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   To find this answer:   Oxygen has an oxidation number of -2.   Hydrogen has an oxidation number of +1, and there are 3 of them   you w â¦ ant to get the oxidation numbers to add up to 0, so it would  be neutral.    -2 + 3(+1) = +1    Now, to get this to equal zero, it means that N has to be -1.
NH3 is a colorless gas with a pungent smell at room temperature. Its melting point is -77.73 ÌC (-107.914 ÌF), boiling point -33.34 ÌC (-28.012 ÌF). Ammonia is an important material to produce nitrogen fertilizer. Ammonia in high concentration is hazardous. Example Reactions: