Tag: nitrogen

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

Nitrogen gas is very difficult to identify because of its :

  1. High dissociation energy

  2. Characteristic colour

  3. Unreactive nature

  4. High electronegativity
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Nitrogen is commonly referred to as and used as an inert gas (high abundance & low cost.) Due to its inert nature it does not react with other compounds. Hence, Nitrogen gas is very difficult to identify because of its nonreactive nature. 

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

Nitrogen is used for filling the electric bulbs, because it is: 

  1. Lighter than air

  2. Capable of giving more light by the bulb

  3. Not helpful in burning

  4. Not poisonous
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

You can't fill a bulb with air or combustion of hot tungsten wire at high temperature will take place in presence of oxygen. You can't maintain vacuum either or external atmospheric pressure will break the glass. So, you have to fill it with non-reactive gas like nitrogen.

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.