Tag: ammonia

Questions Related to ammonia

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

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

  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.

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Correct Option: A
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.

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

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

  1. Ag$^{+}$

  2. Cu$^{2+}$

  3. Cd$^{2+}$

  4. Pb$^{2+}$

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Correct Option: D
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.

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

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

  1. $Na$

  2. ${ CS } _{ 2 }$

  3. ${ Br } _{ 2 }+NaOH$

  4. water

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Correct Option: A
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.

 Liquor ammonia bottles are opened only after cooling. This is because:

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

  1. It is a mild explosive

  2. It is a corrosive liquid

  3. It is a lachrymatory

  4. none of these

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Correct Option: A
Explanation:

Liquor ammonia has a mild explosive property, so, the bottle are opened only after cooling

Hydroxide of which compound is insoluble in aquous ammonia solution?

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

  1. ${ FeCl } _{ 3 }$

  2. ${ CuSO } _{ 4 }$

  3. AgCl

  4. ${ ZnSO } _{ 4 }$

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Correct Option: A
Explanation:

Solution:- (A) $Fe{Cl} _{3}$

${Ag}^{+}, {Cu}^{+2}$ and ${Zn}^{+2}$ forms soluble complexes with ammonia.

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

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

  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. $R.N{ H } _{ 2 }+HCL\longrightarrow RN{ H } _{ 3 }CL$

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Correct Option: B

The enthalpy of formation of ammonia is $-46.0KJ{mol}^{-1}$. The enthalpy change for the reaction 
$2{NH} _{3}(g)\rightarrow {N} _{2}(g)+3{H} _{2}(g)$

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

  1. $46.0KJ{mol}^{-1}$

  2. $92.0KJ{mol}^{-1}$

  3. $-23.0KJ{mol}^{-1}$

  4. $-92.0KJ{mol}^{-1}$

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Correct Option: D

Which one does not liberate NH3 when undergoes hydrolysis?

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

  1. Acetaniide

  2. Acetonitrile

  3. Acetamide

  4. Phenyl isocyanide

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Correct Option: D

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

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

  1. $Mg$

  2. $Ca$

  3. $K$

  4. $Li$

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Correct Option: C

The formula of Ammonium Sulphate is:

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

  1. $N{H} _{4}S{O} _{4}$

  2. ${(N{H} _{4})} _{2}S{O} _{4}$

  3. $N{H} _{4}{(S{O} _{4})} _{2}$

  4. $N{H} _{2}{(S{O} _{4})} _{2}$

Show answer
Correct Option: B
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.