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AP Exams AP Chemistry Chemical Reactions Easy Practice Question

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Shortcut used: Balance atoms and charge first, then apply mole ratios, solubility rules, or electron transfer as required.

Solve in 3 steps:

Mark the given values and the exact target.
Apply the relevant formula, rule, or concept.
Check the final value against the options.

Common mistake: Do not choose an option before confirming the exact demand of the question.

Question 5 Multiple Choice Question

Question

For 2H2+O2→2H2O, a mixture contains 4.0 mol H2 and 3.0 mol O2. Which reactant is limiting?

Explanation

Correct Answer: A

ANSWER

Correct Answer: A

Method / Topic: Chemical Reactions

Four moles of H2 require only two moles of O2. Because three moles O2 are available, H2 is consumed first.

Why this answer is correct

The correct option matches the required rule and the given information.

Short Explanation

Four moles of H2 require only two moles of O2. Because three moles O2 are available, H2 is consumed first.

Detailed Explanation

Question

For 2H2+O2→2H2O, a mixture contains 4.0 mol H2 and 3.0 mol O2. Which reactant is limiting?

ANSWER

Correct Answer: A

Method / Topic: Chemical Reactions

Four moles of H2 require only two moles of O2. Because three moles O2 are available, H2 is consumed first.

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Question 5

Easy Marks: 1.0 Practice Question

Free access limit is ending soon

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View Plans

Learn + Solve: Shortcut, Trap & Fast Route Click to view shortcut, steps, and common mistake

Shortcut used: Balance atoms and charge first, then apply mole ratios, solubility rules, or electron transfer as required.

Solve in 3 steps:

Mark the given values and the exact target.
Apply the relevant formula, rule, or concept.
Check the final value against the options.

Common mistake: Do not choose an option before confirming the exact demand of the question.

Question

For 2H2+O2→2H2O, a mixture contains 4.0 mol H2 and 3.0 mol O2. Which reactant is limiting?

Explanation

Correct Answer: A

ANSWER

Correct Answer: A

Method / Topic: Chemical Reactions

Four moles of H2 require only two moles of O2. Because three moles O2 are available, H2 is consumed first.

Why this answer is correct

The correct option matches the required rule and the given information.

Short Explanation

Four moles of H2 require only two moles of O2. Because three moles O2 are available, H2 is consumed first.

Detailed Explanation

Question

For 2H2+O2→2H2O, a mixture contains 4.0 mol H2 and 3.0 mol O2. Which reactant is limiting?

ANSWER

Correct Answer: A

Method / Topic: Chemical Reactions

Four moles of H2 require only two moles of O2. Because three moles O2 are available, H2 is consumed first.

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Balance atoms and charge first then apply mole ratios solubility rules or electron transfer as required.

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