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a
A sample of CaCO3 contains Ca = 40%, C= 12%, and O = 48%.If the law of constant composition is true, then the mass of Ca in 10 g of CaCO3 from another source is 4.0 g.
b
12 g of carbon is heated in vacuum and there is no change in the mass, is the best example of the law of conservation of mass.
c
Air is heated at constant pressure and there is no change in mass but the volume increases, is the best example of the law of conservation of mass.
d
SO2 gas was prepared by (i) heating Cu with conc H2SO4, (ii) burning sulphur in oxygen, (iii) reacting sodium sulphate (Na2SO4) with dilute H2SO4. It was observed that in each case, S and O combine in the ratio of 1:1. This data illustrates the law of constant composition.
answer is A.
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