IIT JEE MCQ Quiz Hub

1. The partial ionic character of HCl is due to difference in
ionisation potential
electronegativity
electron affinity
None of these

2. Which of the following groups of atoms gain electrons readily?
N P As
Li Na K
Cl Br I
Ca Sr Ba

3. Hydrogen bond is formed in compounds containing hydrogen and
negatively charged species
positively charged species
highly electronegative atom
highly electropositive atom

4. When a molecule is formed by the combination of atoms
only repulsive forces operate
only attractive forces operate
none of these forces operate
both A and B operate

5. Molecular orbital theory was developed by
Rutherford
Millikan
Planck
Bohr

6. Bond order is given by
3(na-nb)
3(nb+na)
2(nb-na)
(nb-na)/2

7. Which of the following bonds will be non polar?
N-H
C-H
F-F
Cl-Cl

8. The atomic number of element which shows oxidation state of +3 is
13
16
23
18

9. The most covalent halide of aluminium is
aluminium chloride
aluminium iodide
aluminium fluoride
aluminium bromide

10. Sulphuric acid molecule contains
covalent and ionic bonds
only ionic bonds
only covalent bonds
covalent and co-ordinate bonds

11. Which combination of atomic orbitals is not allowed according to MO theory?
Px - Px
Px - Py
Py - Py
Pz - Pz.

12. The molecule of ICI is
polar with negative end at iodine
polar with negative end at chlorine
purely electrovalent
purely covalent

13. Nitrogen atom has 7 protons 7 electrons and 7 neutrons. The nitride ion has
7 protons 7 neutrons 9 electrons
8 protons 6 neutrons 4 electrons
5 protons 6 neutrons 7 electrons
7 protons 7 neutrons 10 electrons

14. Which of the following bond is most polar?
C-H
N-H
S-H
O-H

15. he half of the difference between the number of electrons in bonding and antibonding MOs is called
molecular order
bond order
electronic order
bonding capacity.

16. What is not true for resonance?
Cannonical forms differ only in electronic arrangement
Cannonical forms differ in atomic as well as electronic arrangement
Cannonical forms have same number of unpaired electrons
Cannonical forms are hypopthetical.

17. In a homonuclear molecule higher the bond order larger will be
bond length
bond strength
paramagnetism
ionic character.

18. KCl readily dissolves in water because
it is a salt of potassium
it is ionic compound
it reacts with water
it has appreciable covalent character.

19. Tetrahedral bonding of carbon atoms was first shown by
Vant Hoff and Le Bel
Planck
Lewis
Buffer

20. C-H bond distance is smallest in
methane
ethene
ethyne
ethane.

21. Which of the following pairs of compound will not form H-bonds with each other?
Ethanol-methanol
Ethanol-water
Chloroform-acetone
Carbon tetrachloride-acetone.

22. Which overlap would result the strongest bond?
s-s
sp-sp
s-p
p-p

23. Covalent molecules are generally held in the crystal structures by
Van der Waals forces
electrostatic forces
covalent bonds
dipolar forces

24. A factor that does not favour the formation of cation from the atom M is
high charge on resulting cation
large size of the atomic radius
low ionisation energy
low charge on anion

25. According to Fajan rules the covalent character is most favored in
Small cation large anion
Small cation small anion
Large cation large anion
Large cation small anion.

26. During bond formation normally all the elements in their outermost shell acquire
three electrons
ten electrons
eight electrons
sixteen electrons

27. VSEPR Theory was proposed by
Lewis
Lewis and Kossel
Nyhom and Gillipsie
Linus Pauling.

28. Formic acid exists as dimer because
hydrogen bonds hold the molecules together
two molecules exists as a resonance
two molecules exist as a single unit
None of the above

29. The number of electrons being shared in nitrogen molecule is
4
2
8
6

30. Which of the following phenomenon will occur when two atoms of the elements having same spin of electron approach for bonding?
Orbital overlap will not occur
Bonding will not occur
Both (a) (b) are correct
None of the above are correct.

31. In the co-ordinate bond the acceptor atom must essentially contain in its valence shell an orbital with
no electron
single electron
two unpaired electrons
None of these

32. Which out of the following has the highest melting point?
Cesium fluoride
Ammonia
Chloroform
Helium

33. Fused ionic compounds
are used as semi-conductors
conduct electricity
are insulators
none of the above

34. The aqueous solution of which of the following substances will be able to conduct electricity?
Glycerol
Sucrose
HI
Ethanol.

35. What is not true about hybridization?
Hybrid orbitals form relatively stronger bonds than pure atomic orbitals
Hybrid orbitals form sigma bonds
Orientation of hybrid orbitals depends upon the type of hybridization
Promotion of electron from lower sub-level to higher sub-level of the valence shell is essential for hybridization.

36. Linear combination of two hybridized orbital belonging to two different atoms results in the formation of
sigma bond
pi bond
delta bond
double bond.

37. The shortest carbon carbon bond distance is found in
acetylene
propane
ethane
diamond

38. Ice and water differ from each other in
elemental composition
molecular formulae
extent of H-bonding
nature of interparticle forces.

39. Which of the following molecule has dipole moment greater than zero?
3 3-Diethylpentane
trans-2-pentene
2 2 3 3-tetramethyl butane
Neopentane.

40. Which of the following theory provides explanation about paramagnetic nature of oxygen?Electronic theory of valency

Valency bond theory
Molecular orbital theory
All of the above.

41. Which of the following does not conduct electricity?
Molten NaOH
Molten KOH
solid NaCl
Aqueous NaCl.

42. The carbon-carbon link in acetylene contains
One sigma and two pi bonds
Two sigma and three pi bonds
Two sigma and two pi bonds
Three sigma bonds.

43. Paramagnetism is exhibited by molecules whichc
are not attracted by magnetic field
contain only paired electrons
contain unpaired electrons
arry positive charge.

44. In diamond the bonds present are
ionic covalent
covalent dative
electrovalent dative
covalent only.

45. Which one of the following bonds is weakest?
ionic bond
covalent bond
metallic bond
van der Waal forces.

46. The bond order of NO molecules is
1.5
2
2.5
3