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 = 3, m = +1, 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

• 16 and 4

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

• Li⁺

• F^-

• O^2-

• O^2-

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

• 406 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

• NH₃ < H₂S < SiH₄ < BF₃

Which one the following sets of ions represents the collection of isoelectronic species?

• K⁺ , Ca²⁺, Sc³⁺, Cl^-

• Na⁺ , Mg²⁺, Al³⁺, Cl^-

• K⁺ , Cl^- , Mg²⁺, Sc³⁺

• K⁺ , Cl^- , Mg²⁺, Sc³⁺

Among Al₂O₃, SiO₂, P₂O₃ and SO₂ the correct order of acid strength is

• SO₂ < P₂O₃ < SiO₂ < Al₂O₃

• Al₂O₃ < SiO₂ < P₂O₃ < SO₂

• Al₂O₃ < SiO₂ < SO₂ < P₂O₃

• Al₂O₃ < SiO₂ < SO₂ < P₂O₃

8.

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?

• Bond length in NO⁺ is greater than in NO

• Bond length is unpredictable

• Bond length in NO⁺ in equal to that in NO

• Bond length in NO⁺ in equal to that in NO

The formation of the oxide ion O^2-(g) requires first an exothermic and then an endothermic step as shown below

• Oxygen is more electronegative

• O^- ion has comparatively larger size than oxygen atom

• O^- ion will tend to resist the addition of another electron

• O^- ion will tend to resist the addition of another electron

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

• sp² and sp²

• sp³ and sp³

• sp³ and sp²

• sp³ and sp²