Question

which of the following has a fixed shape iron ,oxygen, milk, CO2​

Answer 1

Explanation:

which of the following has a fixed shape

iron

Answer 2

Iron has a fixed shape.

• There are four substances mentioned in the question :

1. Iron
2. Oxygen
3. Milk
4. CO2

• We know that, liquids and gases have no definite shapes.
• Only a solid substance has a definite shape. The intermolecular spaces in a solid substance is extremely negligible and the molecules are closely packed. That's why molecules of a solid substance cannot move from their original positions (they can vibrate only) and the shape is being retained. (strong intermolecular attraction forces acts as a key factor here)
• Now, among the given substances, oxygen and CO2 are gases ; milk is liquid. So, none of them have a definite shape.
• Only iron is a solid substance here. So, only iron will have a definite shape.