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H (Valency 1) and O (Valency 2)

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Deduce the molecular formulae of the compound obtained from the following pairs of elements by the cross multiplication method.

H (Valency 1) and O (Valency 2)

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Step 1: Write the symbols of the constituent elements.

Step 2: Write the valency below the respective elements.

Step 3: Cross multiply the valencies.

∴ The molecular formula: H2O.

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