Question

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$\huge{\blue{\star}}\sf{ \green{Question\:(1)}}$, refer to attachment.
$\rule{400}{2}$ $\huge{\blue{\star}}\sf{ \green{Question\:(2)}}$
A student titrated a mixture of $\sf{NaHCO_3,}$ and $\sf{Na_2 CO_3,}$ against a standard solution of $\sf{HCl.}$ He pipetted out a certain volume of mixture and added phenolphthalein indicator. The pink solution changed to colouriess after addition of $\sf{x}$ ml of $\sf{HCI.}$ To the same solution he added methyl orange indicator and continued the titration. The end point with methyl orange indicator was obtained after addition of $\sf{y}$ ml $\sf{HCI.}$ The volume of $\sf{HCl}$ requited for complete neutralization of $\sf{Na_2 CO_3}$ is :-
$\tt{(a)} \sf{2x}$
$\tt{(b)} \sf{\dfrac{x}{2}}$
$\tt{(c)} \sf{y}$
$\tt{(d)} \sf{y - x}$​

Answer 1

2.x/2..................................