Chemical Bonding and Molecular Structure

Which among the following molecules is (a) involved in sp3d hybridization, (b) has different bond lengths and (c) has lone pair of electrons on the central atom?

1. XeF4
2. XeF2
3. PF5
4. SF4

An element 'E' has the ionisation enthalpy value of 374 kJ mol-1. 'E' reacts with elements A, B, C and D with electron gain enthalpy values of −328, −349, −325 and −295 kJ mol-1, respectively. The correct order of the products EA, EB, EC and ED in terms of ionic character is :

1. EB > EA > EC > ED
2. EA > EB > EC > ED
3. ED > EC > EA > EB
4. ED > EC > EB > EA

The sum of sigma ( ) and pi ( ) bonds in Hex-1,3-dien-5-yne is .

Total number of non-bonded electrons present in NO2- ion based on Lewis theory is .

The molecules having square pyramidal geometry are

1. BrF5 & PCl5
2. SbF5 & PCl5
3. BrF5 & XeOF4
4. SbF5 & XeOF4

Total number of molecules/species from the following which will be paramagnetic is . O2, O2+, O2-, NO, NO2, CO, K2[NiCl4], [Co(NH3)6]Cl3, K2[Ni(CN)4]

Which of the following linear combination of atomic orbitals will lead to formation of molecular orbitals in homonuclear diatomic molecules [internuclear axis in z-direction] ? Choose the correct answer from the options given below:

1. D Only
2. E Only
3. C and D Only
4. A and B Only

Which of the following statement is true with respect to H2O, NH3 and CH4 ? Choose the correct answer from the options given below:

1. A, D and E Only
2. C, D and E Only
3. A, B and C Only
4. A, B, C and E Only

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :

1. Statement I is false but Statement II is true
2. Both Statement I and Statement II are true
3. Statement I is true but Statement II is false
4. Both Statement I and Statement II are false

Match the List - I with List - II Choose the correct answer from the options given below:

1. A-IV, B-I, C-III, D-II
2. A-II, B-IV, C-III, D-I
3. A-IV, B-II, C-I, D-III
4. A-III, B-II, C-I, D-IV

The number of molecules/ions that show linear geometry among the following is . SO2, BeCl2, CO2, N3-, NO2, F2O, XeF2, NO2+, I3-, O3

Arrange the following compounds in increasing order of their dipole moment : HBr, H2S, NF3 and CHCl3

1. HBr < H2S < NF3 < CHCl3
2. H2S < HBr < NF3 < CHCl3
3. NF3 < HBr < H2S < CHCl3
4. CHCl3 < NF3 < HBr < H2S

In which one of the following pairs the central atoms exhibit sp2 hybridization ?

1. BF3 and NO2-
2. NH2- and BF3
3. NH2- and H2O
4. H2O and NO2

The total number of species from the following in which one unpaired electron is present, is . N2, O2, C2-, O2-, O22-, H2+, CN-, He2+

The correct increasing order for bond angles among BF3, PF3 and ClF3 is :

1. BF3 = PF3 < ClF3
2. BF3 < PF3 < ClF3
3. ClF3 < PF3 < BF3
4. PF3 < BF3 < ClF3

Total number of electrons present in ( ) molecular orbitals of O2, O2+ and O2- is .

Match List I with List II Choose the correct answer from the options given below:

1. A-II, B-IV, C-I, D-III
2. A-III, B-I, C-IV, D-II
3. A-IV, B-III, C-I, D-II
4. A-III, B-IV, C-I, D-II

Number of molecules from the following which are exceptions to octet rule is . CO2, NO2, H2SO4, BF3, CH4, SiF4, ClO2, PCl5, BeF2, C2H6, CHCl3, CBr4

When A and B are the wave functions of atomic orbitals, then is represented by :

1. A + 2 B
2. A - B
3. A - 2 B
4. A + B

Number of molecules having bond order 2 from the following molecules is . C2, O2, Be2, Li2, Ne2, N2, He2

Match List I with List II Choose the correct answer from the options given below:

1. A-III, B-II, C-IV, D-I
2. A-III, B-IV, C-II, D-I
3. A-II, B-IV, C-III, D-I
4. A-II, B-III, C-I, D-IV

Match List I with List II Choose the correct answer from the options given below:

1. A-II, B-III, C-I, D-IV
2. A-III, B-I, C-II, D-IV
3. A-IV, B-I, C-III, D-II
4. A-III, B-IV, C-II, D-I

Match List I with List II Choose the correct answer from the options given below:

1. A-III, B-I, C-IV, D-II
2. A-III, B-IV, C-I, D-II
3. A-IV, B-III, C-I, D-II
4. A-II, B-I, C-IV, D-III

Number of molecules from the following which can exhibit hydrogen bonding is . (nearest integer) CH3OH, H2O, C2H6, C6H6, [figure] , HF, NH3

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :

1. Both Statement I and Statement II are false
2. Statement I is true but Statement II is false
3. Statement I is false but Statement II is true
4. Both Statement I and Statement II are true

Total number of species from the following with central atom utilising sp2 hybrid orbitals for bonding is . NH3, SO2, SiO2, BeCl2, C2H2, C2H4, BCl3, HCHO, C6H6, BF3, C2H4Cl2

In the Lewis dot structure for NO2-, total number of valence electrons around nitrogen is .

Match List I with List II. Choose the correct answer from the options given below :

1. (A)-(I), (B)-(IV), (C)-(III), (D)-(II)
2. (A)-(IV), (B)-(I), (C)-(II), (D)-(III)
3. (A)-(I), (B)-(III), (C)-(II), (D)-(IV)
4. (A)-(IV), (B)-(III), (C)-(II), (D)-(I)

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). In the light of the above statements, choose the correct answer from the options given below :

1. (A) is false but (R) is true
2. (A) is true but (R) is false
3. Both (A) and (R) are true but (R) is NOT the correct explanation of (A)
4. Both (A) and (R) are true and (R) is the correct explanation of (A)

Number of compounds from the following with zero dipole moment is . HF, H2, H2S, CO2, NH3, BF3, CH4, CHCl3, SiF4, H2O, BeF2