Here's the correct answer for the incongruent test:
John Ridley Stroop first reported this effect in his Ph.D. thesis published in 1935, commonly known as "Stroop Effect
When the meaning of a word and its color are congruent, such as the word "BLUE" written in blue color, it is easy to recognize the actual color of the word
But when the meaning of the word is incongruent with the color, such as "BLUE" written in red color, it creates a conflict between the color and the word's meaning.
The "conflict" between two brain processes are word-recognition and color-recognition.This conflict requires extra processing time for the brain to resolve.