Which molecule has no unshared electron pairs?

H_{2}

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O_{2}

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N_{2}

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C O_{2}

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N H_{3}

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Solution

The correct option is A $H_{2}$
Hydrogen atom has only 1 electron in its outermost shell. Thus, it combines with another Hydrogen atom by sharing its only one electron forming a covalent bond to form a Hydrogen molecule.
After the combination, there is no unshared electron pair remaining on the molecule.
Hence option A is the correct answer.

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N_{2}, {C l}_{2}, {N H}_{3}, O_{2}

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