Question

Which of the statement is true about pure substances
a) Homogeneous mixtures are pure as they have the same composition throughout
b) 22-carat gold is pure in nature.
c) Elements are not pure in nature.
d) Gold and carbon dioxide both are pure in nature

Answer 1

The correct statement about pure substances is- d) Gold and carbon dioxide both are pure in nature.

• The substances that are made up of only a single type of particle are called pure substances. Atoms, molecules, elements and compounds are pure substances found in nature. We cannot separate pure substances by any means as they consist of one type of particle.
• Gold, water, carbon dioxide, iron etc. are examples of pure substances.
• A mixture is not a pure substance as it is formed due to the addition of two or more substances. It can be separated by physical methods.
• Homogeneous mixtures are not pure substances. We can separate them by physical methods.
• 22- carat gold is not a pure substance, it is a mixture as it contains copper also.

Answer 2

Answer:

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Explanation:

A) Which of the statement is true about pure substances

1. Homogeneous mixtures are pure as they have same composition throughout.

2. 22 carat goldis pure in nature.

3. Elements are not pure in nature.

4. Gold and carbon dioxide both are pure in nature.