Tag: group 17 elements - properties

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Multiple choice group 17 elements - trends in chemical properties group 17 elements - properties p- block elements-ii p-block elements chemistry

$PbI _4$ does not exist because :

  1. iodine is not a reactive
  2. $Pb(IV)$ is oxidizing and $I^-$ is strong reducing agent
  3. $Pb(IV)$ is less stable than $Pb(II)$
  4. $Pb^{4+}$ is not easily formed
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

PbI4 does not exist because the Pb(IV) state is unstable relative to Pb(II) in the presence of a strong reducing agent like iodide. The energy released by the reduction of Pb(IV) to Pb(II) is greater than the energy required to form the Pb-I bonds.

Multiple choice group 17 elements - trends in chemical properties group 17 elements - properties p- block elements-ii p-block elements chemistry

Halogens have:

  1. high ionisation energies

  2. high electronegativities

  3. high electron affinities

  4. All the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Halogens have high ionisation energies, high electronegativities and high electron affilities due to their smallest size in a particular period. As size decreases ionisation energy, elctronegativity and electron affinity increaes

Multiple choice group 17 elements - trends in chemical properties group 17 elements - properties p- block elements-ii p-block elements chemistry

_______ is the only member of the halogen family that has no stable isotopes.

  1. $\displaystyle F$
  2. $\displaystyle Cl$
  3. $\displaystyle Br$
  4. $\displaystyle I$
  5. $\displaystyle At$
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Astatine has many isotopes, all of which are radioactive in nature. Their half-lives are also very small. Hence, astatine has no stable isotopes.

Option $E$ is the correct answer.

Multiple choice group 17 elements - trends in chemical properties group 17 elements - properties p- block elements-ii p-block elements chemistry

Volatile nature of halogens is because:

  1. halogen molecules are bonded by strong forces

  2. halogen molecules are bonded by electrostatic forces

  3. the forces existing between the discrete molecules are only weak Van der Waals forces

  4. halogen molecules are more reactive
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Van der Waals force- It is a general term used to define the attraction of intermolecular forces between molecules.

Van der Waals force $\propto$ Molecular weight
As you go down the group, halogens become less volatile, as their shell size increases. This increases the Van der Waals forces as there are more electrons, hence increasing the force of attraction between molecules. This makes them less volatile.

Multiple choice group 17 elements - trends in chemical properties group 17 elements - properties p- block elements-ii p-block elements chemistry

The element with highest electron affinity among the halogens is :

  1. F
  2. $Cl$

  3. Br
  4. $I$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

As moving down the group electron affinity of elements decreases

But in case of $\textbf{Fluorine}$, it is a small atom with a small amount of space available in its 2p orbital. Because of this, any new electron trying to attach to fluorine experiences lower electron affinity from the electrons already living in the element's 2p orbital. Since chlorine's outermost orbital is a 3p orbital, there is more space, and the electrons in this orbital are inclined to share this space with an extra electron. Therefore, chlorine has a higher electron affinity than fluorine, and this orbital structure causes it to have the highest electron affinity of all of the elements.

Hence electron affinity of $\textbf{Chlorine}$ is higher in halogens.