​Which of the following products is formed when calcium carbonate is heated?​

Correct option is C

The correct answer is (c) Quick lime.

Here's why:

• Calcium carbonate (CaCO3), when heated strongly, undergoes thermal decomposition.  

This reaction breaks down calcium carbonate into two products:

• Calcium oxide (CaO), also known as quicklime.  
• Carbon dioxide (CO2), a gas.  
  

The chemical equation for this reaction is:

• CaCO3 (s) → CaO (s) + CO2 (g)  

Let's look at why the other options are incorrect:

• Limestone: Limestone is primarily composed of calcium carbonate. It's the starting material, not the product of heating.  
• Slaked lime: Slaked lime is calcium hydroxide (Ca(OH)2), formed when quicklime (CaO) reacts with water.  
• Marble: Marble is a metamorphic rock that is primarily composed of calcium carbonate. It's a different form of the starting material.
• Therefore, the product formed when calcium carbonate is heated is quick lime (CaO).