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VSEPR Theory

a Draw the mo...

Question

(a) Draw the molecular structures of the following compounds:
(i) $N_{2} O_{5}$
(ii) $X_{e} O F_{4}$
(b) Explain the following observations
(i) Sulphur has a greater tendency for catenation than oxygen.
(ii) $I - C l$ is more reactive than $I_{2}$ .
(iii) Despite lower value of its electron gain enthalpy with negative sign, fluorine $(F_{2})$ is a stronger oxidizing agent than $C l_{2}$ .

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Solution

(b) (i) Due so strong S-S bond and less interelectronic repulsion, sulphur has greater tendency for catenation.
(ii) I-CI bond is polar and hence, more reactive compound to $I_{2}$ in which $I - I$ bond is non-polar.
(iii) Due to high electronegativity and small size of fluorine, it acts as stronger oxidizing agent.

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Q. (a) Draw the structures of the following molecules:
(i)

H_{3} P O_{2}

C l F_{3}

(b) Explain the following observations:
(i) Nitrogen is much less reactive than phosphorus.
(ii) Despite having greater polarity, hydrogen fluoride boils at a lower temperature than water.
(iii) Sulphur has a greater tendency for catenation than oxygen in the same group.

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. Assign reason for the following:
(i)

H_{3} P O_{2}

is a stronger reducing agent than

H_{3} P O_{4}

.
(ii) Sulphur shows more tendency for catenation than Oxygen.
(iii) Reducing character increases from

H F

H I

Q. (a) Draw the structures of the following molecules:
(i)

N_{2} O_{5}

H C l O_{4}

(b) Explain the following observations :
(i)

H_{2} S

is more acidic than

H_{2} O

.
(ii) Fluorine does not exhibit any positive oxidation state.
(iii) Helium forms no real chemical compound.

Q. (a) Complete the following chemical equation :

C u + H N O_{3} (d i l .) \to

X e F_{4} + O_{2} F_{2} \to

(b) Explain the following observations :

(i) Phosphorus has a grater tendency for catenation than nitrogen.
(ii) Oxygen is a gas but sulphur a solid.
(iii) The halogens are coloured. Why?

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