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

Which of the following is paramagnetic?

• CO

• N₂

• O₂

• H₂O₂

Which of the following has sp³ -hybridisation?

• BCl₃

• PCl₃

• BeCl₃

• None of these

Among the following compounds which is planar in shape is

• acetylene

• benzene

• isobutene

• methane

The number of σ bonds in P₄O₁₀ is:

• 6

• 16

• 7

• 17