1st Year Chemistry Chapter 2 Test02. Atomic Structure

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. Semi-conductors possess electrical conductivity:
   1. Equal to metals
   2. Higher than metals
   3. Equal to insulators
   4. Between conductors and insulators
2. The element magnesium belongs to which group based on successive ionization energies?
   1. Group 1
   2. Group 2
   3. Group 3
   4. Group 7
3. The region in space where the probability of finding an electron is maximum is called:
   1. Shell
   2. Orbital
   3. Subshell
   4. Energy level
4. Atomic radius decreases across a period due to:
   1. Decrease in nuclear charge
   2. Increase in shielding
   3. Increase in number of shells
   4. Increase in nuclear charge
5. The magnetic quantum number for d-orbital has values from:
   1. -1 to +1
   2. -2 to +2
   3. -3 to +3
   4. -4 to +4
6. Sodium has a characteristic:
   1. Blue emission line
   2. Red emission line
   3. Yellow emission line
   4. Green emission line
7. Intrinsic semiconductors are:
   1. Doped with impurities
   2. Pure materials like silicon or germanium
   3. Made of metals
   4. Made of insulators
8. A negative ion (anion) has:
   1. Deficit of electrons
   2. Equal electrons and protons
   3. Extra protons
   4. Excess of electrons
9. Extrinsic semiconductors are formed by:
   1. Heating
   2. Adding impurities
   3. Cooling
   4. Removing electrons
10. When silicon is doped with boron, it becomes:
    1. p-type semiconductor
    2. n-type semiconductor
    3. insulator
    4. conductor