Highly selective Backlog Qs for JEE MainChemistrySome Basic Concepts of Chemistry

1.25 ~g of a sample of Na ₂ CO ₃ and Na ₂ SO ₄ is dissolved in 250 ml solution. 25 ml of this solution neutralises 20 ml of 0.1 ~N H ₂ SO ₄ . The % of Na ₂ CO ₃ in this sample is

Options

A84.8 %
B8.48 %
C15.2 %
D42.4 %

Correct answer

A. 84.8 %

Step-by-step solution

Let the amount of Na ₂ CO ₃ present in the mixture be xg . Na ₂ SO ₄ will not react with H ₂ SO ₄ . Then x 53 = 20 0.1 10 1000 x=1.06 g Percentage of Na ₂ CO ₃= 1.06 100 1.25 =84.8 %

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