A) calamine
B) haematite
C) chalcopyrite
D) bauxite
Correct Answer: B
Solution :
\[\underset{base}{\mathop{N{{H}_{3}}}}\,+{{H}^{+}}\xrightarrow[{}]{{}}\underset{\begin{smallmatrix} conjugate \\ acid \end{smallmatrix}}{\mathop{NH_{4}^{+}}}\,\] Hence, ammonium ion is a conjugate acid of ammonia.
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