Which of the following sets of quantum numbers is correct for an electron in 4f orbital?

• n = 4, I =3, m = +4, s = + 1/ 2

• n = 3, I = 2, m = -2, S = + 1/2

• n =4, I = 3, m = +1, s = + 1/ 2

• n =4, I = 4, m -4, s = -1/ 2

Consider the ground state of Cr atom (Z = 24). The number of electrons with the azimuthal quantum numbers I =1 and 2 are respectively

• 12 and 4

• 16 and 5

• 16 and 4

• 12 and 5

Which one the following ions has the highest value of ionic radius?

• Li⁺

• F^-

• O^2-

• B³⁺

The wavelength of the radiation emitted, when in hydrogen atom electron falls from infinity to stationary state 1, would be (Rydberg constant = 1.097×10⁷ m^-1)

• 91 nm

• 9.1×10^-8 nm

• 406 nm

• 192 nm

A.

91 nm

The correct order of bond angles (smallest first) in H₂S, NH₃, BF₃ and SiH₄ is

• H₂S < SiH₄ < NH₃ < BF₃

• H₂S < NH₃ < BF₃ < SiH₄

• NH₃ < H₂S < SiH₄ < BF₃

• H₂S < NH₃ < SiH₄ < BF₃