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Which of the molecule is not hypovalent but complete octet :
1. AlCl₃                   
2. AlBr₃
3. AlF₃                     
4. BF₃

Which of the following molecule is having complete octet :
 1. BeCl₂(dimer)       
 2. BeH₂(dimer)
 3. BeH₂(s)               
 4. BeCl₂(s)

In which of the following molecules would you expect the nitrogen-to-nitrogen bond to be the shortest?         
(1) N₂H₄                    (2) N₂         
(3) N₂O₄                     (4) N₂O

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

According to Born-Haber's cycle, the enthalpy of formation of ionic compounds can be determined. The formation of NaCl involves following steps :
(I) Na(s)$\underset{\mathrm{Energy} \mathrm{of} \mathrm{sublimation}}{\overset{\mathrm{S}}{\to }}$ Na(g)       
(II) Na(g)$\underset{Ionisation potential}{\overset{I}{\to }}$ Na⁺(g) + e^–
(III) Cl₂(g) $\underset{Bond dissociation energy}{\overset{D}{\to }}$2Cl(g)
(IV) Cl(g) + e^– $\underset{\mathrm{Electron}-\mathrm{affinity}}{\overset{E}{\to }}$Cl^–(g)
 (V) Cl^–(g) + Na⁺(g)$\underset{Lattice energy}{\overset{U}{\to }}$ NaCl(S)
The enthalpy of formation of NaCl will be :
1. $∆{\mathrm{H}}_{\mathrm{f}}=\mathrm{S}+\mathrm{I}-\frac{\mathrm{D}}{2}-\mathrm{E}-\mathrm{U}$
2. $∆{\mathrm{H}}_{\mathrm{f}}=\mathrm{S}+\mathrm{I}+\frac{\mathrm{D}}{2}-\mathrm{E}-\mathrm{U}$
3. $∆{\mathrm{H}}_{\mathrm{f}}=-\mathrm{S}-\mathrm{I}-\mathrm{D}+\frac{E}{2}+\mathrm{U}$
4. $∆{\mathrm{H}}_{\mathrm{f}}=-\mathrm{S}-\mathrm{I}-\mathrm{D}-\frac{E}{2}-\mathrm{U}$

Which of the following is an electron-deficient compound?     
(1) NaBH₄                        (2) CO₂        
(3) B₂H₆                          (4) Al₂Cl₆
 

One of the following is least volatile :        
1. HCN                     
2. HF        
3. H₂O                     
4. CS₂

Amongst H₂O, H₂S, H₂Se and H₂Te, the one with the highest boiling point is :                     
(1)  H₂O because of hydrogen bonding
(2)  H₂Te because of higher molecular weight          
(3)  H₂S because of hydrogen bonding            
(4)  H₂Se because of lower molecular weight

A : tetracyanomethane
B : carbondioxide
C : benzene
D : 1,3-buta-di-ene
Ratio of $\mathrm{\sigma }$ and $\mathrm{\pi }$ bonds is in order :       
1. A = B < C < D           
2. A = B < D < C           
3. A = B = C = D           
4.  C < D < A < B

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 

One of the following ions has a trigonal planar shape :
1. ${\mathrm{SO}}_3^{2-}$
2. ${\mathrm{PO}}_4^{3-}$
3. ${\mathrm{CN}}^{-}$
4. ${\mathrm{CO}}_3^{2-}$

Which of the following molecules or ions is not linear ?               
1. BeCl₂                 
2. ${\mathrm{ICl}}_2^{-}$        
3. CS₂                     
4. ${\mathrm{ICl}}_2^{+}$

Which reaction involves a change in the electron-pair geometry for the underlined atom?
1. BF₃ $+{\mathrm{F}}^{-}\to {\mathrm{BF}}_4^{-}$ 
2. NH₃$+{\mathrm{H}}^{+}\to {\mathrm{NH}}_4^{+}$
3. 2SO₂$+{\mathrm{O}}_2\to 2{\mathrm{SO}}_3$ 
4. H₂O$+{\mathrm{H}}^{+}\to {\mathrm{H}}_3{\mathrm{O}}^{+}$   

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

Which of the following condition show linear geometry (b.p. = Bond pair, I.p. = Lone pair) :
(a)  Molecule in which central atom show sp³d hybridisation and contain 3 b.p. and 2 l.p.
(b)  Any diatomic molecule
(c)  Tri-atomic molecule in which central atom has 2 l.p and 2$\mathrm{\sigma }$ b.p.
(d)  Molecule in which central atom has 2$\mathrm{\sigma }$ b.p. and 2$\mathrm{\pi }$ b.p. and contain no. l.p.
1. a, b                       2. b, d
3. a, c, d                   4. a, b, c, d

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) ${\mathrm{SF}}_5^{-},{\mathrm{IF}}_5,{\mathrm{SOCl}}_2$ 

Which is non-angular species :
1. ${\mathrm{I}}_3^{+}$                2. ${\mathrm{ClO}}_2^{-}$    
3. SO₂              4. ${\mathrm{I}}_3^{-}$  

Which of the following pairs of species have identical shapes?
(1) ${\mathrm{NO}}_2^{+} \mathrm{and} {\mathrm{NO}}_2^{-}$          (2) PCl₅ and BrF₅
(3) XeF₄ and ${\mathrm{ICl}}_4^{-}$          (4) TeCl₄ and XeO₄

Match the column :

1. P = II, Q = IV, R = III, S = VI
2.  P = II, Q = IV, R = I, S = V
3.  P = II, Q = I, R = V, S = VI  
4.  P = II, Q = I, R = III, S = IV

Identify incorrect order of bond angles :
1. Cl₂O > F₂O and F₂O < H₂O
2.  AsI₃ > AsBr₃ > AsCl₃
3. ${\mathrm{NO}}_2^{+}>{\mathrm{NO}}_2^{-}$ 
4. ${\mathrm{NO}}_2^{-}>{\mathrm{NO}}_2$

Which of the following can provide an electron pair for the formation of a coordinate covalent bond?               
(1) H⁺                        (2) H^–           
(3) H₂                             (4) He²⁺

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

Among the following species, identify the isostructural pairs :
NF₃, , BF₃, H₃O⁺, HN₃, ${\mathrm{NO}}_3^{-}$
1. [NF₃,${\mathrm{NO}}_3^{-}$ ] and [BF₃, H₃O⁺]                  
2. [NF₃, HN₃] and [${\mathrm{NO}}_3^{-}$, BF₃]   
3. [NF₃, H₃O⁺] and [${\mathrm{NO}}_3^{-}$, BF₃]         
4. [NF₃, H₃O⁺] and [HN₃, BF₃]