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Which sample of matter is a mixture?
(1) Br2(ℓ) (3) KBr(s)
(2) K(s) (4) KBr(aq)

User Gogol
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The correct answer is option 4. KBr(aq) is an example of a mixture. The symbol (aq) means that the substance is in aqueous form. Thus, potassium bromide is dissolved in water. Mixture is defined as a system which contains two or more substances mixed but not combined chemically. The two substances here are KBr and water.
User Lekksi
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