In which of the following all have pyramidal shape :

(1) ${\mathrm{NH}}_3,{\mathrm{NO}}_3^{-},{\mathrm{XeF}}_4$      (2) IF₅, PCl₃, SF₄

(3) IOF₅, PCl₃, TeCl₄      (4) ${\mathrm{SF}}_5^{-},{\mathrm{IF}}_5,{\mathrm{SOCl}}_2$ 

The exception to being angular in shape is:

The molecules that will have dipole moments are :          

1. 1,2-dichloro benzene                              

2. cis-3-hexene           

3. trans-2-pentene                    

4. all of these

The correct order of increasing s-character (in percentage) in the hybrid orbitals of following molecules/ion is :

(i) ${\mathrm{CO}}_3^{2-}$   (ii) XeF₄     (iii) ${\mathrm{I}}_3^{-}$       (iv) NCl₃

(v) BeCl₂

1.  ii < iii < iv < i < v

2. ii < iv < iii < v < i

3. iii < ii < i < v < iv        

4. ii < iv < iii < i < v

The maximum number of 90° angles between bond-pair-bond pair of electron is observed in :

1.  sp³d²-hybridization              

2.  sp³d-hybridization 

3.  dsp²-hybridization               

4.  dsp³-hybridization 

Mg₂C₃ reacts with water forming propyne ${\mathrm{C}}_3^{4-}$ has :       

1. two sigma and two pi bonds                   

2. three sigma and one pi bonds           

3. two sigma and one pi bonds          

4. two sigma and three pi binds

Which of the following molecule is having complete octet :

 1. BeCl₂(dimer)       

 2. BeH₂(dimer)

 3. BeH₂(s)               

 4. BeCl₂(s)

Which of the molecule is not hypovalent but complete octet :

1. AlCl₃                   

2. AlBr₃

3. AlF₃                     

4. BF₃

Among the following oxides, which has the maximum lattice energy?
1. MgO
2. CaO
3. SrO
4. BaO

Among the following, which has the maximum hydration energy?

1. OH^-

2. ${\mathrm{NH}}_4^{+}$

3. F^-

4. H⁺