Once you have spent some time on chords ear training you should be able recognise major, minor, augmented and diminished triads by ear.

A useful next step is to work on recognising the different inversions of each chord.

Recap: What is an inversion?

An inversion of a chord simply means arranging the notes of a chord in a different order. For example, with a triad chord you have the 1, 3 and 5 notes of the scale and the 1 is lowest in pitch, 3 in the middle and 5 highest. In its first inversion you would move the 1 note up to the top (one whole octave higher) so that it is still the same note – but now in a higher register than the 3 and the 5. So the 3 note is now the lowest, the 5 in the middle, and the 1 on top.

How to recognise chord inversions