Question

An element burns in air to form an oxide. The aqueous solution of this oxide turns turmeric paper red. State whether the element is a metal or nonmetal. Name one such element.

Answer 1

Metal, Magnesium

Explanation:

When the magnesium metal burns it reacts with oxygen found in the air to form Magnesium Oxide. An aqueous solution of magnesium oxide turns turmeric paper red. So Magnesium is the element. It is a metal. So it forms a basic oxide with oxygen. Turmeric turns red when it reacts with a base. Since MgO is a base, it turns turmeric red.

2Mg + O2 --->  2MgO