471.

The dipole moment of HBr is 2.60 x 10^-30 Cm and the interatomic spacing is 1.41 $\stackrel{\circ }{\mathrm{A}}$ .The percent ionic character of HBr is:

• 11.5%

• 10.1%

• 8.2%

• 4.1%

Which of the following gives correct arrangement of compounds involved based on their bond strength ?

• HF > HCl > HBr > HI

• HI > HBr > HCl > HF

• HF > HBr > HCl > HI

• HCl > HF > HBr > HI

H-bond is strongest in

• C₂H₅OH

• H-F

• H₂O

• CH₃COCH₃

Hybridization of 1 and 2 carbon atom in

$\stackrel{1}{\mathrm{C}}$H₂ = $\stackrel{2}{\mathrm{C}}$ = CH₂ are

• sp, sp

• sp², sp²

• sp², sp

• sp³, sp²

The hybridisation and shape of IF₅ are respectively:

• sp³d , trigonal bipyramide

• sp³d , see saw

• sp³d , square pyramidal

• sp³d , pentagonal pyramidal

Number of orbitals in L energy level

• 1

• 2

• 3

• 4

Assuming that Hund's rule in violated,the bond order and magnetic nature of the  diatomic molecule B₂ is:

• 1 and diamagnetic

• 0 and diamagnetic

• 1 and paramagnetic

• O and paramagnetic

Using MO theory, predict which of the following species has the shortest bond length?

• ${\mathrm{O}}_2^{2+}$

• ${\mathrm{O}}_2^{+}$

• ${\mathrm{O}}_2^{-}$

• ${\mathrm{O}}_2^{2-}$

The shape of an orbital is determined by

• n

• l

• m

• s

The enthalpies of all elements in their standard states are

• zero

• >0

• <0

• unity