(i) Which allotrope of phosphorus is more reactive and why?
(ii) How the supersonic jet aeroplanes are responsible for the depletion of ozone layers?
(iii) $F_{2}$ has lower bond dissociation enthalpy than $C l_{2}$ . Why?
(iv) Which noble gas is used in filling balloons for meteorological observations?
(v) Complete the equation: $X e F_{2} + P F_{5} ⟶$

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Solution

(i) White phosphorus is most reactive of all the allotropes of phosphorus because it is unstable due to the angular strain on $P_{4}$ molecule with the bond angle of $60^{o}$

(ii) Supersonic jet fly in the stratosphere near the ozone layer, they are responsible for the depletion of ozone layer. The oxide emitted from the exhausts of supersonic jet aeroplanes readily combine with ozone to form nitrogen dioxide and diatomic oxygen.
$N O + O_{3} \to N O_{2} + O_{2}$

(iii) The size of a fluorine atom is very small as compared to a chlorine atom. Therefore, the repulsion between electrons in the outer most shell of the two atoms in a fluorine molecule is much greater than that in a chlorine molecule. Hence, it requires less energy to break up the fluorine molecule, making its bond dissociation energy lesser than that of chlorine molecule.

(iv) Helium, being light, non-inflammable and unreactive, is used for filling of balloons for metrological observations.

(v) $X e F_{2} + P F_{5} \to [X e F]^{+} + [P F_{6}]^{-}$

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Similar questions

(a) Account for the following:

(i) Interhalogens are more reactive than pure halogens.

(ii) $N_{2}$ is less reactive at room temperature.

(iii) Reducing character increases from $N H_{3} t o B i H_{3}$ .

(b) Draw the structures of the following:

(i) $H_{4} P_{2} O_{7}$ (Pyrophosphoric acid)

(ii) $X e F_{4}$

(a) Which poisonous gas is evolved when white phosphorus is heated with conc. NaOH solution? Write the chemical equation involved.

(b) Which noble gas has the lowest boiling point?

(d) What happens when $H_{3} P O_{3}$ is heated?

(e) Complete the equation:

$P b S + O_{3} \to$

N_{2} O_{5}

X_{e} O F_{4}

I - C l

I_{2}

(F_{2})

C l_{2}

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