Q37 of 203 Page 129

In what form do noble gases occur in nature?

The atoms of only a few elements are chemically unreactive which are called noble gases (such as helium, neon, argon etc.). They exist in the free state (as single atom).


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What do the symbols, H2, S and O4 mean in the formula H2SO4?

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In what form does oxygen gas occur in nature?

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What is the difference between 2H and H2?

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What do the following denote?

(i) N (ii) 2N (iii) N2 (iv) 2N2