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  • Which reaction is laboratory method for the preparation of oxygen gas?Option: 1 <img alt="\mathrm{Ag _{2} O \stackrel{\Delta}{\rightarrow} 2 Ag +\fra

Which reaction is laboratory method for the preparation of oxygen gas?

Option: 1

\mathrm{Ag _{2} O \stackrel{\Delta}{\rightarrow} 2 Ag +\frac{1}{2} O _{2}}


Option: 2

\mathrm{2 HgO \stackrel{\Delta}{\longrightarrow} 2 Hg + O _{2}}


Option: 3

\mathrm{3 M n O_{2} \stackrel{\Delta}{\longrightarrow} M n_{3} O_{4}+O_{2}}


Option: 4

\mathrm{2 KClO _{3} \stackrel{\Delta}{\rightarrow} 2 KCl +3 O _{2}}


Answers (1)

best_answer

As we have learnt,

Preparation of dioxygen by laboratory method -

\mathrm{2 KClO_3 \xrightarrow[MnO_{2}]{420K}2KCl+3O_{2}}

Therefore, option (4) is correct.

Posted by

HARSH KANKARIA

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