10 speed chainrings with otherwise 12 speed drivetrain

[bikinchris]

The space INSIDE the chain links is identical on 10 to 12 speed. The chain is narrower outside. The chainring itself will hold the chain and not cause trouble. However, the spacing between rings is not the same and it is possible that the chain can get caught between chainrings.
Single speed chains have inner width of 1/8″ (3.175 mm).
Multi speed chains, from 5 to 8 have inner width of 3/32″ (2.38 mm).
Multi speed chains from 9 to 12 speeds have inner width of 11/128″ (2.18 mm).