Which of the following is experimental evidence of a chemical reaction? (a) Pouring vinegar on baking soda

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Which of the following is experimental evidence of a chemical reaction?

(a) Pouring vinegar on baking soda gives foamy bubbles.

(b) Mixing two solutions produces insoluble particles.

(c) Mixing two colorless solutions gives a yellow solution.

(d) Mixing two solutions produces a temperature increase.

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