Consider the following statements.
(i) Atoms of  $H,O,N$  and  $C$  have identical properties but different mass.
(ii) Law of definite proportions fail, when isotopes are considered.
(iii) The ratio of  $N:H$  in  $N{H}_3$  is 1 : 3 and  $N:O$  in nitric oxide is 2 : 1.
(iv) Nuclear reactions do not support law of conservation of mass
Which of the following pairs of statements is true according to Dalton’s atomic theory?