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Choose the correct statement from the following.
(i) Beryllium is not readly attacked by acids because of the presence of an oxide film on the surface of the metal.
(ii) $\mathrm{BeO}$ is an amphoteric oxide.
(iii) Beryllium exhibits coordination number more than four.
(iv) Beryllium oxide is purely acidic in nature.
Options:
(i) Beryllium is not readly attacked by acids because of the presence of an oxide film on the surface of the metal.
(ii) $\mathrm{BeO}$ is an amphoteric oxide.
(iii) Beryllium exhibits coordination number more than four.
(iv) Beryllium oxide is purely acidic in nature.
Solution:
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Verified Answer
The correct answer is:
(i)
Be is not readily attacked by acids due to formation of oxide layer. The surface of beryllium metal is covered with a thin layer of oxide that helps protect the metal from attack by air. It does not oxidise in air even at $600^{\circ} \mathrm{C}$.
$$
2 \mathrm{Be}+\mathrm{O}_2 \longrightarrow 2 \mathrm{BeO}
$$
Hence, statement (a) is correct.
$$
2 \mathrm{Be}+\mathrm{O}_2 \longrightarrow 2 \mathrm{BeO}
$$
Hence, statement (a) is correct.
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