On the left are given decreasing orders of elements for a certain property and on the right side is given the property. The incorrect order for the given properties is:

1. ${\mathrm{AlF}}_3>\mathrm{MgO}>{\mathrm{MgF}}_2$    : Lattice energy

2. $\mathrm{Li}>\mathrm{Na}>\mathrm{Al}>\mathrm{Mg}$       : Electron affinity

3. ${\mathrm{PF}}_5>$ ${\mathrm{SF}}_6$ $>$ ${\mathrm{SiF}}_4$      : Lewis acidic character

4. ${\mathrm{SiCl}}_4>{\mathrm{SiBr}}_4$ $>{\mathrm{SiI}}_4$   : Decreasing ionic character

What is the shape of the $IB{r_2}^{-}$ ion ?

(1) Linear 

(2) Bent shape with bond angle of about $90°$ 

(3) Bent shape with bond angle of about $109°$

(4) Bent shape with bond angle of about $120°$

What is the shape of the $Cl{F}_3$ molecule?

(1) Trigonal planar 

(2) Trigonal pyramid 

(3) T-shaped 

(4) Tetrahedral 

Which of the following compound has the smallest bond angle (X$—$A$—$Z) in each series respectively?

(1) $OS{F}_{2 } OSC{l}_2$             $OSB{r}_2$

(2) $SbC{l}_3$     $SbB{r}_3$              $Sb{I}_3$

(3) $P{I}_3$         $As{I}_3$                  $Sb{I}_3$

Options are as follows: 

(a) $OS{F}_2, SbCl and P{I}_3$    (b) $OSB{r}_2, SB{I}_3 and P{I}_3$

(c) $OS{F}_2, SB{I}_3 and P{I}_3$       

(4) $OS{F}_2, SBC{l}_3 and SB{I}_3$

According to VSEPR theory in, which species do all the atoms lie in the same plane?

1. $C{H_3}^{+}$                                   2. $C{H_3}^{-}$

(1) 1 only                               

(2) 2 only 

(3) both 1 and 2                     

(4) neither 1 nor 2

Idetify the correct sequence of increasing number of $\mathrm{\pi }$ bonds in the structure of the following molecules :

(I) $H_2{S}_2{O}_6$     (II) $H_2{S}_{}{O}_3$   (III)  $H_2{S}_2{O}_5$

1. I II and III         2. II I and III

3. II III and I         4. I III and II

The state of hybridisation of central atom in dimer of $B{H}_3$ and $Be{H}_2$ is:

(1) $s{p}^2,s{p}^2$   

(2) $s{p}^3,s{p}^2$ 

(3) $s{p}^3,s{p}^3$ 

(4) $s{p}^2,s{p}^3$

Which of the following species/molecules does not have same number of bond pairs and lone pairs?

(1) $OC{N}^{-}$ 

(2) $H_{2}O$

(3) $C_2{H}_{2}C{l}_2$

(4) $O_3$

O$—$O bond length ($\mathrm{in} \stackrel{°}{\mathrm{A}}$ ) in  $H_2{O}_2$ and $O_2{F}_2$ is respectively: