Mrs. Rushing fills a balloon with hydrogen gas to demonstrate its ability to burn. Which combination could she use to produce the hydrogen she needs? NaOH and oil Zn and KOH H_(2)SO_(4) and CaCO_(3) Mg and HCl

This question is asking which combination of substances can produce hydrogen gas when reacted together. 1. (sodium hydroxide) and oil: This combination does not produce hydrogen gas. Sodium hydroxide is a strong base and oil is a nonpolar substance. They do not react to produce hydrogen gas.2. (zinc) and (potassium hydroxide): This combination does not produce hydrogen gas. Zinc reacts with strong bases like potassium hydroxide to produce zincates, not hydrogen gas.3. (sulfuric acid) and (calcium carbonate): This combination does not produce hydrogen gas. When sulfuric acid reacts with calcium carbonate, it produces calcium sulfate, water, and carbon dioxide gas, not hydrogen gas.4. (magnesium) and (hydrochloric acid): This combination does produce hydrogen gas. When magnesium reacts with hydrochloric acid, it produces magnesium chloride and hydrogen gas. The reaction is as follows: .Therefore, the combination that Mrs. Rushing could use to produce the hydrogen she needs is magnesium and hydrochloric acid.