The major constituent of air is_____ A Oxygen B Carbon dioxide C Hydrogen D Nitrogen The major constituent of air is_____ Correct Answer Nitrogen Air is made up of 78% N2, 21% O2, Others 1%. Bissoy MCQ Team May 27, 2023 সাধারণ জ্ঞান United Commercial Bank Ltd (UCB) United Commercial Bank Ltd - Trainee Officer - 12.09.2014