1.

It is customary to indicate the strength of a sample of H_2O_2under specification of volume. The strength of H_2O_2solution can also be in %(w/v) or molarity or normality. 10 vol H_2O_2 solution means Iml of H_2O_2solution decomposes to give 10ml of O_2gas at STP. 1 lit of H_2O_2solution decomposes to give 10 lit of O_2gas at STP.The volume of 20V-H_2O_2solution, required to prepare 5 litres of oxygen at S.T.P is

Answer»

125ML
250 ML
100 ml
50ml

Solution :`X xx20 = 5000, x = 250 ml`


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