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Multiple choice chemistry nitrogen and sulfur nitrogen gas component of air - nitrogen nitrogen

Which of the following applications reveal that nitrogen is inert?

  1. Tinned food products

  2. Making of fertilizers

  3. Refrigerant

  4. Electric bulbs
Reveal answer Fill a bubble to check yourself
A,D Correct answer
Explanation

Nitrogen gas is used in food packaging to prolong shelf life and preserve the freshness, integrity, and quality of the delivered product. The presence of oxygen introduces moisture which can deteriorate the food quality.

There is no vacuum in the electric bulb. On the contrary, argon gas or argon gas mixed with a little nitrogen is filled in the bulb under some pressure. Years ago there was a practice to leave vacuum inside the bulb so as to prevent the burning of tungsten filament at high temperature inside the bulb.

Multiple choice chemistry nitrogen and sulfur nitrogen gas component of air - nitrogen nitrogen

Which of the following is an explosive compound of $N _2$?

  1. $N _2O _5$
  2. $NH _3$
  3. $NF _3$
  4. $NCl _3$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$NCl _3$ is explosive. 

Halogen in the +1 oxidation state is a good oxidizing agent and it can oxidize the nitrogen to the highly stable $N _2$ and get itself reduced to $Cl _2$ , both stable gases with a release of energy.
Therefore, NCl3 is explosive.

Hence, option (D) is the correct answer.

Multiple choice chemistry nitrogen and sulfur nitrogen gas component of air - nitrogen nitrogen

Kjeldahl's method cannot be used for:

  1. $PhNO _2$
  2. $PhNHCOPh$

  3. Azobenzene

  4. Pyridine
Reveal answer Fill a bubble to check yourself
A,C,D Correct answer
Explanation

Kjeldahl's method is a method for the quantitative determination of nitrogen contained in organic substances as well as nitrogen contained in unorganic compounds ammonia and ammonium.

But, Kjeldahl's method cannot be used for nitrogen determination of compounds having nitro group or azo-group or nitrogen present in rings as the nitrogen of these compounds cannot be converted to ammonium sulphate $(NH _4) _2SO _4$ under the condition of this method.
Hence, option A,C and D.

Multiple choice chemistry nitrogen and sulfur nitrogen gas component of air - nitrogen nitrogen

Which of the following compound has nitrogen percentage highest?

  1. Ammonium nitrate

  2. Ammonium sulphate

  3. Calcium cyanamide

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

Urea (CO(NH2)2) has a molecular weight of 60 g/mol and contains two nitrogen atoms, providing a nitrogen mass percentage of about 46.6 percent, which is higher than ammonium nitrate, ammonium sulphate, or calcium cyanamide.

Multiple choice chemistry nitrogen and sulfur nitrogen gas component of air - nitrogen nitrogen

Nitrogen gas is prepared :

  1. by heating ammonium nitrate.

  2. by reacting chlorine with liquor ammonia.
  3. by passing $ HNO _3 $ vapours on red hot copper

  4. by beating lead nitrate.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

to prepare pure nitrogen in laboratory a mixture of ammonium chloride and sodium nitrite is heated.  The product formed is ammonium nitrite.  This compound is very unstable and breaks into nitrogen and water.

Multiple choice chemistry nitrogen and sulfur nitrogen gas component of air - nitrogen nitrogen

(i) $BaC _2+N _2\overset{\Delta}{\rightarrow} (B)$

(ii) $CaC _2+N _2\overset{\Delta}{\rightarrow} (A)$

Identify $(A)$ and $(B)$:

  1. $A: Ca(N=C=N)$ ; B: $Ba(C\equiv N) _2$
  2. $A: Ca(N=C=N)$ ; B:$Ba _2(C\equiv N) _4$
  3. $A: Ca(N=C=N) _2$ ; B:$Ba(C\equiv N) _2$
  4. $A: Ca(N=C=N) _2$ ; B: $Ba _2(C\equiv N) _4$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Reaction:
$CaC _2+N _2\overset{\Delta}{\rightarrow}  Ca(N=C=N)$
$BaC _2+N _2\overset{\Delta}{\rightarrow}  Ba ( CN) _2$