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  • Topic:

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0.5 g of fuming H2SO4 (oleum) is diluted  with water. This solution is completely neutralised by 26.7 mL of 0.4 N NaOH. The percentage of free SO3 in the sample is:

(a) 30.6% 

(b) 40.6%

(c) 20.6%

(d) 50%