Assertion :Water is an oxide of hydrogen represented by the formula $H_{2} O$ . However, oxide of fluorine is represented by the formula $O F_{2}$ and not $F_{2} O$ . Reason: Formulas of any compounds are contain in such a way that more electropositive element comes first and less electropositive element later.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
It is the general convention that formulas of any compounds are contained in such a way that more electropositive element comes first and less electropositive element later. In $H_{2} O$ , hydrogen is less electropositive than oxygen and hence its formula is $H_{2} O$ . Fluorine is more electronegative than oxygen, the formula is written as $O F_{2}$

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