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Chemical Bonding and Molecular Structure

Multiple Choice Questions

261.

The calculated bond order of superoxide ion $O_{2}^{-} is$

262.

In the ionic equation

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

263.

Mesomeric effect involves delocalisation of

pi electrons
sigma electron
protons
None of these

264.

Angle strain in cyclopropane is

24°44'
9°44'
44'
-5°16'

265.

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)

266.

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

267.

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

sp³
dsp²
d²sp³
sp²d²

268.

The angle strain in cyclobutane is

24°44'
29°16'
19°22'
9°44'

269.
The correct statement with regard to $H_{2}^{+} and H_{2}^{-}$ is

both $H_{2}^{+} and H_{2}^{-}$ are equally stable

both $H_{2}^{+} and H_{2}^{-}$ do not exist

H $_{2}^{-}$ is more stable than H $_{2}^{+}$

H $_{2}^{+}$ is more stable than H $_{2}^{-}$

H $_{2}^{+}$ is more stable than H $_{2}^{-}$

Among the given statements, statement d is the correct.

The bond order of H $_{2}^{+}$ and H $_{2}^{-}$ are same, i.e. $\frac{1}{2}$ but H $_{2}^{+}$ is more stable than H $_{2}^{-}$ . It is due to the presence of one electron in the antibonding molecular orbital in H $_{2}^{-}$ .

270.

Arrange the following in the increasing order of their bond order

O₂, O $_{2}^{+}, O_{2}^{-} and O_{2}^{2 -}$

$O_{2}^{2 -}, O_{2}^{-}, O_{2}, O_{2}^{+}$
$O_{2}^{2 -}, O_{2}^{-}, O_{2}^{+}, O_{2}$
$O_{2}^{+}, O_{2}, O_{2}^{-}, O_{2}^{2 -}$
$O_{2}, O_{2}^{+}, O_{2}^{-}, O_{2}^{2 -}$

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Multiple Choice Questions

269. The correct statement with regard to H2+ and H2- is both H2+ and H2- are equally stable both H2+ and H2- do not exist H2- is more stable than H2+ H2+ is more stable than H2-

269.
The correct statement with regard to $H_{2}^{+} and H_{2}^{-}$ is

both $H_{2}^{+} and H_{2}^{-}$ are equally stable

both $H_{2}^{+} and H_{2}^{-}$ do not exist

H $_{2}^{-}$ is more stable than H $_{2}^{+}$

H $_{2}^{+}$ is more stable than H $_{2}^{-}$