Q. Which of the following statements is true:
(a)Melting point of Phosphorous is less than that of Nitrogen
(b)N2 is highly reactive while P4 is inert
(c)Nitrogen shows higher tendency of catenation than P
(d)N-N is weaker than P-P
Answer: (d)N-N is weaker than P-P
other statements as incorrect as Phosphorus has a higher melting point due to bigger size than Nitrogen. Nitrogen is inert due to formation of triple bonds and has a lower covalence due to non – availability of d –orbitals