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Physical and Chemical Properties of Hydrogen

i F2 has lo...

Question

(i) $F_{2}$ has lower bond dissociation enthalpy than $C l_{2}$ . Why?
(ii) Which noble gas is used in filling balloons for meteorological observations?
(ii) Complete the following equations?
$X e F_{2} + P F_{5} \to$

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Solution

(i) $F_{2}$ has lower bond dissociation energy than $C l_{2}$ because the size of $F_{2}$ is much smaller than $C l_{2}$ as a result interelectronic repulsion works and make $F_{2}$ weak.
(ii) Helium is used in filling balloons for meteorological observations.
(iii) $X e F_{2} + P F_{5} \to [X e F]^{+} [P F_{6}]^{-}$

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Q. (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} ⟶

Q. (a) Give reasons for the following:
(i) Bond enthalpy of

F_{2}

is lower than that of

C l_{2}

P H_{3}

has lower boiling point than

N H_{3}

.
(b) Draw the structures of the following molecules:
(i)

B r F_{3}

(H P O_{3})_{3}

X e F_{4}

OR
(a) Account for the following:
(i) Helium is used in diving apparatus.
(ii) Fluorine does not exhibit positive oxidation state.
(iii) Oxygen shows catenation behavior less than sulphur.
(b) Draw the structures of the following molecules:
(i)

X e F_{2}

H_{2} S_{2} O_{8}

Q. (a) Give reasons for the following.
(i) Bond enthalpy of

F_{2}

is lower than that of

C l_{2}

P H_{3}

has lower boiling point than

N H_{3}

.
(b) Draw the structures of the following molecules.
(i)

B r F_{3}

(H P O_{3})_{3}

X e F_{4}

Q. The increasing order of bond dissociation enthalpy of the following substances is:

F_{2} < C l_{2} < B r_{2} < I_{2}

If the order of bond dissociation enthalpy is true enter 1 else 0.

Q. Assertion :Bond dissociation energy of

F_{2}

is smaller than that of

{C l}_{2}

. Reason: Bond dissociation energy is in order

F_{2} < {C l}_{2} < {B r}_{2} < I_{2}

.

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