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* Subjective Type Question
\( \mathrm{P} \)
W
When \( 2 \mathrm{~g} \) of a gas \( A \) is introduced into an evacuated flask kept at \( 25^{\circ} \mathrm{C} \), the pressure is found to be one atmosphere. If \( 3 \mathrm{~g} \) of another gas \( B \) is then added to the same flask, the total pressure becomes \( 1.5 \mathrm{~atm} \). Assuming ideal gas behaviour, calculate the ratio of the molecular weights \( M_{A}: M_{B} \).
\( (1983,2 M) \)
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