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

Which of the following facts given is not correct?

1. I, II & III
2. I & IV
3. II & IV
4. I & II

${\mathrm{N}}_2$ and ${\mathrm{O}}_2$ are converted to monocations ${\mathrm{N}}_2^{+}$ and ${\mathrm{O}}_2^{+}$ respectively. Which of the following is incorrect?
1. In ${\mathrm{N}}_2^{+}$, the $\mathrm{N}-\mathrm{N}$ bond weakens.
2. In ${\mathrm{O}}_2^{+}$, the $\mathrm{O}-\mathrm{O}$ bond order increases.
3. In ${\mathrm{O}}_2^{+}$, the paramagnetism decreases.
4. ${\mathrm{N}}_2^{+}$ becomes diamagnetic.

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 boiling point is :

1. I > II >III
2. III > II > I
3. II > I > III
4. III > I > II

${\mathrm{BF}}_3$ and ${\mathrm{NF}}_3$ both are covalent compounds but ${\mathrm{NF}}_3$ is polar whereas ${\mathrm{BF}}_3$ is non-polar. This is because :
1. Nitrogen atom is smaller than boron atom
2. N-F bond is more polar than B-F bond
3. NF${}_3$ is pyramidal whereas BF${}_3$ is planar triangular
4. BF${}_3$ is electron deficient whereas NF${}_3$ is not

Which of the following molecules will have polar bonds but zero dipole moment?
$1. {\mathrm{O}}_2$
$2. {\mathrm{CHCI}}_3$
$3. {\mathrm{CF}}_4$
$4. \mathrm{none} \mathrm{of} \mathrm{these}$

How many sp${}^2$ and sp-hybridised carbon atoms are present respectively in the following compound ?

1. 4, 2
2. 6, 0
3. 3, 3
4. 5, 1
 

Which of the following species used both axial set of d-orbitals in hybridization of central atom ?
$$\begin{gathered} 1. {\mathrm{PBr}}_4^{+} \\ 2. {\mathrm{PCI}}_4^{-} \\ 3. {\mathrm{ICI}}_4^{-} \\ 4. \mathrm{None} \mathrm{of} \mathrm{these} \end{gathered}$$

Which atom can have more than eight valence electrons when it is forming covalent bonds ?
1. H
2. N
3. F
4. Cl

Which molecule does not exist ?
$1. {\mathrm{OF}}_2$
$2. {\mathrm{OF}}_4$
$3. {\mathrm{SF}}_2$
$4. {\mathrm{SF}}_4$

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

0.01 mole of ${\mathrm{H}}_3{\mathrm{PO}}_{\mathrm{x}}$ is completely neutralized by 0.56 gram of KOH hence :
1. x = 3 and given acid is dibasic
2. x = 2 and given acid is monobasic
3. x = 3 and given acid is monobasic
4. x = 4 and given acid forms three series of salt

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

The geometrical arrangement of orbitals and shape I${}_3^{-}$ are respectively :
1. trigonal bipyramidal geometry, linear shape
2. hexagonal geometry, triangular shape
3. triangular planar geometry, triangular shape
4. tetrahedral geometry, pyramidal shape

Which is the following pairs of species have identical shapes ?
$1. {\mathrm{NO}}_2^{+} \mathrm{and} {\mathrm{NO}}_2^{-}$
$2. {\mathrm{PCI}}_5 \mathrm{and} {\mathrm{BrF}}_5$
$3. {\mathrm{XeF}}_4 \mathrm{and} {\mathrm{ICI}}_4^{-}$
$4. {\mathrm{TeCl}}_4 \mathrm{and} {\mathrm{XeO}}_4$

Which of the following leads to bonding ?
1. 
2. 
3. 
4. 

Which of the following overlap is incorrect (assuming Z-axis is internuclear axis) ?
(A) $2{\mathrm{p}}_{\mathrm{y}} + 2{\mathrm{p}}_{\mathrm{y}} \to \mathrm{\pi }$ - Bond formation
(B) $2{\mathrm{p}}_{\mathrm{x}} + 2{\mathrm{p}}_{\mathrm{x}} \to \mathrm{\sigma }$ - Bond formation
(C) $3{\mathrm{d}}_{\mathrm{xy}} + 3{\mathrm{dp}}_{\mathrm{xy}} \to \mathrm{\pi }$ - Bond formation
(D) $2\mathrm{s} + 2{\mathrm{p}}_{\mathrm{y} }\to \mathrm{\pi }$ - Bond formation
(E) $3{\mathrm{d}}_{\mathrm{xy}} + 3{\mathrm{d}}_{\mathrm{xy}} \to \mathrm{\delta }$ - Bond formation
(F) $2{\mathrm{p}}_{\mathrm{z}} + 2{\mathrm{p}}_{\mathrm{z}} \to \mathrm{\sigma }$ - Bond formation
1. A, B, C
2. C, F
3. B, E
4. B, C, D

Which of the following is not present in ${\mathrm{XeO}}_3$ molecule ?
$1. {\mathrm{sp}}^3 + {\mathrm{p}}_{\mathrm{x}}$
$2. {\mathrm{sp}}^3 + {\mathrm{p}}_{\mathrm{y}}$
$3. {\mathrm{d}}_{\mathrm{xz}} +\hspace{0.17em}{\mathrm{p}}_{\mathrm{x}}$
$4. {\mathrm{sp}}^3 +\hspace{0.17em}\mathrm{s}$

The incorrect order of lattice energy is :
$1. {\mathrm{AIF}}_3 > {\mathrm{MgF}}_2$
$2. {\mathrm{Li}}_3\mathrm{N} > {\mathrm{Li}}_2\mathrm{O}$
$3. \mathrm{NaCl} > \mathrm{LiF}$
$4. \mathrm{TiC} > \mathrm{ScN}$

The bond angles of \(\mathrm{NH}_3, \mathrm{NH}^+_4~\mathrm{and}~\mathrm{NH}^-_2\) are in the order : 

The "O-N-O" bond angle is maximum in 
1. ${\mathrm{N}}_2\mathrm{O}$
2. ${\mathrm{NO}}_2^{+}$
3. ${\mathrm{NO}}_2^{-}$
4. ${\mathrm{NO}}_3^{-}$

Which of the following is incorrectly match?

Which of the following has a maximum 'Cl-O' bond order?
1. ${\mathrm{ClO}}_3^{-}$
2. ${\mathrm{ClO}}_3$
3. ${\mathrm{ClO}}_2$
4. ${\mathrm{ClO}}_2^{-}$

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