Assuming that Hund's rule is violated, the bond order and magnetic nature of the diatomic molecule $B_2$ is:

1.	1 and diamagnetic	2.	0 and diamagnetic
3.	1 and paramagnetic	4.	0 and paramagnetic

The species having pyramidal shape is:

(1) $S{O}_3$

(2) $Br{F}_3$

(3) $Si{O}_3^{2-}$

(4) OSF₂

Among the following the maximum covalent character is shown by the compound:

(1) FeCl₂

(2) SnCl₂

(3) AlCl₃

(4) MgCl₂

Which of the following statement is wrong?

(1) The stability of hydrides increase from NH₃ to BiH₃ is group 15 of the periodic table.

(2) Nitrogen cannot form $d\mathrm{\pi }-\mathrm{p\pi }$ bond.

(3) Single N-N bond is weaker than the single P-P bond.

(4) $N_2{O}_4$ has four resonance structure

The structure of ${\mathrm{IF}}_7$ is

(1) square pyramid

(2) trigonal bipyramid

(3) octahedral

(4) pentagonal bipyramid

In which of the following pairs the two species are not isostructural?

(1) $PC{l}_4^{+}<mspace\; width="1em"></mspace>and<mspace\; width="1em"></mspace>SiC{l}_4$

(2) $P{F}_5<mspace\; width="1em"></mspace>and<mspace\; width="1em"></mspace>Br{F}_5$

(3) $Al{F}_6^{3-}$ and $S{F}_6$

(4) $C{O}_3^{2-}<mspace\; width="1em"></mspace>and<mspace\; width="1em"></mspace>N{O}_3^{-}$

In allene $\left(C_3{H}_4\right),<mspace\; width="1em"></mspace>$ the type(s) of hybridization of the carbon atoms is (are):

1. sp and sp³

2.  sp and sp²

3. only sp²

4.  sp² and sp³

The shape of $Xe{O}_2{F}_2$ molecule is:

(1) trigonal bipyramidal

(2) square planar

(3) tetrahedral 

(4) see-saw

How many number of water molecule (s) directly bonded to the metal centre in $CuS{O}_4<mspace\; width="1em"></mspace>.<mspace\; width="1em"></mspace>5H_{2}O<mspace\; width="1em"></mspace>$is

(1) 3

(2) 2

(3) 4

(4) 5

A molecule having the smallest bond angle among the following is :