Futa Education

*Chem101 likely questions and answers* 
1. Electron was discovered by___________. 1. Chadwick 2. Thomson 3. Goldstein 4. Bohr Answer: 2
2. An atom has a mass number of 23 and atomic number 11. The number of protons are_________. 1.
11 2. 12 3. 23 4. 44 Answer: 1
3. The mass of the atom is determined by________. 1. neutrons 2. neutron and proton 3. electron 4.
electron and neutron Answer: 2
4. The K, L and M shells of an atom are full. Its atomic number is_______. 1. 18 2. 20 3. 10 4. 12
Answer: 1
5. Which of the air pressures is appropriate for the production of cathode rays in the discharge tube? 1.
1 cm Hg 2. 1 mm Hg 3. 0.001 cm Hg 4. 0.001 mm Hg Answer: 4
6. Cathode rays are deflected towards__________. 1. positive electrode 2. negative electrode 3. both
electrodes 4. none of the electrodes Answer: 1
7. The absolute charge of an electron is___________. 1. - 1.6 x 10-19C 2. + 1.6 x 10-19C 3. 1.6 x 10-19C
4. 16 x 10-19C
Answer: 1
8. The proton is heavier than an electron by___________. 1. 1850 times 2. 1840 times 3. 1000 times 4.
100 times Answer: 2
9. Carbon-12 atom has_______________. 1. 6 electrons, 6 protons, 6 neutrons 2. 6 electrons, 12
protons, 6 neutrons 3. 12 electrons, 6 protons, 6 neutrons 4. 18 electrons, 6 protons and 6 neutrons
Answer: 1
10. Chadwick got the Nobel Prize for the discovery of __________. 1. protons 2. neutrons 3. electrons 4.
mesons Answer: 2
11. Mass number is equal to the_________. 1. number of protons + number of electrons 2. number of
protons + number of neutrons 3. number of neutrons + number of electrons 4. number of electrons
Answer: 2
12. The element X has 2 valence electrons. It is a____________. 1. metal 2. non-metal 3. metalloid 4. gas
Answer: 1
13. The volume of the nucleus of an atom when compared to the extra nuclear part is_________. 1.
bigger 2. smaller 3. same size 4. unpredictable Answer: 2
14. In Rutherford's alpha-scattering experiment, a foil of element that was used ___________. 1. gold 2.
silver 3. aluminum 4. magnesium Answer: 1
15. An element has an electronic configuration of 2, 8, 7. Its valency is 1. 1 2. 7 3. 17 4. 8 Answer: 1
16. The other name of is _________ 1. protium 2. tritium 3. deuterium 4. proton Answer: 1
17. During a chemical reaction, atomic number_________. 1. changes 2. remains same 3. changes and
then is restored 4. changes alternately Answer: 2
18. The fixed circular paths around the nucleus are called_________. 1. orbits 2. orbitals 3. nucleons 4.
mesons Answer: 1