Q38 of 203 Page 129

What is the difference between 2H and H2?

Both 2H and H2 are the forms of hydrogen. 2H denotes two separate atoms of hydrogen whereas H2 denotes one molecule of hydrogen gas.


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In what form do noble gases occur in nature?

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What do the following denote?

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

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What is the significance of the formula of a substance?