Consider the following statements. (1) Atoms of H, O, N and C have identical properties but different mass. (2) Matter is divisible into atoms which are further indivisible. (3) The ratio of N: H in \(\mathrm{NH_3}\) is 1 : 3 and N : O in nitric oxide is 2 : 1. (4) Dalton's atomic theory supports law of conservation of mass. Which of the following pairs of statements is true according to Dalton's atomic theory?