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For mixture of two ideal gases, total pressure = (Dalton's law):
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BSum of partial pressures P_total = P₁ + P₂
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Answer & Solution
Correct answer: B. Sum of partial pressures P_total = P₁ + P₂
Dalton's law of partial pressures: each gas behaves independently. P_total = ΣP_i. Holds for ideal mixtures (negligible intermolecular interactions). Each partial pressure: P_i = n_i RT/V.
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