +O_2`
Uses of dioxygen
(i) For cutting and welding of metal.
(ii) For the manufacture of Steel
(iii) For the combustion of fuels in rockets,
(iv) For breathing in hospitals, high altitude flying.