Chemical Bond





Chemical bond is the attraction between two or more atoms that allows the formation of chemical substances. The formation of bond is due to electronmagnetic force of attraction between opposite charges.

There are three types of Chemical bond.

They are :

1. Ionic bond
2. Covalent bond
3. Polar covalent bond

Here you can find some question and answers related to chemical bonding.

 

Questions:

1. Which of the following species are hypervalent:

1. ClO^-_4 2. BF_3 3. SO^{2-}_4 4. CO^{2-}_3

(a)    1, 2, 3

(b)   1, 3

(c)    3, 4

(d)   1, 2

 

2. The expected shape of Br^-_3 ion is:

(a)    Linear

(b)   Trigonal planar

(c)    Pyramidal

(d)   Angular

 

3. Pick out the incorrect statement:

(a)    N_2 has greater dissociation energy than N^+_2

(b)   O_2 has lower dissociation energy than O_2^+

(c)    Bond length in N^+_2 is less than N_2

(d)   Bond length in NO^+ is less than NO

 

4. Which of the following molecular orbitals has two nodal places:

(a)    \sigma 2s

(b)   \pi^* 2py

(c)    \pi 2py

(d)   \sigma^*2pz

 

5. The dipole moment of SO_2 \text{and} CO_2 are 1-60 D and OD respectively. It is best explained by:

(a)    Presence of polar bonds in SO_2 but not in CO_2

(b)   Electronegativities of C and O are not equal

(c)    SO_2 molecule is linear but CO_2 is non-linear

(d)   SO_2 molecule is non-linear but CO_2 is linear

 

6. Which is not correctly matched ?

(a)    XeO_3 : Trigonal bipyramidal

(b)   ClF_3 : T-shape

(c)    XeOF_4 : Square pyramidal

(d)   XeF_2 : Linear shape

 

7. Which has maximum ionic mobility

(a)    Li^+

(b)   Na^+

(c)    K^+

(d)   Cs^+

 

8. Which has maximum covalent character ?

(a)    LiF

(b)   LiCl

(c)    LiBr

(d)   LiI

 

9. Hybridization of P in PO^{-3}_4  is same as:

(a)    S \text{in} SO_3

(b)   N \text{in} NO_3^-

(c)    I \text{in} ICl_2^+

(d)   I \text{in} ICl^-_4

 

10. in PO^{-3}_4, P – O bond order is:

(a)    1.25

(b)   2

(c)    -0.75

(d)   -3

 

11. Which of the following sets of species are comparable in stability?

(a)    H^+_2 \text{and} He^{+2}

(b)   He \text{and} He_2

(c)    O_2 \text{and} N_2

(d)   H_2 \text{and} H^+_2

 

12. A diatomic molecule has a dipole moment of 1.92 D and a bond length of 2.0 \AA. What is the percentage ionic character in the molecule if e = 4.8 \times 10^{-10}esu :

(a)    33%

(b)   25%

(c)    20%

(d)   50%

 

13. The correct increasing bond angle among BF_3, PF_3 \text{and} CIF_3 follows the order:

(a)    BF_3 < PF_3 < ClF_3

(b)   PF_3 < BF_3 < ClF_3

(c)    ClF_3 < PF_3 < BF_3

(d)   BF_3 \approx PF_3 \approx ClF_3

 

14. which of the following does not obey 18 electron rule?

(a)    Fe(CO)_5

(b)   V(CO)_6

(c)    Cr(CO)_6

(d)   Mn_2(CO)_{10}

 

15. Total number of electron pairs in PCl_5 , PCI^+_4 \text{and} PCl^-_6 are respectively:

(a)    20, 16, 24

(b)   24, 16, 20

(c)    16, 20, 24

(d)   24, 20, 16

 

16. Which is the correct order of increasing dipole moment?

(a)    BrCl < NO< HCl < ClF < LiI

(b)   NO < BrCl < HCl < LiI < ClF

(c)    ClF < BrCl < NO < HCl < LiI

(d)   LiI < BrCl < HCl < ClF < NO

 

17. On the basis of electronic configuration of the metals and and oxygen which of the formulae of oxides are correct:

(a)    Rb_2O

(b)   Sr_2O

(c)    srO

(d)   Y_2O_3

(e)   A, C, D

 

18. Nitrate ion (NO^-_3) is planar and all bond angles are 120^0 : what atomic orbitals are used by N to bond O is NO_3:

(a)    Sp

(b)   sp^2

(c)    sp^3

(d)   None

 

19. The stability of the species NO_2, NO^+_2 \text{and} NO^-_2 is in the order:

(a)    NO^+_2 > NO_2 > NO^-_2

(b)   NO^-_2 > NO_2 > NO^+_2

(c)    NO_2 > NO^+_2 > NO^-_2

(d)   None of these

 

20. Which of the following statements is / are correct:

(a)    In molecule both dipole forces as well as dispersive forces exist

(b)   In H_2O molecule both hydrogen bonds as well as dispersive forces are present

(c)    In CCI_4 only dispersive forces exist

(d)   All are correct

Answers:

1.(b)             2.(a)               3.(c)             4.(b)             5.(d)
6.(a)             7.(d)              8.(b)              9.(c)             10.(a)
11.(a)           12.(c)             13.(c)              14.(b)          15.(a)
16.(a)           17.(e)             18.(b)             19.(a)           20.(d)



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