Question : The ionisation energy of nitrogen is greater than that of oxygen because nitrogen has:

Option 1: high bond dissociation energy

Option 2: smaller atomic radius

Option 3: half-filled P-orbitals

Option 4: high nuclear charge

Question : Which of the following elements has the lowest melting point?

Option 1: Sodium

Option 2: Tin

Option 3: Radon

Option 4: Radium

Question : Which of the following pairs of "elements - valency" is correct?
I. Boron - 2
II. Fluorine - 3

Option 1: Neither I nor II

Option 2: Both I and II

Option 3: Only II

Option 4: Only I

Question : Which one of the following elements is an example of noble gas?

Option 1: Nitrogen

Option 2: Hydrogen

Option 3: Chlorine

Option 4: Helium

Question : Which one of the following elements is associated with teeth disorder?

Option 1: Chlorine

Option 2: Fluorine

Option 3: Bromine

Option 4: Iodine