Sodium is an element, Sugar is a compound, Nitrogen is a diatomic element and Air is a mixture.
So, correct option is (B) Sugar.
What is Compound ?
A compound refers to a pure substance that is composed of two or more different elements in definite proportions by weight which breaks into simpler elements is known as compound. A compound has fixed formula.
Now check all the options one by one:
Option (A): Sodium is an element not a compound because it is made up of one kind of atom only. It cannot be split into any other substance.
So option A is incorrect
Option (B): Sugar is a compound due to its fixed composition. Sugar is composed when two or more different elements are joined together.
So option B is correct.
Option (C): Nitrogen is a diatomic element because it is made up of 2 nitrogen atoms which are chemically bonded.
So option C is incorrect.
Option (D): Air is a mixture it is not a compound. Air contains oxygen, nitrogen, argon and other gases. It does not have a fixed formula. It shows the property of all gases which are present in it. Air has no formula.
So option D is incorrect.
Thus, from above conclusion we can say that Sodium is an element, Sugar is a compound, Nitrogen is a diatomic element and Air is a mixture.
Hence, Option B is correct answer.
Learn more about Compounds here: https://brainly.com/question/26487468
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