Which one of the following has the regular tetrahedral structure?
(Atomic nos : B = 5, S = 16, Ni = 28, Xe = 54)

The bond order in NO is 2.5 while that in NO⁺ is 3. Which of the following statements is true for these two species?

The states of hybridization of boron and oxygen atoms in boric acid (H₃BO₃) are respectively

The graph of the function y = f(x) is symmetrical about the line x = 2, then