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Using the Chord Chart (the scale keys are listed according
to the Circle of Fifths diagram), you can see that the Triad
chord for the key of C has all white keys. The 1st
note is C, the 3rd note is E and the 5th
note is G. All of these notes are played on white keys.
The Triad chord for B has 2 black keys. (Remember that the
key of B has 5 sharps.) The 1st note B is a
white key, the 3rd note (D♯)
is a black key, and the 5th note (F♯)
is a black key.

  
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