Structure of Atom
9th chemistry chapter 2 solved exercise MCQs
- Which one of the following results in the discovery of proton ?
(a) cathode rays
(b) canal rays 🗸
(c) X-rays
(d) alpha rays
2. Which one of the following is the most penetrating ?
(a) protons
(b) electrons
(c) neutrons 🗸
(d) alpha particles
3. The concept of orbit was used by :
(a) J.J Thomson
(b) Rutherford
(c) Bohr 🗸
(d) Plank
4. which one of the following shell consists of three subshells ?
(a) O shell
(b) N shell
(c) L shell
(d) M shell 🗸
5. Which radioisotope is used for the diagnosis of tumor in the body ?
(a) cobalt-60
(b) iodine-131 🗸
(c) strontium-90
(d) phosphorus-32
6. When U-235 breaks up , it produces :
(a) electrons
(b) neutrons 🗸
(c) protons
(d) nothing
7. The p-subshell has :
(a) one orbital
(b) two orbital
(c) three orbital 🗸
(d) four orbital
8. Deuterium is used to make :
(a) light water
(b) heavy water 🗸
(c) soft water
(d) hard water
9. The isotope C-12 is present in abundance of :
(a) 96.9 %
(b) 97.6 %
(c) 99.7 %
(d) none of these 🗸
10. Who discovered the proton ?
(a) Goldstein 🗸
(b) J.J. Thomson
(c) Neil Bohr
(d) Rutherford
9th Chemistry, Chapter 2, Structure of Atom , Solved exercise short questions , free notes