UPSC NDA II 2018 General Ability Solved Paper

Question : 107 of 150

Marks: +1, -0

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

[NDA II 2018]

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 ore 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.

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