Tag: anomalous properties of nitrogen

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

Which of the following statements is wrong?

  1. Single N-N bond is stronger than the single P-P bond.
  2. $PH _{3}$ can act as a ligand in the formation of coordination compound with transition elements.
  3. $NO _{2}$ is paramagnetic in nature.
  4. Covalency of nitrogen in $N _{2}O _{5}$ is four.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

N-N sigma bond (single bod)  is weaker than P-P sigma bond (single bond) due to the small bond length between the nitrogen atoms. The lone pair of electrons of both the atoms nitrogen  repel each other making the single bon between $N-N$  weaker than P-P sigma bond.In $P-P$  bond the repulsion between sigma bond and lone pair electrons is less as the size of phosphorous is large.

So statement A is wrong.

Hence option A is correct.

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

Nitrogen forms stable $N _{2}$ molecule but phosphorus is converted to $P _{4}$ from $P _{2}$ because:

  1. p$\pi$-p$\pi$ bonding is strong in phosphorus
  2. p$\pi$-p$\pi$ bonding is weak in phosphorus

  3. triple bond is present in phosphorus
  4. single $P - P$ bond is weaker than $N -N$ bond
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$P$ has empty $d$ orbital, that can be filled by an additional electron. And since its size is bigger it is least likely to handle triple bond, as size increases $\pi$ overlapping decreases. 

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

Which of the following mlecular $P\pi -P\pi $ bond?

  1. ${ NO } _{ 3 }^{ - }$

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

CO (carbon monoxide) has a π bond between carbon and oxygen where both atoms contribute p-orbitals - a pπ-pπ bond. Nitrate and carbonate ions have resonance, and nitrate ion does not contain a double bond structure.

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

Which of the following  molecules is having $2p\pi -3d\pi $ bond?

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

In sulfur trioxide (SO3), sulfur utilizes its empty d-orbitals to form pi bonds with the p-orbitals of oxygen atoms, resulting in p_pi-d_pi bonding. The other species listed either lack vacant d-orbitals of appropriate energy or do not form d-pi bonds in the same manner.

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

Which of the following is correct statement regarding $N(CH _3) _3$ and $N(SiH _3) _3$?

  1. $N(SiH _3) _3$ is planar and more basic than $N(CH _3) _3$
  2. $N(SiH _3) _3$ is planar and less basic than $N(CH _3) _3$
  3. $N(CH _3) _3$ is planar and more basic than $N(SiH _3) _3$
  4. $N(CH _3) _3$ is pyramidal and less basic than $N(SiH _3) _3$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$N(SiH _3) _3$ is planar due to back bonding and $N(CH _3) _3$ more basic due to presence of lone pair electrons.

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

Which of the following pairs is obtained on heating ammonium dichromate?

  1. $\displaystyle { N } _{ 2 }$ and $\displaystyle { H } _{ 2 }O$
  2. $\displaystyle { N } _{ 2 }O$ and $\displaystyle { H } _{ 2 }O$
  3. $\displaystyle { NO } _{ 2 }$ and $\displaystyle { H } _{ 2 }O$
  4. $\displaystyle NO$ and $\displaystyle { NO } _{ 2 }$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ammonium dichromate on heating gives nitrogen, chromic oxide and water.
$\displaystyle { \left( { NH } _{ 4 } \right)  } _{ 2 }{ Cr } _{ 2 }{ O } _{ 7 }\underrightarrow { \Delta  } { N } _{ 2 }+{ Cr } _{ 2 }{ O } _{ 3 }+4{ H } _{ 2 }O$

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

The type of bond between the atoms in a nitrogen molecule is :

  1. hydrogen bond

  2. ionic bond

  3. polar covalent bond

  4. pure covalent bond

  5. metallic bond
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The atomic number of nitrogen is 7.

Its electronic configuration is $[He]{ 2s }^{ 2 }{ 2p }^{ 5 }$
To complete its octet it needs 3 electrons.
As the bonding is between 2 nitrogen atoms each of the atom will share 3 electrons with other to complete their octet.
Sharing of electrons results in covalent bonding.
Hence, they form pure covalent bonds.

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

Nitrogen form $N _2$, but phosphorous form $P _2$, it's at a time convert in $P _4$, reason is : -

  1. Triple bond present between phosphorous atom
  2. $p _\pi p _\pi$bonding is weak
  3. $p _\pi p _\pi$bonding is strong

  4. Multiple bond form easilly
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Phosphorus is unable to form $p\pi-p\pi$ bonds due to larger atomic size. So, $P$ atom is linked with $P$ atoms using $3$ sigma bonds. On the other hand, Nitrogen forms $1-\sigma$ and $2-\pi$ bonds i.e.,  triple bonds and exists as diatomic molecules.