Tag: group 15 elements

Questions Related to group 15 elements

Which of the following halide of nitrogen is unstable in nature?

chemistry p- block elements-ii anomalous properties of nitrogen nitrogen - 15 group group 15 elements

  1. $NCl _3$

  2. $NBr _3$

  3. $NI _3$

  4. $NF _3$

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Correct Option: A,B,C
Explanation:

Nitrogen has very small size as compared to the halogens, which have much larger sizes. Due to this, they can not remain bonded to the nitrogen atom and hence are highly unstable. $NF _3 $ is stable because fluorine and nitrogen have comparable sizes and electronegativity.

In the commercial preparation of dinitrogen by the liquefaction and fractional distillation,dinitrogen is obtained in:

chemistry p- block elements-ii anomalous properties of nitrogen nitrogen - 15 group group 15 elements

  1. liquid form

  2. gaseous form

  3. mixture of liquid and gases

  4. none

Show answer
Correct Option: B
Explanation:

In the commercial preparation of dinitrogen by the liquefaction and fractional distillation,dinitrogen is obtained in gaseous form.

Compound formed on reaction of nitrogen with oxygen at very high temperature is:

chemistry p- block elements-ii anomalous properties of nitrogen nitrogen - 15 group group 15 elements

  1. $NO _2$

  2. $N _2O _4$

  3. $NO$

  4. $N _2O _3$

Show answer
Correct Option: C
Explanation:

$N _2+O _2 \rightarrow NO$

The reaction occurs at temperature greater than 2000 C. 

Nitrogen can combine with:

chemistry p- block elements-ii anomalous properties of nitrogen nitrogen - 15 group group 15 elements

  1. only metals

  2. only non-metals

  3. both metals and non-metals

  4. neither metals nor non-metals

Show answer
Correct Option: C
Explanation:

Nitrogen can combine with both metals and non metals.

$N _2+3H _2 \rightarrow NH _3$
$N _2+Li \rightarrow 2Li _3N$

Which of the following is a part of the catalyst system used in Haber's process?

chemistry p- block elements-ii anomalous properties of nitrogen nitrogen - 15 group group 15 elements

  1. Copper oxide

  2. Iron 

  3. Potassium oxide

  4. Aluminium oxide

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Correct Option: B,C,D

Which of the following can produce ammonia from ammonium salts?

chemistry p- block elements-ii anomalous properties of nitrogen nitrogen - 15 group group 15 elements

  1. Quick lime

  2. Caustic soda

  3. slaked lime

  4. All

Show answer
Correct Option: B,C
Explanation:

Quick lime is $CaO$,caustic soda is$NaOH$, slaked lime is $Ca(OH) _2$.

$NH _4Cl+NaOH \rightarrow NH _3+H _2O+NaCl$
$NH _4Cl+Ca(OH) _2 \rightarrow NH _3+H _2O+CaCl _2$


Haber's process is a/an:

chemistry p- block elements-ii anomalous properties of nitrogen nitrogen - 15 group group 15 elements

  1. endothermic process

  2. exothermic process

  3. spontaneous with no heat liberation

  4. None

Show answer
Correct Option: B
Explanation:

Haber's process is an exothermic process.

$N _2+3H _2 \rightarrow 2NH _3$

Urea on reacting with water gives:

chemistry p- block elements-ii anomalous properties of nitrogen nitrogen - 15 group group 15 elements

  1. $NH _3$

  2. $N _2O _3$

  3. $HNO _2$

  4. $HNO _3$

Show answer
Correct Option: A
Explanation:

$NH _2CONH _2+H _2O \rightarrow 2NH _3+CO _2$

Urea on reaction with water gives carbondioxide and ammonia.

The complex formed in Brown Ring Test is ___________.

chemistry p- block elements-ii anomalous properties of nitrogen nitrogen - 15 group group 15 elements

  1. $[Fe(H _2O) _4(NO) _2]^{2+}$

  2. $[Fe(H _2O) _5(NO)]^{2+}$

  3. $[Fe(H _2O) _3(NO) _3]^{2+}$

  4. $[Fe(H _2O) _6(NO)]^{2+}$

Show answer
Correct Option: B
Explanation:

$[Fe(H _2O) _5(NO)]SO _4$ is the complex formed in brown ring test done to identify the presence of nirates.