Which one of the following has pyramidal structure ?

{N H}_{3}

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{S i F}_{4}

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H_{2} O

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{B F}_{3}

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Solution

The correct option is A ${N H}_{3}$
$N H_{3}$ has pyramidal shape
Explanation:
Here N atom is surrounded by
four electrons pairs ( 3 bonded and 1 lone pair )
Expected angle should be $109^{\circ} 28^{'}$ but the actual angle is $107^{\circ}$ because of the repulsion between lone pair and bond pair .

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