Q. Which of the following elements can't be detected by direct tests?
A) N
B) O
C) S
D) Br
Explanation
(b)
Oxygen cannot be detected by direct test because oxygen is present in atmosphere and all tests are carried in atmosphere of oxygen
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.