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The s-block Elements — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryThe s-block Elements2 Marks
Question
An element of group 2 forms covalent oxide which is amphoteric in nature and dissolves in water to give an amphoteric hydroxide. Identify the element and write chemical reactions of the hydroxide of the element with an alkali and an acid.
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Answer

In group 2, Be is the element which gives covalent oxide BeO, which is amphoteric in nature. The rest elements of this group give ionic oxides which are basic in nature. BeO dissolves in water and gives sparingly soluble hydroxide which reacts with acid and base to give salt.
$\text{BeO}+\text{H}_2\text{O}\xrightarrow{\ \ \ }\text{Be}\text{(OH)}_2$
$\text{Be(OH)}_2+2\text{OH}^-\xrightarrow{\ \ \ }[\text{Be(OH)}_4]^{2-}\\\text{Beryllate ion}$
$\text{Be(OH)}_2+2\text{HCl}+2\text{H}_2\text{O}\xrightarrow{\ \ \ }[\text{Be}(\text{OH})_4]\text{Cl}_2$

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