Which of the following is the best example of law of conservation of mass ?

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12 g of carbon combines with 32 g of oxygen to form 44 g of $C O_{2}$

When 12 g of carbon is heated in vacuum, there is no change in mass

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

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

answer is A.

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Detailed Solution

The law of conservation of mass is best described by the statement, Total mass of reactants=Total mass of products

In option(1), there are two reactants and one product; mass of reactants equals the mass of products=44g

In options (2), (3) and (4), there is only one substance, there is no chemical change and no new Product is formed.

So, conservation of mass principle is irrelevant for them.

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