Question

Select from the following a statement which is not true about the burning of magnesium ribbon in air:

• A. It burns with a dazzling white flame.
• B. A white powder is formed on burning.
• C. It is an endothermic reaction.
• D. It is an example of a combination reaction.
  {5pt}

Hint:

The burning of magnesium in air is a combination reaction (Mg + Osubscript{2} → MgO) and it releases heat, making it exothermic.

Answer 1

The Correct Option is C

Step 1: Understanding the burning of magnesium ribbon. 
- When magnesium ribbon burns in air, it produces a dazzling white flame and forms a white powder of magnesium oxide (MgO), which is an exothermic reaction. 
- The reaction between magnesium and oxygen is a combination reaction where two reactants combine to form a product. 
Step 2: Conclusion. The burning of magnesium is an exothermic reaction, not endothermic. 
Therefore, statement (C) is incorrect.