Answer:
As \[PV=nRT\] \[\therefore \] \[{{n}_{B}}=\frac{PV}{RT}\]and \[{{n}_{A}}=\frac{2P.2V}{R.2T}=2\frac{PV}{RT}\]and \[{{n}_{A}}:{{n}_{B}}=\mathbf{2:1}\]
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