Tag: ammonia-properties and uses

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Multiple choice chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

Ammonia is used in detection of $Cu^{2+}$ ion because:

  1. aqueous solution of $NH _{3}$ reacts with $Cu^{2+}$ ion to form deep blue coloured complex
  2. $NH _{3}$ reacts with $Cu^{2+}$ ion to give blue precipitate of $CuO$
  3. aqueous solution of $NH _{3}$ reacts with $Cu^{2+}$ ion to form white coloured complex.
  4. $NH _{3}$ reacts with $Cu^{2+}$ ion to give green precipitate.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ammonia acts as a Lewis base due to the presence of lone pair of  on the nitrogen atom.so,it can form coordinate bond transition metal cations to from complex compounds.Ammonia reacts with a solution of $Cu^{2+}$  to from a deep blue coloured complex.The reaction for the above complex  compound can be written as follows:

$Cu^{2+}(aq) + 4 NH _3(aq)\rightarrow [Cu(NH _3) _4]^{2+}(aq)$

                                                                              Deep Blue

Hence option A is correct.

Multiple choice chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

Ammonia is a Lewis base. It forms complexes with cations. Which one of the following cations does not form complex with ammonia?

  1. Ag$^{+}$
  2. Cu$^{2+}$
  3. Cd$^{2+}$
  4. Pb$^{2+}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Ammonia is a Lewis base. It forms complexes with cations of transition elements. $Pb^{2+}$ does not form a complex with ammonia as lead ($Pb$) is not a transition element. Lead ($Pb$) is a p - block element.

Hence option D is correct.
Multiple choice chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

$-{ NH } _{ 2 }$ group shows acidic nature while reacts with this reagent:

  1. $Na$
  2. ${ CS } _{ 2 }$
  3. ${ Br } _{ 2 }+NaOH$

  4. water
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A compound shows acidic nature if the opposite atom or compound of the bond shows basic character. Sodium is a metal and it is basic in nature. $-NH _2$ shows acidic character when it reacts with sodium.

Multiple choice chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

Acidic nature of amino group is shown by the reaction :-

  1. $R{ - }{ N }{ H } _{ 2\quad }+NOCL\longrightarrow RCI+{ N } _{ 2 }+{ H } _{ 2 }O$
  2. $2RN{ H } _{ 2 }+2Na\longrightarrow 2RNH.Na+{ N } _{ 2 }$
  3. $R.C{ H } _{ 2 }N{ H } _{ 2 }+HN{ O } _{ 2 }+{ N } _{ 2 }+{ H } _{ 2 }{ O }$
  4. $R.N{ H } _{ 2 }+HCL\longrightarrow RN{ H } _{ 3 }CL$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The acidic nature of the amino group (or more accurately, the hydrogen atoms attached to the nitrogen) can be demonstrated by reactions with strong bases or active metals like sodium, where the hydrogen is replaced.

Multiple choice chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

Which one does not liberate NH3 when undergoes hydrolysis?

  1. Acetaniide

  2. Acetonitrile

  3. Acetamide

  4. Phenyl isocyanide
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Acetamide, acetanilide, and acetonitrile all contain nitrogen in forms that can be hydrolyzed to release ammonia or ammonium ions. Phenyl isocyanide (phenyl carbylamine) does not undergo hydrolysis to liberate ammonia.

Multiple choice chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

Which of the following metal on burining in mosist air does not give smell of ammonia?

  1. $Mg$
  2. $Ca$
  3. $K$
  4. $Li$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Magnesium, calcium, and lithium react with atmospheric nitrogen when burned to form nitrides (Mg3N2, Ca3N2, Li3N), which release ammonia upon hydrolysis with moisture. Potassium is highly reactive but does not form a stable nitride under these conditions, so it does not produce ammonia.

Multiple choice chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

The formula of Ammonium Sulphate is:

  1. $N{H} _{4}S{O} _{4}$
  2. ${(N{H} _{4})} _{2}S{O} _{4}$
  3. $N{H} _{4}{(S{O} _{4})} _{2}$
  4. $N{H} _{2}{(S{O} _{4})} _{2}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ammonium sulfate is made by treating ammonia, often as a by-product from coke oven, with sulfuric acid: 

$2 NH _3$ + $H _2SO _4 \rightarrow$   $(NH _4) _2SO _4$
Option "B" is correct.