Broken chords in different keys

In E-flat and in all other chords having two black keys, the thumb comes on the angle white one. These chords may, however, be played with the thumb on the black key.

Another exercise about broken chords

The following exercises are designed to accustom the finger to the greater degree of extension.

Other major | diminished broken chords

Here are other helpful exercises about major and diminished broken chords.