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Chemical Bonding and Molecular Structure

Multiple Choice Questions

711.

Which of the following has sp²-hybridisation?

C₂H₆
C₂H₄
BeCl₂
C₂H₂

712.

An sp³-hybrid orbital contains

$\frac{1}{4} s - character$
$\frac{1}{2} s - character$
$\frac{2}{3} s - character$
$\frac{3}{4} s - character$

713.

Hybridisation states of C in CH $_{3}^{+}$ and C $H_{3}^{-}$ are

sp², sp³
sp³, sp²
sp, sp²
sp², sp

714.

Which one of the following complexes is outer orbital complex?

[Co(NH₃)₆]³⁺
[Mn(CN)₆]⁴⁺
[Fe(CN)₆]^4-
[Ni(NH₃)₆]²⁺

715.

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 $_{2}^{-}$

716.
The number of electrons, neutrons and protons in a species are equal to 10, 8 and 8 respectively. The proper symbol of the species is

${}_{8}^{16}O$

${}_{8}^{18}O$

${}_{10}^{18}{Ne}$

${}_{8}^{16}O^{2 -}$

${}_{8}^{16}O^{2 -}$

From the given data, the atomic number, Z or number of protons of the species is 8. Number of neutrons is also 8, hence atomic mass is 16. Since, the number of electrons are two more than the number ofprotons, hence it is a bi-negative species. Thus, the species is ${}_{8}^{16}O^{2 -}$