What is always produced when a metal reacts with an acid?, A. Oxygen, B. Hydrogen , C. Carbon dioxide, D. Nitrogen, What type of reaction is magnesium + hydrochloric acid?, A. Endothermic, B. Exothermic , C. Neutral, D. Combustion, What is the salt formed when magnesium reacts with hydrochloric acid?, A. Magnesium sulfate, B. Magnesium nitrate, C. Magnesium chloride , D. Magnesium oxide, Which observation shows a reaction is happening?, A. Freezing, B. Colour disappears, C. Fizzing (bubbles) , D. No change.

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