InterviewSolution
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InterviewSolution
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Liquid ammonia undergoes self-ionization ,which may be represented asA. `2NH_(3) hArr NH_(4)^(+)+NH_(2)^(+)`B. `NH_(4)OH hArr NH_(4)^(+)+OH^(-)`C. `NH_(3)+H_(2)O hArr NH_(4)^(+)+OH^(-)`D. `NH_(3)+H_(2)O hArr NH_(4)^(+) +OH^(-)` |
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Answer» Correct Answer - 4 Liquids ammonia is ionized to a slight extent: `2NH_(3) hArr NH_(4)^(+)+NH_(2)^(-)` of. `2H_(2)O hArr H_(3)O^(+)+OH^(-)` Whereas in water acids are substances that provide hydroxoide ions and alkalis are substances that provide hydroxylions, ions in liquid ammonia acids give to ammonium ions, (e.g. ammonium salst) and give rise to amide ions, (e.g. ammonium salts) and bases give rise to amide ions (e.g. ionic amides). Thus in liuid ammonia an ammono-acid neutralises an ammono-base to goce a salt and ammonia (an extact parallel with aqueous systems).e.g. `underset("ammono -acid")(NH_(4)^(+)Cl)+underset("ammono- base")(Na^(+)NH_(2)^(-))rarr underset("salt")(Na^(+)Cl^(-))+underset("ammonia")(2NH_(3))` or `NH_(4)^(+)+NH_(2)^(-)rarr2NH_(3)` Ionic nitrides such as lithium nitride function as bases in liquid ammonia: `3NH_(4)^(+)Cl^(-)+(Li^(+))_(3)N^(3-)rarr3Li^(+)Cl^(-)+4NH_(3)` or `3NH_(4)^(+)+N^(3-)rarr4NH_(3)` More parallels with aqueous systems exist, for instance hydrolysis and ammonolysis are essentially very similar processes `SiCl_(4)overset("hydrolysis")rarrSi(OH)_(4)overset("heat")rarrSiO_(2)+2H_(2)O` `3SiCl_(4)overset("ammonolysis")rarr 3Si(NH_(2))_(4)overset("heat")rarr Si_(3)N_(4)+8NH_(3)` |
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