1st Year Chemistry 1st Quarter Book Paper

Q1. Multiple choice questions (Attempt all · 12 × 1 = 12)

1. London dispersion forces increase with:

   1. Decreasing molar mass

   2. Increasing polarity

   3. Increasing molecular size

   4. Decreasing temperature

2. Which one of the following elements has the highest ionization energy?

   1. Sodium (Na)

   2. Magnesium (Mg)

   3. Aluminium (Al)

   4. Argon (Ar)

3. True about theoretical yield is:

   1. It is always less than actual yield

   2. It is always equal to actual yield

   3. It is always greater than actual yield

   4. It may be equal or less than actual yield

4. Element is typically used to dope silicon to create a p-type semiconductor:

   1. Group 1 element

   2. Group 14 element

   3. Group 13 element

   4. Group 15 element

5. In VSEPR, lone pair-lone pair repulsion is:

   1. Stronger than bond pair-bond pair

   2. Equal to bond pair-bond pair

   3. Weaker than bond pair-lone pair

   4. Absent

6. Which property increases as you go down a group in the periodic table?

   1. Atomic radius

   2. Electron Affinity

   3. Electronegativity

   4. Ionization energy

7. Which of the following gases will occupy the same volume at STP if the masses are equal?

   1. O₂ and Cl₂

   2. CO₂ and N₂

   3. He and Ar

   4. All will differ

8. Ionization energy for

   1. 738 kJ mol^-1

   2. 448 kJmol^-1

   3. 238 kJmol^-1

   4. 138 kJmol^-1

9. Species has the highest bond order is:

   1. O₂

   2. O₂⁺

   3. O₂

   4. O₂^2-

10. Which set of the following conditions results in higher ionization energy?

    1. Smaller atom and greater nuclear charge

    2. Smaller atom and smaller nuclear charge

    3. Larger atom and greater nuclear charge

    4. Larger atom and the smaller nuclear charge

11. Equation of water formation is given as: moles of hydrogen involve:

    1. 0.5

    2. 1.0

    3. 1.5

    4. 2.0

12. Incorrect orders with respect to relative energy is:

    1. 2s < 2p

    2. 2p < 3s

    3. 3p < 3d

    4. 4d < 3s