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For writing chemical formula of water which tag will be used?

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For writing chemical formula of water which tag will be used?

(a) <sup>

(b) <sub>

(c) <br/>

(d) <ul>

The question was posed to me at a job interview.

Asked question is from HTML5: Beyond Markup in chapter HTML Markup, Forms, Video, Audio & Other Multimedia of HTML

1 Answer

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The correct answer is (b) <sub>

The explanation: The <sub> element is used to contain characters that should be subscript. It is commonly used with foot notes or chemical formulas. E.g. H20, <sup> is use for superscript, <br> is for horizontal break, <ul> is for unordered list.

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