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Which one of the following statements about the law of conservation of mass is correct?

General Ability 2018 NDA General Ability 2018 NDA 2018

Options

A given compound always contains exactly same proportion of elements.

When gases combine in a reaction, they do so in a simple ratio by volume, provided all gases are at room temperature.

Matter can neither be created nor destroyed.

Equal volumes of all gases at same temperature and pressure contain equal number of molecules.