Which of the following is a pair of polar molecules?

1. ${\mathrm{CO}}_2$ $\mathrm{and}$ ${\mathrm{H}}_2\mathrm{O}$

2. ${\mathrm{BF}}_3$ $\mathrm{and}$ ${\mathrm{PCl}}_3$

3. ${\mathrm{SO}}_2$ $\mathrm{and}$ ${\mathrm{SCl}}_2$

4. ${\mathrm{CS}}_2$ $\mathrm{and}$ ${\mathrm{SO}}_3$

In which molecule does the chlorine atom has positive partial charge? 

(1) HCl

(2) BrCl 

(3) $OC{l}_2$

(4) $SC{l}_2$

The incorrect order of lattice energy among the following set is:

1. ${\mathrm{AlF}}_3>{\mathrm{MgF}}_2$         

2. ${\mathrm{Li}}_3\mathrm{N}>{\mathrm{Li}}_2\mathrm{O}$

3. $\mathrm{NaCl}>\mathrm{LiF}$           

4. $\mathrm{TiC}>\mathrm{ScN}$

Which of the following set of species have planar structures?

(a) ${\mathrm{I}}_3^{-}, {\mathrm{CH}}_3, {\mathrm{CLO}}_3^{-}, {\mathrm{SiF}}_6^{2-}$

(b) ${\mathrm{I}}_3^{+}, {\mathrm{ICl}}_4^{-}, {\mathrm{Al}}_2{\mathrm{Cl}}_6, {\mathrm{TeCl}}_4$

(c) ${\mathrm{SCl}}_2, {\mathrm{N}}_2{\mathrm{O}}_5, {\mathrm{SF}}_4,{\mathrm{XeOF}}_4$

(d) ${\mathrm{I}}_2{\mathrm{Cl}}_6, {\mathrm{XeF}}_2, {\mathrm{BrF}}_4^{-}$

Both $\mathrm{N}{\left({\mathrm{SiH}}_3\right)}_3$ and $\mathrm{NH}{\left({\mathrm{SiH}}_3\right)}_2$compounds have trigonal planer skeleton. Incorrect statement about both compound is :

(1) SiNSi bond angle in $\mathrm{NH}{\left({\mathrm{SiH}}_3\right)}_2$ $>$ SiNSi bond angle in $N{\left({\mathrm{SiH}}_3\right)}_3$

(2) $\mathrm{N}-\mathrm{Si}$ bond length in $\mathrm{NH}{\left({\mathrm{SiH}}_3\right)}_2>\mathrm{N}-\mathrm{Si}$ bond length in $\mathrm{N}{\left({\mathrm{SiH}}_3\right)}_3$

(3) $N-Si$ bond length in $\mathrm{NH}{\left({\mathrm{SiH}}_3\right)}_2<N-Si$ bond length in $\mathrm{N}{\left({\mathrm{SiH}}_3\right)}_3$

(4) Back bonding strength in $\mathrm{NH}{\left({\mathrm{SiH}}_3\right)}_2>$ Back bonding strength in $N{\left({\mathrm{SiH}}_3\right)}_3$

Which ionic compound has the largest amount of lattice energy?

$\left(a\right) NaF \left(b\right)Al{F}_3$
$\left(c\right)AIN \left(d\right)Mg{F}_2$

The incorrect statement regarding $\mathrm{O}{\left({\mathrm{SiH}}_3\right)}_2$ and ${\mathrm{OCl}}_2$ molecule is/are:

(1) The strength of back bonding is more in $\mathrm{O}{\left({\mathrm{SiH}}_3\right)}_2$ molecule than ${\mathrm{OCl}}_2$ molecule

(2) $\mathrm{Si}—\mathrm{O}—\mathrm{Si}$ bond angle in $\mathrm{O}{\left({\mathrm{SiH}}_3\right)}_2$ is greater than $\mathrm{Cl}—\mathrm{O}—\mathrm{Cl}$ bond angle in ${\mathrm{OCl}}_2$

(3) The nature of back bond in both molecules is $2{\mathrm{p}}_{\sigma }‐3{\mathrm{d}}_{\mathrm{\pi }}$

(4) Hybridisation of central $\mathrm{O}‐\mathrm{atom}$ in both molecules is same

Which of the following compound have the same no. of lone pair with their central atom?

(i)${\mathrm{XeF}}_5^{- }$             

(ii) ${\mathrm{BrF}}_3$                 

(iii) ${\mathrm{XeF}}_2$                     

(iv) ${\mathrm{H}}_3{\mathrm{S}}^{+}$               

(v) Triple Methylene     

options are as follows :        

(1) (iv) and (v)                                     

(2) (i) and (iii) 

(3) (i) and (ii)                                     

(4) (ii) (iv), (v)

The incorrect order of the force of attraction among the given species is :

1. HI > HBr> ${\mathrm{Cl}}_2$

2. ${\mathrm{CCl}}_4>{\mathrm{CH}}_2{\mathrm{Cl}}_2>{\mathrm{CH}}_3\mathrm{Cl}>{\mathrm{CH}}_4$

3. n- Pentane > iso-Pentane > neo-Pentane

4. ${\mathrm{OH}}_2>\mathrm{O}{\left({\mathrm{CH}}_3\right)}_2>{\mathrm{OBr}}_2$

The "O$-$N$-$O" bond angle is maximum in:

$\left(a\right) N_{2}O \left(b\right)N{O_2}^{+}$
$\left(C\right)N{O_2}^{-} \left(d\right) N{O_3}^{-}$