Ace the SDSU Chemistry Placement Test 2025 – Ignite Your Science Success!

Question: 1 / 400

What gas is produced when an acid reacts with a metal?

Carbon dioxide

Oxygen

Nitrogen

Hydrogen gas

When an acid reacts with a metal, hydrogen gas is typically produced. This reaction occurs because acids contain hydrogen ions (H⁺), and when they come into contact with certain metals, the hydrogen ions are reduced to hydrogen gas (H₂). The general reaction can be represented as:

\[ \text{Acid} + \text{Metal} \rightarrow \text{Salt} + \text{Hydrogen gas} \]

For example, when hydrochloric acid (HCl) reacts with zinc (Zn), hydrogen gas is liberated:

\[ \text{Zn} + 2\text{HCl} \rightarrow \text{ZnCl}_2 + \text{H}_2 \uparrow \]

The formation of hydrogen gas is characteristic of reactions between many common acids and reactive metals. In contrast, the other gases listed do not typically result from such reactions. Carbon dioxide may arise from reactions involving carbonates with acids, whereas oxygen is generally produced in reactions involving oxidation, and nitrogen gas is not commonly a product of reactions between acids and metals.

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