<p>0.6 g of urea on strong heating with NaOH evolves&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>N</mi><msub><mi>H</mi><mn>3</mn></msub></math>. Liberated&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>N</mi><msub><mi>H</mi><mn>3</mn></msub></math>&nbsp;will combine completely with which of the following HCl solution ?</p>