Why is Qxg4 a blunder?

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Avatar of chessboy1563
(This is actually a real game that I played with someone)

Avatar of Alramech
chessboy1563 wrote:
(This is actually a real game that I played with someone)

1...Qxg4 2.Bxg4+ Kb8 g7! [and Black loses the rook]

Avatar of ErynnBass08
The queen is not in a bad position