Assertion :Molecular formula of water is $(H_{2} O)$ . Reason: One molecule of water contains two atoms of hydrogen and one atom of oxygen.

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
A chemical formula that represents the composition of a molecule of the substance in terms of the symbols of the elements present in the molecule is also called molecular formula.
For example, the molecular formula of water is $H_{2} O$ , which means that one molecule of water contains two atoms of hydrogen and one atom of oxygen.

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(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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Choose the correct option.

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Assertion :Molecular formula of water is (H2O). Reason: One molecule of water contains two atoms of hydrogen and one atom of oxygen.

Assertion :Molecular formula of water is $(H_{2} O)$ . Reason: One molecule of water contains two atoms of hydrogen and one atom of oxygen.