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⁺

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

707.

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

• Carbon

• Nitrogen

• Phosphorus

• Boron

Which one ofthe following statements about C₂ molecule is wrong?

• The bond order of C₂ is 2.

• In vapour phase, C₂ molecule is diamagnetic.

• Double bond in C₂ molecule consists of both $\mathrm{\pi }$- bonds because of the presence of 4${\mathrm{e}}_{\mathrm{s}}^{-}$ in two $\mathrm{\pi }$- molecular orbitals.

• double bond in C₂ molecule consists of one $\sigma$- bond and on $\mathrm{\pi }$-bond.

The type of hybridisation in SF₆, molecule is

• sp³d

• dsp³

• sp³d

• d²sp³

Among LiCl, BeCl₂, BCl₃ and CCl₄ the covalent bond character follows the order

• LiCl < BeCl₂ < BCl₃ < CCl₄

• BCl₃ < CCl₄ < BeCl₂ < LiCl

• BeCl₂ < LiCl < CCl₄ < BCl₃

• CCl₄ < BCl₃ < BeCl₂ < LiCl