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6.2. Equilibrium - II (icon Equilibrium) — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry6.2. Equilibrium - II (icon Equilibrium)1 Mark
MCQ
The most acidic compound in water is
  • A
    $AlC{l_3}$
  • B
    $BeC{l_2}$
  • ✓
    $FeC{l_3}$
  • D
    None of these
✓

Answer

Correct option: C.
$FeC{l_3}$
c
Among the given compounds, ferric chloride $\left( FeCl _3\right)$ is most acidic. This is due to higher effective nuclear charge of $Fe ^{3+}$ ion. As the effective nuclear charge increases, the acid character also increases.

In all of these compounds, the aqueous solution on hydrolysis liberates $HCl$ gas.

$BeCl _2+2 H _2 O \rightarrow Be ( OH )_2+2 HCl \uparrow$

$AlCl _3+3 H _2 O \rightarrow Al ( OH )_3+3 HCl \uparrow$

$FeCl _3+3 H _2 O \rightarrow Fe ( OH )_3+3 HCl \uparrow$

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