Which atom can have more than eight valence electrons when it is forming covalent bond?

1. H

2. N

3. F

4. Cl

Select the incorrect match:

        Statement                               Shape                                    Example

(a) Bond pair has > 75%                                                 HF

p-character

(b) Reduction in axial bond                                     ${\mathrm{SF}}_4$

is more than that of in 

equatorial bond angle

(c) Two axial d-orbitals and                                       ${\mathrm{XeF}}_5^{-}$

one non-axial d-orbitals are

used in hybridization

(d) Two p-orbitals are used                                               ${\mathrm{SnCl}}_2$

in hybridization

The least polar bond is present in which of the following?

Select correct statement(s) :

(1) Acidic strength of $\mathrm{HBr}>\mathrm{HCl}$ but reverse is true for their reducing property 

(2) Basic strength of ${\mathrm{PH}}_3>{\mathrm{AsH}}_3$ but reverse is true for their bond angle

(3) Dipole moment of ${\mathrm{CH}}_3\mathrm{Cl}>{\mathrm{CH}}_3\mathrm{F}$ but reverse is true for their $\mathrm{H}\hat{\mathrm{C}}\mathrm{H}$ bond angle

(4) ${\mathrm{K}}_{{\mathrm{a}}_1}$ of fumaric acid is higher than maleic acid but reverse is true for their ${\mathrm{K}}_{{\mathrm{a}}_2}$

Which set contains only covalently bonded molecules?

(1) $BC{l}_{3 }, SiC{l}_4 ,PC{l}_3$

(2) $N{H}_{4}Br , N_2{H}_4,HBr$

(3) $I_{2 ,}{H}_{2}S , NAI$

(4) $A{l}_2,O_{3 }, A{S}_4$

In which of the following species, d-orbitals having xz and yz two nodal planes involved in hybridization of central atom?

(a) ${\mathrm{IO}}_2{\mathrm{F}}_2^{-}$                                  (b) ${\mathrm{ClF}}_4^{-}$

(c) ${\mathrm{IF}}_7$                                       (d) None of these 

Select pair of compound in which both have differant hybridization but have same molecular geomatery:

(1)  $B{F}_{3,}Br{F}_3$       

(2) $IC{I}_2,BeC{I}_2$   

(3)$BC{I}_{3,}PC{I}_3$   

(4) $PC{I}_{3,}NC{I}_3$

Which of the following molecules does not exist?

1. $O{F}_2$

2. $O{F}_4$

3. $S{F}_2$

4. $S{F}_4$

The species having no p$\mathrm{\pi }$-p$\mathrm{\pi }$ bond but has a bond order equal to that of $O_2$

(a) $CIO\underset{3}{-}$     

(b) $P{O_4}^{3-}$   

(c)$S{O_4}^{2-}$   

(d) $Xe{O}_3$

Which pair of atom form strongest ionic bond?

(1) Al and As

(2) Al and N

(3) Al and Se

(4) AL and O