Not really. White keys are only "proper notes" in the scale of C major (or Am); in other scales, notes can fall on black keys, modulated by white keys; and also

Not really. White keys are only "proper notes" in the scale of C major (or Am); in other scales, notes can fall on black keys, modulated by white keys; and also, the modulation is sometimes above and sometimes below the note, depending on the scale, something that the keyboard doesn't emphasize or make visible in any way.