A. Carbon, hydrogen
B. Carbon, hydrogen, nitrogen
C. Carbon, nitrogen and sulphur
D. Carbon, hydrogen, nitrogen
Correct Answer: Carbon, hydrogen ✔
Last Updated: March 29, 2019
A. Carbon, hydrogen
B. Carbon, hydrogen, nitrogen
C. Carbon, nitrogen and sulphur
D. Carbon, hydrogen, nitrogen
Correct Answer: Carbon, hydrogen ✔
Last Updated: March 29, 2019