The correct order of bond length is

• b > a > c > d

• a > b > c > d

• d > c > b > a

• c > d > b > a

Consider the following ions:

(i) Ni²⁺   (ii) Co²⁺  (iii) Cr²⁺   (iv) Fe³⁺

(Given, at. no. Cr = 24, Fe = 26, Co = 27, Ni = 28)

The correct order of magnetic moment of these ions is

• (i) < (ii) < (iii) < (iv)

• (iv) < (ii) < (iii) < (i)

• (i) < (iii) < (ii) < (iv)

• (iii) < (iv) < (ii) < (i)

333.

Geometry of methyl free radical is

• pyramidal

• planar

• tetrahedral

• linear

The electron configuration of the oxide ion is much most similar to the electron configuration of the

• sulphide ion

• nitride ion

• oxygen atom

• nitrogen atom

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