Consider the following structures

Choose the correct statement regarding the above structures.

• Dipole moment varies as II > III > I

• II is more stable than I

• I is the most reactive among three

• All of the above

The correct order of magnitude of bond angles among the compounds CH₄, NH₃ and H₂O is

• CH₄ > H₂O < NH₃

• H₂O < NH₃ < CH₄

• NH₃ < CH₄ < H₂O

• NH₃ < H₂O < CH₄

The angular shape of ozone molecule (O₃) consists of

• 1 sigma and 2 pi bonds

• 2 sigma and 2 pi bonds

• 1 sigma and 1 pi bonds

• 2 sigma and 1 pi bonds

Among the following the molecule possessing highest dipole moment is

• CO₂

• BF₃

• SO₂

• Trans-2-butene

The standard enthalpies of formation of A(NH₃), B(CO₂), C(HI) and D(SO₂) are - 46.19, -393.4, +24.94 and -296.9 kJ mol1 respectively. The increasing order of their
stability is 

• B < D < A < C

• C < A < D < B

• D < B < C < A

• A < C < D < B

The charge/size ratio of a cation determines its polarising power. Which one of the following sequences represents the increasing order of the polarising power of the cationic species, K⁺, Ca²⁺, Mg²⁺, Be²⁺?

• K⁺ < Ca²⁺ < Mg²⁺ < Be²⁺

• Be²⁺ < K²⁺ < Ca²⁺ < Mg²⁺

• Mg²⁺< Be²⁺ < K⁺ < Ca²⁺

• Ca²⁺ < Mg²⁺ < Be⁺ < K⁺

57.

The correct order of basic strength of the following are

• I > II > IV > III

• IV > III > II > I

• II > III > IV I

• III > IV > II > I

In the complexes [Fe(H₂O)₆]³⁺ , [Fe(CN)₆]^3-, [Fe(C₂O₄)₃]^3- and [FeCl₆]^3-, more stability is

• [FeCl₆]^3-

• [Fe(C₂O₄)₃]^3-

• [Fe(H₂O)₆]³⁺

• [Fe(CN)₆]^3-

Which of the following represents the correct order of decreasing number of S = O bonds?

• H₂SO₄ > H₂SO₃ > H₂S₂O₈

• H₂S₂O₈ > H₂SO₃ > H₂SO₄

• H₂S₂O₈ > H₂SO₄ > H₂SO₃

• H₂SO₃ > H₂S₂O₈ > H₂SO₄

Which of the following elements can be involved in $\mathrm{p\pi } - \mathrm{d\pi }$ bonding?

• Carbon

• Nitrogen

• Phosphorus

• Boron