261.

The calculated bond order of superoxide ion ${\mathrm{O}}_2^{-} \mathrm{is}$

• 2.5

• 2

• 1.5

• 1

In the ionic equation

-BiO${}_3^{-}$ + 6H⁺ + xe^- → Bi³⁺ + 3H₂O , the value of x is

• 6

• 2

• 4

• 3

Mesomeric effect involves delocalisation of

• pi electrons

• sigma electron

• protons

• None of these

Angle strain in cyclopropane is

• 24°44'

• 9°44'

• 44'

• -5°16'

The number of antibonding electron pairs in O${}_2^{2-}$ molecular ion on the basis of molecular orbital theory is (Atomic number of O is 18)

• 5

• 4

• 3

• 2

Maximum number of molecules of CH₃I that can react with a molecule of CH₃NH₂ are

• 3

• 4

• 2

• 1

An octahedral complex is formed when hybrid orbitals of the following type are involved

• sp³

• dsp²

• d²sp³

• sp²d²

The angle strain in cyclobutane is

• 24°44'

• 29°16'

• 19°22'

• 9°44'

The correct statement with regard to ${\mathrm{H}}_2^{+} \mathrm{and} {\mathrm{H}}_2^{-}$ is

• both ${\mathrm{H}}_2^{+} \mathrm{and} {\mathrm{H}}_2^{-}$ are equally stable

• both ${\mathrm{H}}_2^{+} \mathrm{and} {\mathrm{H}}_2^{-}$ do not exist

• H${}_2^{-}$ is more stable than H${}_2^{+}$

• H${}_2^{+}$ is more stable than H${}_2^{-}$

Arrange the following in the increasing order of their bond order

O₂, O${}_2^{+} , {\mathrm{O}}_2^{-} \mathrm{and} {\mathrm{O}}_2^{2-}$

• ${\mathrm{O}}_2^{2-}, {\mathrm{O}}_2^{-}, {\mathrm{O}}_2, {\mathrm{O}}_2^{+}$

• ${\mathrm{O}}_2^{2-}, {\mathrm{O}}_2^{-}, {\mathrm{O}}_2^{+}, {\mathrm{O}}_2$

• ${\mathrm{O}}_2^{+}, {\mathrm{O}}_2, {\mathrm{O}}_2^{-}, {\mathrm{O}}_2^{2-}$

• ${\mathrm{O}}_2, {\mathrm{O}}_2^{+}, {\mathrm{O}}_2^{-}, {\mathrm{O}}_2^{2-}$