First slide

Alkaline earth metals

Question

Select the incorrect statement.

Moderate

A

NaOH can be stored in a vessel made of Al
B

HNO₃ can be stored in a vessel made of Be/Al alloy
C

HF can be stored in a vessel made of wax
D

HF attacks glass

Solution

(1) Al reacts with NaOH thus Al-vessel cannot be used to store NaOH.
(2) HNO₃ makes Be-Al passive. Thus, it can be used to store HNO₃.
(3) HF does not react with wax, thus stored in the vessel made of wax.
(4) HF attack CaSiO₃,
$\begin{aligned} {CaSiO}_{3} + 6 HF ⟶ {CaSiF}_{6} + 3 H_{2} O \\ {Na}_{2} {SiO}_{3} + 6 HF ⟶ {Na}_{2} {SiF}_{6} + 3 H_{2} O \end{aligned}$

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