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Question

Reaction of hydrochloric acid with ___________ does not produces salt.

A
ammonium ion
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B
ammonia
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C
nitrogen
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D
none of the above
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Solution

The correct option is B ammonia
HCl is the proton donor, and hence the acid. NH3 is the proton acceptor, and the base. NH+4 is the conjugate acid and Cl is the conjugate base. This is a classic Bronsted-Lowry acid/base reaction.
The reaction is a bit trickier because when NH3 is added to water it reacts with the water to produce a slight amount of NH+4 and OH . The water behaves as the Bronsted-Lowry acid. As HCl is added, the H+ reacts with OH to make water and shifts the equilibrium toward the NH+4 / OH side until all of the NH3 is converted to NH+4.
This reaction also occurs in the gas phase, but produces a solid product.
NH3(g)+HCl(g)NH4Cl(s)

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