Two acids $A$ and $B$ are titrated separately. $25 \ mL$ of $0.5 \ M \ Na_2CO_3$ solution requires $10 \ mL$ of $A$ and $40 \ mL$ of $B$ for complete neutralization. The volumes (in $L$) of $A$ and $B$ required to produce $1 \ L$ of $1 \ N$ acid solution respectively are:

  • A
    $0.2, 0.8$
  • B
    $0.8, 0.2$
  • C
    $0.3, 0.7$
  • D
    $0.7, 0.3$

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In the titration of $Na_2CO_3$ with $HCl$ using phenolphthalein as an indicator,what will be the result?

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