Tag: nitrogen - 15 group

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

The correct order of stability is

  1. ${ N } _{ 2 }>{ N } _{ 2 }^{ + }>{ N } _{ 2 }^{ - }$
  2. ${ N } _{ 2 }>{ N }^{ - } _{ 2 }>{ N } _{ 2 }^{ + }$
  3. ${ N } _{ 2 }^{ + }>{ N }^{ - } _{ 2 }>{ N } _{ 2 }$

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bond order for $N _2=3$

Bond order for $N _2^+=2.5$
Bond order for $N _2^-=2$
Bond order $\propto$ Stability of molecule.
Therefore, the correct order of stability is:
$N _2>N _2^+>N _2^-$

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

Which of the following has $p\pi -d\pi $ bonding?

  1. ${ NO } _{ 3 }^{ - }$
  2. ${ CO } _{ 3 }^{ - }$
  3. ${ BO } _{ 3 }^{ - }$
  4. ${ SO } _{ 3 }^{ - }$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$p\pi-d\pi$ bonding includes d-orbitals,if you observe the options only S belongs to $3^{rd}$ period and has d-orbitals(though unoccupied in ground state).

Other options $C$ and $N$ belongs to $2^{nd}$ period while B belongs to $1^{st}$ period and doesn't have d-orbitals.

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

Which of the following statements is correct ?

  1. In trisilylamine $p\pi - d\pi $ back bonding takes place.
  2. These are two $p\pi - d\pi $ bonds in molecule.

  3. Fraction of s-character in hybride around the central atom in molecule is 0.5
  4. ${\left( {{\text{C}}{{\text{H}} _{\text{3}}}} \right) _{\text{3}}}{\text{COH}}$ is more acidic than ${\left( {{\text{C}}{{\text{H}} _{\text{3}}}} \right) _{\text{3}}}{\text{SiOH}}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In trisilylamine N(SiH3)3, the nitrogen uses its lone pair to form pπ-dπ back bonds with empty d-orbitals of silicon. This is similar to back bonding in trimethylamine N-oxide. Option B is incorrect (no count given), Option C's hybrid claim is questionable, and Option D is wrong - silanols are more acidic than alcohols.

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

Nitrogen differs from P, As, Sb and Bi in the following properties :

  1. It forms diatomic molecule.

  2. It is not able to extent its coordination number beyond four.

  3. Nitrogen does not function as a Lewis acid whereas P, As, Sb and Bi do so.

  4. In all the properties given above.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

As vacant d-orbital are present in P and other elements of this group except N so they can expand their valency and forms stable pentavalence product but due to absence of d-orbitals nitrogen cannot form pentavalence products.

It forms diatomic molecule $N _2$.
Nitrogen does not function as a Lewis acid due to absence of d-orbitals and it is a Lewis base due to presence of lone pair.

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

The anomalous behaviour of nitrogen is due to:

  1. small size and high electronegativity

  2. non availability of d-orbitals in valency shell

  3. ease of multiple bond formation

  4. all are correct
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Nitrogen differs from other members of the group due to its smaller size, high electronegativity, high IE and non availability of d-orbitals. Nitrogen has unique ability to form $p\pi - p\pi $ multiple bonds with itself and with other elements having small size and high electronegativity.

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

An element X combines with hydrogen to form a compound $XH _3$. The element X is placed on the right side ofthe periodic table. What is true about the element X?
A. Has 3 valence electrons.
B. Is a metal and is solid.
C. Is a non-metal and is a gas.
D. Has 5 valence electrons.
E. $XH _3$  reacts with water to form a basic compound?

  1. A, B and C

  2. B,C and D

  3. C, D and E

  4. E, A and B
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Here, $X$ is nitrogen with atomic number 7 and electronic configuration $ { 1s }^{ 2 }{ 2s }^{ 2 }{ 2p }^{ 3 } $ 

It is a non metal belonging to group 15.
Solution of ammonia In water is alkaline in nature and is highly soluble in water.