why ammonia is called a polar covalent compound ?
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A molecule is said to be polar when the atoms are different in its electronegativity and its magnitude does not cancel off each other. Ammonia is a covalent compound. It is a compound of two nonmetals, nitrogen and hydrogen, so the difference in electronegativity is not great enough to cause ionic bonding.
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Ammonia is covalent molecule. But due to electronegativity difference between N and H, the shared pair of electrons are attracted by N atom, making the bond polar. As the structure of ammonia is trigonal pyramidal , all the three polar bonds makes the molecule polar. So it is a polar covalent molecule.
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