1.

1.25 g of a sample of \[N{{a}_{2}}C{{O}_{3}}\] and \[NaS{{O}_{4}}\] is dissolved in 250 ml solution. 25 ml of this solution neutralises 20 ml of 0. 1 N\[{{H}_{2}}S{{O}_{4}}\]. The % of \[N{{a}_{2}}{{O}_{2}}\] in this sample is

A. 84.8%              
B. 0.0848
C. 15.2%              
D. 0.424
Answer» B. 0.0848


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