Question

Which of the following is homogeneous?

1. Ice
2. Wood
3. Soil
4. Air

Answer 1

When two or more different substances form a material but are not chemically combined. It is a physical combination of two or more substances in which the substances are mixed in the form of suspension, solutions, and colloids but the identities of substances are retained, it is known as a mixture.

Complete step by step solution:
Homogeneous mixture- The components that are mixed in a mixture are uniformly distributed in the mixture. They are uniform throughout, they are known as a homogeneous mixture. Only one phase of matter is observed in a homogeneous mixture. Some things to remember about these kinds of mixtures are
Here, the particles in the mixture are distributed throughout.
We cannot recognize a homogeneous mixture by looking at it.
They are also known as solutions.
They have uniform composition.
Some examples are rainwater, vinegar, etc.
Ice has a similar composition to that of a water molecule. So, ice is a homogeneous mixture.
Wood has cells, the cell walls contain microfibrils of cellulose whose percentage range is 40 $$ to 50 $$, and it has hemicellulose whose percentage range is 15 $$ to 25 $$ infused with lignin whose percentage range is 15 $$ to 30 $$ which makes it a heterogeneous mixture.
Soil is composed of various substances like pebbles, plant matter, and sand, but these substances don’t dissolve and remain separated when put together in a mixture. So, sand is a heterogeneous mixture.
Air comprises various gaseous substances like Nitrogen - 78 $$, Oxygen - 20.9 $$, Other gases - 0.17 $$, Argon - 0.90 $$ and Carbon dioxide - 0.03 $$ which makes it a homogeneous mixture.
So, Option 1) and 4) are correct, i.e ice and water are a homogeneous mixture.
Note: The other type of mixture is a Heterogeneous mixture. The components in the mixture are completely mixed and the substances can be seen under a microscope, it is known as a heterogeneous mixture. The substances are easily recognized and there is not a single phase, there is more than one phase that is visible to the naked eyes.