A metal X is used in making foil for wrapping food. The oxide of metal X reacts with both hydrochloric acid and sodium hydroxide to produce salt and water. Identify the metal X.

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Solution

From the given options, aluminium is often used to make foil for wrapping food.
Also, the oxide of metal X reacts with both hydrochloric acid (an acid) and sodium hydroxide (a base). Metal oxides which react with both acids as well as bases to produce salts and water are known as amphoteric oxides.

The reaction of aluminium oxide with hydrochloric acid and sodium hydroxide can be represented as:
${Al}_{2} O_{3} (s) + 2 NaOH (aq) \to 2 {NaAlO}_{2} (aq) + H_{2} O (l) {Al}_{2} O_{3} (s) + 6 HCl (aq) \to 2 {AlCl}_{3} (aq) + 3 H_{2} O (l)$

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