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Which of the following species absorb maximum energy in its HOMO-LUMO electronic transition?
$1. {\mathrm{O}}_2$
$2. {\mathrm{N}}_2^{-}$
$3. {\mathrm{C}}_2$
$4. {\mathrm{N}}_2$
 

In which of the following transformations, the bond order has increased and the magnetic behavior has changed?
$1. {\mathrm{C}}_2^{+} \to {\mathrm{C}}_2$
$2. {\mathrm{NO}}^{+}\to \mathrm{NO}$
$3. {\mathrm{O}}_2 \to {\mathrm{O}}_2^{+}$
$4. {\mathrm{N}}_2 \to {\mathrm{N}}_2^{+}$

The correct order of Cl-O bond order is
$1. {\mathrm{ClO}}_3^{-} < {\mathrm{ClO}}_4^{-} < {\mathrm{ClO}}_2^{-} < {\mathrm{ClO}}^{-}$
$2. {\mathrm{ClO}}^{-} < {\mathrm{ClO}}_4^{-} < {\mathrm{ClO}}_3^{-} < {\mathrm{ClO}}_2^{-}$
$3. {\mathrm{ClO}}^{-} < {\mathrm{ClO}}_2^{-} < {\mathrm{ClO}}_3^{-}< {\mathrm{ClO}}_4^{-}$
$4. {\mathrm{ClO}}_4^{-} < {\mathrm{ClO}}_3^{-} < {\mathrm{ClO}}_2^{-} < {\mathrm{ClO}}^{-}$

The shape of ${\mathrm{XeF}}_3^{+}$ is :
1. Trigonal planar
2. Pyramidal
3. Bent T-shape
4. See-saw

The correct statement regarding $S{O}_2$ molecule is:
1. two $p\mathrm{\pi }-\mathrm{d\pi }$ bonds
2. molecules has 2 lone pair, 2$\sigma$ bonds and 2$\pi$ bonds
3. two $p\pi -p\pi$ bonds
4. one $p\pi -p\pi$ and one $p\mathrm{\pi }-\mathrm{d\pi }$ bond
 

The correct order of increasing bond angles in t
he following species is
1.  ${\mathrm{Cl}}_2\mathrm{O} < {\mathrm{ClO}}_2 < {\mathrm{ClO}}_2^{-}$
2.  ${\mathrm{ClO}}_2 < {\mathrm{Cl}}_2\mathrm{O} < {\mathrm{ClO}}_2^{-}$
3.  ${\mathrm{Cl}}_2\mathrm{O} < {\mathrm{ClO}}_2^{-} < {\mathrm{ClO}}_2$
4.  ${\mathrm{ClO}}_2^{-} < {\mathrm{Cl}}_2\mathrm{O} <{\mathrm{ClO}}_2$

The correct shape and hybridization for XeF₄ are:
1. octahedral, sp³d²
2. trigonal bipyramidal, sp³d³
3. planar triangle, sp³d³
4. square planar, sp³d²

A diatomic molecule, among the following species, that only has $\mathrm{\pi }$ bonds according to the Molecular Orbital Theory (MOT) is:

CaO and NaCl have the same crystal structure and approximately the same ionic radii. If U is the lattice energy of NaCl, the approximate lattice energy of CaO is :-
1. U/2 
2. U 
3. 2 U 
4. 4 U

In bisulphate ion, HSO₄^-, the formal charge on S atom is
1. +6
2. +4
3. +1
4. +2

Which has non-zero dipole moment?
1. PCl₅
2. PCl₃F₂
3. PCl₃Br₂
4. PCl₃(CH₃)₂

Which is incorrect about bond angles?
1. NH₃ > NF₃
2. NF₃ < PF₃
3. NH₃ > PH₃
4. NH₃ > H₂O

The correct statement is
1. When O₂ is converted into $O_2^{+}$ then bond distance increases
2. When N₂ is converted into $N_2^{+}$ then bond distance increases
3. When CO is converted into CO⁺ then bond distance increases
4. All of these

In which case observed dipole moment is greater than theoretical dipole moment?
1. 
2. 
3. 
4. 

Consider the following structures :

 
1. ${\mathrm{\theta }}_1>{\mathrm{\theta }}_2>{\mathrm{\theta }}_3>{\mathrm{\theta }}_4$
2 ${\mathrm{\theta }}_1>{\mathrm{\theta }}_3>{\mathrm{\theta }}_4>{\mathrm{\theta }}_2$
3. ${\mathrm{\theta }}_3>{\mathrm{\theta }}_1>{\mathrm{\theta }}_2>{\mathrm{\theta }}_4$
4. ${\mathrm{\theta }}_1>{\mathrm{\theta }}_3>{\mathrm{\theta }}_2>{\mathrm{\theta }}_4$