Tag: nitrogen and sulfur

Questions Related to nitrogen and sulfur

Nitrogen gas is very difficult to identify because of its :

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

  1. High dissociation energy

  2. Characteristic colour

  3. Unreactive nature

  4. High electronegativity

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Correct Option: C
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. 

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

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

  1. Lighter than air

  2. Capable of giving more light by the bulb

  3. Not helpful in burning

  4. Not poisonous

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Correct Option: C
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.

The fixation of nitrogen can be brought artificially also.

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

  1. True

  2. False

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Correct Option: A
Explanation:

The fixation of nitrogen can be brought artificially also by usage of Nitrogen Fertilizers.

As artificial fixation is possible, the given statement is true. 

Nitrogen gas turns moist blue litmus paper red.

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

  1. True

  2. False

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Correct Option: B
Explanation:

Nitrogen is a neutral gas hence, it does not show any change with Litmus and does not change the color of litmus paper.

Hence, the statement 'Nitrogen gas turns moist blue litmus paper red' is false. 

Which of the following applications reveal that nitrogen is inert?

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

  1. Tinned food products

  2. Making of fertilizers

  3. Refrigerant

  4. Electric bulbs

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Correct Option: A,D
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.

Nitrogen can exhibit $+1$ oxidation state.

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

  1. True

  2. False

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Correct Option: A
Explanation:

Nitrogen exhibits several oxidation states, ranging between -3 to +5, which includes +1.

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

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

  1. $N _2O _5$

  2. $NH _3$

  3. $NF _3$

  4. $NCl _3$

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Correct Option: D
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.

The total number of electrons that take part in forming bonds in $N _2$ is:

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

  1. 2

  2. 4

  3. 6

  4. 10

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Correct Option: C
Explanation:

$N \equiv N$
In $N _2$ there are 3 bonds between Nitrogen atoms and each bond is formed by 2 electrons. So, 3 bonds make it $3(2)=6$ electrons in total.

Kjeldahl's method cannot be used for:

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

  1. $PhNO _2$

  2. $PhNHCOPh$

  3. Azobenzene

  4. Pyridine

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Correct Option: A,C,D
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.

Kjeldahl's method can be used for estimation of nitrogen in:

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

  1. ${C} _{6}{H} _{5}{NO} _{2}$

  2. Pyridine

  3. ${C} _{6}{H} _{5}N=N{C} _{6}{H} _{5}$

  4. ${C} _{6}{H} _{5}NHCO{CH} _{3}$

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Correct Option: A