Question

Which one of the following is not a mixture?
A.Distilled water
B. Sugar dissolved in water
C. Liquefied Petroleum Gas (LPG)
D. Gasoline

Answer 1

Hint: In chemistry, when two or more substances mix with one another without participating in a very natural process, the resulting substance is termed a mixture.

Complete answer:
The result formed as a combination of substances doesn't lose its individuality nor are they combined chemically. Mixtures are the product which is formed of a mechanical blending or mixing of chemical substances like compounds and elements, be it simple or complex.
Mixtures are generally made up of two or more substances that aren't chemically combined with one another. The properties of mixtures are listed below.
Each and every component of a mixture keeps their original properties.
The separation of components is easily done.
The proportion of the components is variable.
There are two main kinds of mixtures: homogeneous mixtures and heterogeneous mixtures. The kinds of mixtures are discussed below.
1. What's a Heterogeneous Mixture?
A mixture of salt added with sand is an example of a heterogeneous mixture. Heterogeneous mixtures possess different compositions and properties throughout various parts i.e. the properties don't seem to be uniform throughout the mixture.
Examples of Heterogeneous mixtures are – air, oil, and water, etc.
2. What's a Homogeneous Mixture?
Sugar mixed with water is the commonest example of a homogeneous mixture. Homogeneous mixtures will be defined because the mixtures which possess the identical properties and combinations throughout their mass.
Examples of Homogeneous mixtures are – alloys, salt, and water, alcohol in water, etc.
Now from the above options only distilled water is in pure form and not composed of any other substances.

So it is not a mixture . So A is the correct option.

Note: Some Examples of Mixtures are:
Crude oil: a combination of organic compounds (mainly hydrocarbons)
Seawater: a mix of assorted salt and water.
Air: a combination of assorted gases like oxygen, dioxide, nitrogen, argon, neon, etc.
Ink: a combination of colored dyes.
Gunpowder: a combination of sulfur, nitrate and carbon.