question_answer

Which of the following is the best example of law of conservation of mass                                   [NCERT 1975]

A)                 12 g of carbon combines with 32 g of oxygen to form 44 g of \[C{{O}_{2}}\]           

B)                 When 12 g of carbon is heated in a vacuum there is no change in mass

C)                 A sample of air increases in volume when heated at constant pressure but its mass remains unaltered

D)                 The weight of a piece of platinum is the same before and after heating in air