Which of the following is a compound and not a mixture?
Water
The explanation for the correct answer- (A) Water
Water is a compound due to the following reasons:
Compound - It is a pure substance made by a chemical reaction of two or more different elements in a fixed proportion.
The explanation for the incorrect answer-
(B) Milk - It consists of fats, proteins and vitamins mixed in water, hence it is a mixture.
(C) Lemonade - It consists of lemon juice, salt and sugar, hence it is a mixture.
(D) Protein shake - It is a mixture of various proteins and milk.
Mixture - when two or more substances are mixed physically in any variable proportion in such a way that they retain their individual properties is called a mixture.
Hence, option (A) is correct. Water is a compound and not a mixture.