Tag: ammonia-properties and uses

Questions Related to ammonia-properties and uses

In Haber's process for the manufacture of ammonia, the catalyst used is :

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

  1. finely divided nickel

  2. finely divided molybdenum

  3. finely divided iron

  4. finely divided platinum

Show answer
Correct Option: C
Explanation:

Finely divided iron is used as catalyst in the manufacture of ammonia by Haber's process

Which of the following can be decomposed chemically?

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

  1. Ammonia

  2. Iron

  3. Calcium

  4. Sulphur

Show answer
Correct Option: A
Explanation:

Ammonia $NH _3$ is a compound which can be decomposed chemically in its elements nitrogen and hydrogen but iron, calcium and sulphur are elements that can not be decomposed further.

Ammonia gas dissolves in water to give $NH _{4}OH$. In this reaction. water acts as :-

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

  1. $An \ acid$

  2. $A \ base$

  3. $A \ salt$

  4. $A \ conjugate \ base$

Show answer
Correct Option: A
Explanation:

$NH _3$+$H _2O$ $\rightarrow$$NH _4^+$ +$OH^-$
Water acts as a proton donor in this reaction. Since, a proton donor is an acid, water acts a Bronsted-Lowry acid.

Nitrogen can be prepared by the action of ammonia on :
chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

  1. Oxygen

  2. Chlorine

  3. Phosphorus

  4. Sulphur

Show answer
Correct Option: B
Explanation:

The action of ammonia on chlorine gas gives nitrogen.

$8NH _3 + 3Cl _2 \rightarrow 6NH _4Cl + N _2$

Hence, option (B) is the correct answer.

Chlorine reacts with excess of ammonia to form :

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

  1. hydrochloric acid and hypochlorous acid

  2. nitrogen dioxide and nitric oxide

  3. hydrogen and oxygen

  4. ammonium chloride and nitrogen

Show answer
Correct Option: D
Explanation:

Chlorine reacts with excess of ammonia to form ammonium chloride and nitrogen. 
$8NH _3+3Cl _2\rightarrow 6NH _4Cl+N _2$

Which of the following gives nitrogen on thermal decomposition?

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

  1. Ammonium nitrite

  2. Ammonia

  3. Ammonium dichromate

  4. Air

Show answer
Correct Option: A,B,C
Explanation:

Nitrogen gas is obtained by thermal decomposition of ammonium nitrite, ammonia and ammonium dichromate.

Ammonium dichromate on heating yields nitrogen, water and chromium(III) oxide and ammonium nitrate on heating yields nitrogen gas and water.

Which of the following is soluble in ammonia ?

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

  1. $Cr(OH) _{3}$

  2. $Cu(OH) _{2}$

  3. $Fe(OH) _{3}$

  4. $Al(OH) _{3}$

Show answer
Correct Option: B
Explanation:

$Cu(OH) _2$ is soluble in $NH _3$. It forms a complex.

$Cu^{2+} + 4NH _3 \longleftrightarrow Cu(NH _3) _4^{2+}$

Nitriding is a process of heating steel in atmosphere of:

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

  1. $NH _{3}$

  2. $N _{2}$

  3. oxygen

  4. Carbon dioxide

Show answer
Correct Option: A
Explanation:

Nitrating is a process of heating high carbon steels, aluminium, molybdenum etc in atmosphere of $NH _3$. Because of nitrating a case hardened surface of $N _2$ is formed on metal surface which comes from Ammonia.

Ammonia evolved from the treatment of $0.30$g of an organic compound for the estimation of nitrogen was passed in $100$ mL of $0.1$M sulphuric acid. The excess of acid required $20$ mL of $0.5$M sodium hydroxide solution for complete neutralization. The organic compound is:

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

  1. thiourea

  2. benzamide

  3. urea

  4. acetamide

Show answer
Correct Option: C
Explanation:

Organic compound+ $H _2SO _4\longrightarrow$

Using Kjeldhal Process to calculate the percentage of nitrogen organic compound
Let unreacted $0.1M(=0.2N)H _2SO _4=Vml$
$\therefore, 20ml$ of $0.5M$ $NaOH=Vml$ of $0.2g$ $NH _2SO _4$
$\therefore 20 \times 0.5=V\times 0.2$
or, $V=50ml$
used $H _2SO _4=100-50=50ml$
$\therefore,$ % nitrogen=$14NV/w$
where $N$=normality of $H _2SO _4$
$V$=Volume of $H _2SO _4$ used
% nitrogen=$1.4\times 0.5\times 50\times 0.3=46.67$ %
Urea=$NH _2CONH _2=28\times 100/60$
$=46.67$ %
Thus, the organic compound is urea.

Ammonium ion is detected by the addition of an alkali.

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

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Hydrogen chloride gas gives dense white fumes (of ammonium chloride) with ammonium hydroxide.
 $\displaystyle HCl + NH _4OH \rightarrow NH _4Cl + H _2O$
Ammonium ion is detected by the addition of an alkali.
Ammonium salts when heated with alkali, give ammonia.
 $\displaystyle NH _4Cl+NaOH \rightarrow NaCl + NH _3 \uparrow +H _2O$
Evolution of ammonia gas can be detected by paper dipped in $\displaystyle CuSO _4$ solution. Ammonia changes the colour of this paper to deep blue due to formation of tetrammine copper complex.
$\displaystyle CuSO _4+4NH _3 \rightarrow [Cu(NH _3) _4]SO _4$