Question

Which of the following statements is/are correct? (a) All the constituent particles of a pure substance are the same in their chemical nature. (b) A pure substance consists of a single type of particles. (c) Most of the matter around us exist as mixtures of two or more pure compounds. (d) All of these​

Answer 1

Answer:

A pure substance contains only one type of particles which can either be atoms or molecules or elements or compounds having same chemical nature. Most of the matter around us exist as mixtures of two or more pure components, for example, sea water, minerals, soil etc. are all mixtures. Thus, option \((d)\) is correct.

Answer 2

The correct option is- (d) All of these.

• Pure substances are homogeneous in nature in which one kind of particle is present. Hence, the chemical nature of all constituent particles is the same in pure substances.
• They can be atoms, molecules or compounds. Examples include- aluminium, water, nitrogen etc.
• Most of the substances that surround us are made up of two or more pure substances. For example- air is a mixture of many pure gases such as oxygen, carbon dioxide etc.