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Q.

245 gram of KClO3 on decomposition produce 2.4 gram of O2 .What is % purity of KClO3?

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a

2.5 %

b

4 %

c

5 %

d

7 %

answer is A.

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Detailed Solution

Gram molecular weight of KClO3=39+35.5+48=122.5 gram/mole 

2KClO32KCl+3O2

According to equation 245 gram of KClO3 should produce 3×32=96 gram of O2 if KClO3 is 100 % pure.

96 gm of O2 is produced when KClO3 is 100 percent pure.

When 2.4 gm of O2 is produced , the percentage purity is 10096×2.4 = 2.5

 

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