NEET UG 2015 — Chemistry Inorganic Chemistry

2015mcqmedium

In which of the following pairs, both the species are not isostructural?

Official previous-year question

Held on 30 Apr 2015 · Verified 9 Jul 2026.

Options

A
$SiC{l}_{4}, {PCl}_{4}^{+}$
B
Diamond, silicon carbide
C
$N{H}_{3}, P{H}_{3}$
D
$Xe{F}_{4}, Xe{O}_{4}$

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Solution

i. Hybridization of $N{H}_{3} [\sigma =3, lp=1]$

$s{p}^{3}$ geometry : Tetrahedral

NEET 2015 Chemistry, Chemical Bonding and Molecular Structure — solution figure 1

ii. Structures of $Xe{F}_{4}$ is square planar.

NEET 2015 Chemistry, Chemical Bonding and Molecular Structure — solution figure 2

Structure of $Xe{O}_{4}$ is tetrahedral

NEET 2015 Chemistry, Chemical Bonding and Molecular Structure — solution figure 3

So $Xe{F}_{4}$ and $Xe{O}_{4}$ are not isostructural.

iii. Structure of $SiC{l}_{4}$ is tetrahedral.

NEET 2015 Chemistry, Chemical Bonding and Molecular Structure — solution figure 4

Structure of ${PCl}_{4}^{+}$ is tetrahedral.

NEET 2015 Chemistry, Chemical Bonding and Molecular Structure — solution figure 5

iv. Diamond and SiC both are isostructural because both have tetrahedral arrangement and central atom is $s{p}^{3}$ hybridized.

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Solution

i. Hybridization of $N{H}_{3} [\sigma =3, lp=1]$

$s{p}^{3}$ geometry : Tetrahedral

NEET 2015 Chemistry, Chemical Bonding and Molecular Structure — solution figure 1

ii. Structures of $Xe{F}_{4}$ is square planar.

NEET 2015 Chemistry, Chemical Bonding and Molecular Structure — solution figure 2

Structure of $Xe{O}_{4}$ is tetrahedral

NEET 2015 Chemistry, Chemical Bonding and Molecular Structure — solution figure 3

So $Xe{F}_{4}$ and $Xe{O}_{4}$ are not isostructural.

iii. Structure of $SiC{l}_{4}$ is tetrahedral.

NEET 2015 Chemistry, Chemical Bonding and Molecular Structure — solution figure 4

Structure of ${PCl}_{4}^{+}$ is tetrahedral.

NEET 2015 Chemistry, Chemical Bonding and Molecular Structure — solution figure 5

iv. Diamond and SiC both are isostructural because both have tetrahedral arrangement and central atom is $s{p}^{3}$ hybridized.

NEET UG 2015 — Chemistry Inorganic Chemistry

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NEET UG 2015 — Chemistry Inorganic Chemistry

Options

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Solution

Your note

NEET UG Inorganic Chemistry in other years

More NEET UG Inorganic Chemistry questions

Other Chemistry topics for NEET UG

Physical Chemistry

Organic Chemistry

Keep practicing Inorganic Chemistry