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Q.

20 volumes H2O2 solution has a strength of about

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a

30%

b

6%

c

3%

d

10%

answer is B.

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Detailed Solution

∵  22.4  litres  O2  atN.T.P.  obtained  by68  g  ofH2O2

∵ 1  litre  O2  atN.T.P.  obtained  by6822.4  g  ofH2O2

 20  litre  O2  atN.T.P.  obtained  by6822.4× 20   g  ofH2O2 = 60.71 g of H2O2

1000 ml  O2  atN.T.P.  obtained  by 60.71   g  ofH2O2 = 60.71 g of H2O2

100ml  O2  atN.T.P.  obtained  by =60.711000× 100  = 6.71%

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