Question

8. Which of the following are considered pure substance:

(a) Both elements and compounds

(b) Neither elements nor compounds

(c) Elements

(d) Compounds​

Answer 1

$\huge \colorbox{cyan}{pure \: substance}$

⬇️⤵️

$\huge{ \red{ \bold{ \underline{ \overline{ \green{elements}}}}}}$

➡️an element is a pure substance which cannot be broken down by chemical means, consisting of atoms which have identical numbers of protons in their atomic nuclei.

Answer 2

Of the following (a) Both elements and compounds are considered pure substance:

• Those substances which have a constant composition and proportion are called as Pure substances. Both elements and compounds are called as Pure substances.
• Elements are made of only one type of atoms. They cannot be separated by physical methods hence, they are regarded as pure substances.
• Similarly, the formation of compounds is done in a fixed ratio and constant proportion. They can only be broken down by special chemical methods.
• Hence, both elements and compounds are pure substances.