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1. Some basic concept of chemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry1. Some basic concept of chemistry1 Mark
MCQ
If $1\, mole$ of $H_3PO_x$ is completely neutralized by $80 \,gm$ of $NaOH$, select the correct statement :-
  • A
    $x = 2$ and acid is monobasic
  • ✓
    $x = 3$ and acid is dibasic
  • C
    $x = 4$ and acid is tribasic
  • D
    All are correct
✓

Answer

Correct option: B.
$x = 3$ and acid is dibasic
b
$\mathrm{Eqv} .$ of $\mathrm{H}_{3} \mathrm{PO}_{\mathrm{x}}=\mathrm{Eqv} .$ of $\mathrm{NaOH}$

$1$ mole $\times$ Basicity $=\frac{80 \,\mathrm{gm}}{\left(\mathrm{E}_{\mathrm{NaOH}}=40\right)}$

$\text { Basicity }=2\left(\mathrm{H}_{3} \mathrm{PO}_{\mathrm{x}}=\mathrm{H}_{3} \mathrm{PO}_{3}\right)$

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