Question

# Give reasons for the following:(i) Oxygen is a gas but sulphur is a solid.(ii) $$O_{3}$$ acts as a powerful oxidising agent.(iii) $$BiH_{3}$$ is the strongest reducing agent amongst all the hydrides of group $$15$$ elements.

Solution

## i. In oxygen molecule intermolecular forces are weak van der Waal's forces which causes it to exist as gas while in sulphur strong $$S=S$$ is not formed so it exist in puckered structure and held together by covalent bond and exist as polymeric molecule.ii. Ozone acts as a powerful oxidizing agent as it can produce nascent oxygen.iii. On moving from top to bottom in hydrides of group $$15$$, bond length increases and the chances of hydrogen removal also increases so oxidation number also increases and $$BiH_3$$ is the strongest reducing agent amongst all the hydrides of group $$15$$.Chemistry

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