7. 1 g of oleum sample is diluted w...
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7. 1 g of oleum sample is diluted with water. The solution required 54 mL of 0.4M NaOH for complete neutralization. The % of free SO, in the sample is : (A) 74 (B) 26 (C) 20 (D) None of these

JEE/Engineering Exams
Chemistry
Solution
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( left.ln m operatorname{ig}left(H_{2} sec A+operatorname{sog}right) rightarrow n_{2} s_{2} 0right] ) Since So is uxidp. acidic in radure id reacts midh MaON ( 2 mathrm{NaOh}+mathrm{SO}_{3} longrightarrow mathrm{Na}_{2} mathrm{SO}_{4}+mathrm{H}_{2} mathrm{O} ) Let ( g m beta ) of 50 3 in ( 19 m=x ) ( g m ) of ( n_{2} 104=(1-x) ) At neutraliza rion ste je meg of sample = Mequrnaon ( =left[frac{x}{E sin x}+frac{1-x}{E}right]_{n=504}^{k log 0} 20 cdot 4 x 54 ) ( =left[frac{x}{80}+frac{1-x}{frac{98}{2}}right] times 1000=0.4 times 54 ) ( x=0.2595= ) rrass 08.503 ( cdot int cdot Delta r sin 3=frac{0 cdot 2595}{1} times 100 ) ( =25 cdot 95 cdot 1 )
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