I can also confirm that Χρώμα is the only correct answer.

Χρώμα is the only correct answer. κολορα isn't a word at all. It simply doesn't exist. P.S. Never use this word, because it reminds Greek people of a vulgar word.

Χρώμα is the correct answer!

Google Chrome = το Χρώμα της Γκουγκλ ποιο είναι το χρώμα της Γκουγκλ;