Question

17. Give two methods of preparation of dioxygen(O2) and chemical reaction of Oz with SO2, NH, and
HCI.
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Answer 1

Heating of potassium chlorate and mercuric oxide forms dioxygen.

Step by step explanation:

Preparation methods of dioxygen:

i)

In the presence of Manganese oxide,  potassium chlorate undergoes catalytic decay to form dioxygen.

The chemical reaction is as follows.

$2KClO_{3}\underset{MnO_{2}}{\rightarrow}2KCl+3O_{2}$

ii)

Disintegration of metal oxides like mercuric oxide and silver oxide form dioxygen.

The chemical reaction is as follows.

$2HgO\rightarrow 2Hg+O_{2}$

Reaction with $SO_{2}$

In the presence of vanadium pentoxide dioxygen reacts with sulfur oxide to form sulfur trioxide .

$2SO_{2}+O_{2}\rightarrow 2SO_{3}$

Reaction with $NH_{3}$

Dioxygen reacts with ammonia to form nitrogen and water.

$4NH_{3}+3O_{2}\rightarrow 2N_{2}+6H_{2}O$

Reaction with HCl:

Dioxygen reacts with HCl to form water and chlorine.

$4HCl+O_{2}\rightarrow 2H_{2}O+2Cl_{2}$

Answer 2

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