a (a) All amines react with mineral acids such as $HCl$, ${H_2}S{O_4},\,HN{O_3}$ etc. to form salts which are soluble in water.
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An organic compound '$A$' contains nitrogen and chlorine. It dissolves readily in water to give a solution that turns litmus red. Titration of compound '$A$' with standard base indicates that the molecular weight of ' $A$ ' is $131\,\pm\,2$. When a sample of '$A$' is treated with aq. $NaOH$, a liquid separates which contains $N$ but not $Cl$. Treatment of the obtained liquid with nitrous acid followed by phenol gives orange precipitate. The compound '$A$' is.