Which of these is not a mixture? a) baking soda b) salt and water c) iron filings and sand d) metal paper clips and plastic paper clips

Baking Soda

Explanation:

Baking soda is not a mixture but a chemically bonded compound which is a result of the reaction between Sodium and the carbonate anion with the following chemical formula .In a mixture there are no fixed proportions of the substances involved and the substances keep their physical properties and with most mixtures the substance can be separated from each other mechanically.However a mixture of salt and water is known as a homogeneous mixture meaning the salt can no longer be seen separate in the solution but uniformly dissolves in the water.

i think the answer would be d

gag reflex, poor dentition, gum retraction

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