Quiz for Group 15–18 elements

Q1: Which of the following oxides of nitrogen is a neutral oxide?

A. NO B. N₂O₃ C. NO₂ D. N₂O₅

Q2: Which element forms the maximum number of oxoacids?

A. Phosphorus B. Nitrogen C. Sulfur D. Chlorine

Q3: Ozone is an allotropic form of which element?

A. Oxygen B. Nitrogen C. Fluorine D. Sulfur

Q4: Which of the following is the most stable allotrope of phosphorus?

A. White phosphorus B. Red phosphorus C. Black phosphorus D. Violet phosphorus

Q5: Which noble gas has the lowest boiling point?

A. He B. Ne C. Ar D. Kr

Q6: The acidic strength of oxides of nitrogen increases in the order:

A. NO < N₂O < NO₂ B. N₂O < NO < NO₂ C. NO₂ < NO < N₂O D. NO < NO₂ < N₂O

Q7: Noble gases are chemically inert because:

A. They are nonmetals B. Their outer shell is complete C. They are monatomic D. They have low reactivity

Q8: Which halogen does not form oxyacids?

A. Fluorine B. Chlorine C. Bromine D. Iodine

Q9: Which of the following is used in nuclear reactors as a moderator?

A. Helium B. Neon C. Krypton D. Heavy water