Which of the following is considered a pure substance?

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A Milk
B Iron
C Air
D Salad

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Answer: B. Iron

Correct Answer: B) Iron
Explanation: In chemistry, a pure substance consists of only one type of particle (atoms or molecules) and has a fixed chemical composition. Iron is an element and cannot be broken down into simpler substances. Milk, air, and salads are all mixtures of various substances.

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Which of the following is considered a pure substance?

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