When 2g of a gas A is introduced into an...

When 2g of a gas A is introduced into an evacuated flask kept at 25°C, the pressure is found to be 1 atmosphere. If 3g of another gas is then added to the same flask, the total pressure becomes 1.5 atm. Assuming ideal behaviour, the ratio of their molecular weights `M_(A): M_(B)` is

`3:1`

`1:3 `

`2:3 `

`3:2`

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