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Noble gases Questions in English

Class 12 Chemistry · p-Block Elements (Class 12) · Noble gases

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351
MediumMCQ
The oxidation state of $Xe$ in $XeO_3$ and the bond angle in it respectively are:
A
$+6, 109^{\circ}$
B
$+8, 103^{\circ}$
C
$+6, 103^{\circ}$
D
$+8, 120^{\circ}$

Solution

(C) The oxidation state of $Xe$ in $XeO_3$ is calculated as follows:
$x + 3(-2) = 0$
$x - 6 = 0$
$x = +6$
In $XeO_3$,$Xe$ undergoes $sp^3$ hybridization with one lone pair,resulting in a pyramidal geometry.
The bond angle in $XeO_3$ is approximately $103^{\circ}$.
352
EasyMCQ
Ionisation potential values of noble gases decrease down the group with increase in atomic size. Xenon forms binary fluorides by the direct reaction of elements. Identify the correct statement$(s)$ from below.
A
Only the heavier noble gases form such compounds
B
It happens because the noble gases have higher ionisation energies
C
It happens because the compounds are formed with electronegative ligands
D
Octet of electrons provide the stable arrangements

Solution

(A) The ionisation potential of noble gases decreases down the group as the atomic size increases.
Because of the lower ionisation energy of heavier noble gases like $Xe$,they can be oxidised by highly electronegative elements like fluorine.
Therefore,only the heavier noble gases form such compounds,and this occurs because they form compounds with electronegative ligands like $F$.
While the octet rule provides stability,it is not the reason why $Xe$ forms fluorides; rather,it is the ease of ionisation of heavier noble gases.
353
DifficultMCQ
Which statements are $NOT$ $TRUE$ about $XeO_{2}F_{2}$?
$A$. It has a see-saw shape.
$B$. $Xe$ has $5$ electron pairs in its valence shell in $XeO_{2}F_{2}$.
$C$. The $O-Xe-O$ bond angle is close to $180^{\circ}$.
$D$. The $F-Xe-F$ bond angle is close to $180^{\circ}$.
$E$. $Xe$ has $16$ valence electrons in $XeO_{2}F_{2}$.
Choose the correct answer from the options given below.
A
$B, C$ and $E$ only
B
$B$ and $D$ only
C
$A$ and $D$ only
D
$B, D$ and $E$ only

Solution

(A) The structure of $XeO_{2}F_{2}$ is based on a trigonal bipyramidal geometry with one lone pair in the equatorial position. This results in a see-saw shape.
Analysis of statements:
$A$. $TRUE$: The molecule has a see-saw shape.
$B$. $FALSE$: $Xe$ has $7$ electron pairs in its valence shell ($5$ bonding pairs and $1$ lone pair,where double bonds count as $1$ electron pair for geometry).
$C$. $FALSE$: The $O-Xe-O$ bond angle is close to $106^{\circ}$ (equatorial-equatorial).
$D$. $TRUE$: The $F-Xe-F$ bond angle is close to $170^{\circ}-180^{\circ}$ (axial-axial).
$E$. $FALSE$: $Xe$ has $14$ valence electrons in $XeO_{2}F_{2}$ ($8$ from $Xe$ + $2$ from $2F$ + $4$ from $2O = 14$).
Therefore,the statements that are $NOT$ $TRUE$ are $B, C$ and $E$.

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