Be and Al exhibit diagonal relationship. Which of the following statement/s about them is/are false?
1. Both react with HCl to liberate $H_{2}$
2. They are made passive by $H N O_{3}$
3. Their carbides give acetylene on treatment with water.
4. Their oxides are amphoteric.

3 and 4

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1 and 2

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1 only

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3 only

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Solution

The correct option is D
3 only

The carbides of both Be and Al liberate methane on treatment with water.
$B e_{2} C + 2 H_{2} O \to 2 B e O + C H_{4}$

$A l_{4} C_{3} + 6 H_{2} O \to 2 A l_{2} O_{3} + 3 C H_{4}$

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