Jamb Chemistry Past Questions For Year 2021
Question 11
A sample of any of the following substances disappears after some time when exposed to air like camphor, naphthalene, or dry ice. This phenomenon is called?
- A. Sublimation
- B. Evaporation
- C. Diffusion
- D. Radiation
Question 13
The gas which causes global warming is?
- A. O\(_{2}\)
- B. CO\(_{2}\)
- C. N\(_{2}\)
- D. He
Question 15
The mass number of a nucleus is?
- A. Always less than its atomic number
- B. The sum of the number of protons and neutrons present in the nucleus
- C. Always more than the atomic weight
- D. A fraction
