Tag: ammonia

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

Which of the following gives nitrogen on thermal decomposition?

  1. Ammonium nitrite

  2. Ammonia

  3. Ammonium dichromate

  4. Air
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
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.

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

Nitriding is a process of heating steel in atmosphere of:

  1. $NH _{3}$
  2. $N _{2}$

  3. oxygen

  4. Carbon dioxide
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

  1. thiourea

  2. benzamide

  3. urea

  4. acetamide
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

Ammonium ion is detected by the addition of an alkali.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
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.
$\displaystyle CuSO _4+4NH _3 \rightarrow [Cu(NH _3) _4]SO _4$