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QUESTION
Q67) 0.115 g of pure sodium metal was dissolved in 500 mL distilled water. The normality of the solution would be [ Na=23] .. [ CPMT 1992]




SOLUTION

Na + H2O → NaOH + ½ H2
Thus 23 g Na gives 40g NaOH
∴ 0.115 Na gives 0.2 g of NaOH
20 g of NaOH in 500 ml solution=1 N
∴ 0.2 g of NaOH in 500 solution=0.01N Answer: (a)