question_answer 38)

  Dalton's atomic theory successfully explained. (i) law of conservation of mass                                  (ii) law of constant composition (iii) law of radioactivity                                                   (iv) law of multiple proportion (a) (i), (ii) and (iii)           (b) (i), (iii) and (iv)              (c) (ii), (iii) and (iv)         (d) (i), (ii) and (iv)

Answer:

  (d) Dalton's atomic theory successfully explained the laws of chemical combination but no point about radioactivity was mentioned by Dalton in his theory.