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Question

MnO2+2KClO3K2MnO4+Cl2+2O2
Cl2+K2MnO42KCl+MnO2+O2
Each reaction takes place to the extent of 50 %.

11.2 L of O2 at STP is obtained from KClO3 using?

A
0.66 mol
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B
1.12 mol
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C
1.33 mol
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D
2.66 mol
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Solution

The correct option is A 0.66 mol
MnO2+2KClO3K2MnO4+Cl2+2O2(1)

Cl2+K2MnO42KCl+MnO2+O2(2)

At STP 11.2L of O2=11.222.4 mole of O2=0.5 mole
Reactions 1 and 2 give two mole and one mole of O2 respectively.

Reaction 1 gives 23×0.5=0.33 mole of O2.

Again each reaction takes place to the extent of 50%.

Number of moles of KClO3=0.330.5=0.66 mol

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