Q. Which of the following statements regarding phosphorus are correct?

1. White phosphorus is highly toxic and exhibits chemiluminescence.
2. Red phosphorus is stable and commonly used in matchstick heads.
3. Black phosphorus is a good electrical conductor.

Select the correct answer using the codes given below:
Answer: 1, 2 & 3
Notes: White phosphorus is highly toxic and glows in the dark due to chemiluminescence. Red phosphorus is stable and widely used in the heads of safety matches. Black phosphorus is the most stable allotrope and is a good electrical conductor. Therefore, all three statements are correct.