Answer these questions selecting the appropriate option given below:

Assertion : Magnesium reacts with oxygen upon heating and burns brightly to form magnesium oxide.

Reason: Magnesium oxide is basic in nature.

Both A and R are true but R is not the correct explanation of A.

The correct answer is option 2. Both A and R are true but R is not the correct explanation of A.

Assertion (A): Magnesium reacts with oxygen upon heating and burns brightly to form magnesium oxide. This statement is true. Magnesium is a highly reactive metal and readily forms magnesium oxide when exposed to oxygen, especially at high temperatures.

Reason (R): Magnesium oxide is basic in nature. This statement is also true. Magnesium oxide is an ionic compound composed of magnesium ions (Mg²⁺) and oxide ions (O²⁻). It is a basic oxide because it reacts with water to form a base (magnesium hydroxide) and has properties characteristic of bases.

While both the assertion and reason are true, the reason provided does not directly explain why magnesium reacts with oxygen to form magnesium oxide. The reaction of magnesium with oxygen is a chemical process, whereas the basic nature of magnesium oxide is a property of the resulting compound. Therefore, option "Both A and R are true but R is not the correct explanation of A" is the most appropriate.