Which gas is produced when lithium reacts with water?

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Multiple Choice

Which gas is produced when lithium reacts with water?

Explanation:
This question tests what gas is produced when lithium reacts with water. When lithium, an alkali metal, meets water, it donates electrons to the water, forming lithium hydroxide and releasing hydrogen gas. The reaction is 2 Li + 2 H2O → 2 LiOH + H2, so the gas you see bubbling is hydrogen. The other gases listed aren’t produced in this reaction: oxygen would come from splitting water in a different process, nitrogen isn’t involved here, and carbon dioxide would require carbon-containing reactants. So the gas produced is hydrogen.

This question tests what gas is produced when lithium reacts with water. When lithium, an alkali metal, meets water, it donates electrons to the water, forming lithium hydroxide and releasing hydrogen gas. The reaction is 2 Li + 2 H2O → 2 LiOH + H2, so the gas you see bubbling is hydrogen. The other gases listed aren’t produced in this reaction: oxygen would come from splitting water in a different process, nitrogen isn’t involved here, and carbon dioxide would require carbon-containing reactants. So the gas produced is hydrogen.

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