I want to compose a song in the C major scale. The chords in that scale are:

C Dm Em F G Am Bdim

If I use say a Gm chord instead of a G major does my song still stay in the C major scale?

How do I play the B diminished chord? I need the fret numbers or a chord diagram.
If you use a Gm, it isn't in C major anymore, but it can be F major if you don't use the Em and Bdim, but you can also use Bb and Edim.

x2343x would be Bdim.
no, Gm means that there is a Bb, which there isn't.

B diminished looks like this:
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The song can still be in C major, but it won't be completely diatonic.
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