The most acidic compound in water is

MCQ

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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