Which substance has the greatest ionic character?

• Cl₂O

• NCl₃

• PbCl₂

• BaCl₂

Favourable conditions for the formation of electrovalent bond is that the cation and anion must have, respectively

• high ionisation potential and low electron affinity

• low ionisation potential and high electron affinity

• high ionisation potential and high electron affinity

• low ionisation potential and low electron affinity

Consider the formal charges on N and B in H₃N-BF₃ and indicate which of the following is true?

• N is +ve and B is -ve

• N is --ve and B is +ve

• both N and B carry similar +ve or -ve charges

• charge discrimination is difficult to make

Consider (i) CO₂ (ii) CCl₄ (iii) C₆Cl₆ and (iv) CO and tell which of the following statements is correct?

• (i), (ii) and (iii) only have zero dipole moment

• (i), (ii) and (iv) only have zero dipole moment

• only (iv) has zero dipole moment

• All have zero dipole moment

Intermolecular hydrogen bonding is strongest in

• HCHO

• CH₃OH

• C₆H₅OH

• CH₃NH₂

Which one of the following represents the correct state of hybridisation of P in PCl₅ ?

• s⁰p³

• sp³d

• s²p³

• sp²d²

Aluminium chloride exists as dimer, Al₂Cl₆, in solid state as well as in solution of non-polar solvents such as benzene. When dissolved in water, it gives

• Al³⁺ + 3Cl^-

• [Al(H₂O₆]³⁺ + Cl^-

• [Al(HO)₆]^3- + 3HCl

• Al₂O₃ + 6HCl

Where of the ${\mathrm{O}}_2^{-}, {\mathrm{O}}_2^{2-},$ BN and NN is/are paramagnetic ?

• NN

• ${\mathrm{O}}_2^{2-}$

• BN

• ${\mathrm{O}}_2^{-}$

Which of the following is not true?

• In a first order reaction, the half-life is independent to the initial concentration of reactant.

• A given piece of charcoal shows increase in its surface area in its powdered form.

• In valence bond of H₂, each electron spends its time around its own nucleus

• In valence bond of H₂, both the electrons spend their time around both the nucleus

The correct order of decreasing dipole moment of (I) toluene, (II) m-dichlorobenzene (III) o-dichlorobenzene and (IV) p-dichlorobenzene is

• IV < II < I < III

• IV < I < II < III

• I < IV < II < III

• IV < I < III < II