Sunday, July 6, 2008

Chemical Bonding - Multiple Choice Questions

1. The ion that isoelectronic with CO is

a. CN-
b. O2+
c. O2-
d. N2+
(JEE 1982)

ans: (a)

isoelectronic means same number of electrons

2. carbon tetrachloride has no net dipole moment because of

a. its planar structure
b. its regular tetrahedral structure
c. similar sizes of carbon and chlorine atoms
d. similar electron affinities of carbon and chlorine
(JEE 1983)

ans (b)

3. which one among the following does not have the hydrogen bond?

a. phenol
b. liquid NH3
c. water
d. liquid HCl
(JEE 1983)

Ans: (d)

4. the types of bonds present in CuSO4.5H2O are only

a. electrovalent and covalent
b. electrovalent and coordinate covalent
c. electrovalent, covalent and coordinate covalent
d. covalent and coordinate covalent

5. On hybridization of one s and one p orbitals we get:

a.two mutually perpendicular orbitals
b. two orbital at 180°
c. four orbitals directed tetrahedrally
d. three orbital in a plane
(JEE 1984)

Answer: (b)

6. the molecule having one unpaired electron is:

a. NO
b. CO
c. CN-
d. O2
(JEE 1985)

Ans: (a)

7. The bond between two identical non-metal atoms has a pair of electrons:

a. unequally shared between the two.
b.transferred fully from one atom to another
c. with identical spins
d. equally shared between them
(JEE 1986)

Ans: (d)

8. the hydrogen bond is strongest in:

a. O-H…S
b. S-H…O
c. F-H…S
d. F-H...O
(JEE 1986)

Answer: ( c )

9. The hybridization of sulphur dioxide is:

a. sp
b. sp²
c. dsp²
d. sp³
(JEE 1986)

answer (b)

10. The bonds present in N2O5 are ______

a. only ionic
b. covalent and coordinate
c. only covalent
d. covalent and ionic
(JEE 1986)

ans: (b)

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