What is the number of valence electrons for Oxygen?
8
6
2
1
Q.3.
Which one of the following statements is not correct for sigma and pi bonds between two carbon atoms?
Sigma bond is stronger than pi bond
Bond energies of sigma and pi bonds are of the order of 264 kJ /mol
Free rotation of atoms around a sigma bond is allowed but not in case of a pi bond
Sigma bond is formed from hybridised orbital and pi bond is formed from unhybridised orbital.
Q.4.
Which of the following is the AXE notation for OF2?
AX2E0
AX2E1
AX2E2
AX2E3
Q.5.
What is the AXE Notation for SeO3?
AX3E0
AX3E1
AX3E2
AX3E3
Q.6.
Which compound would have a very low melting point?
sodium chloride
copper (II) sulfate
sulfur dioxide
aluminum
Q.7.
Which of the following types of elements can exist in nature as diatomic molecules?
alkali metals
transition metals
halogens
noble gases.
Q.8.
Which sub-atomic particle is involved in chemical bonding?
Proton
Neutron
Electron
Valence Electron
Q.9.
Which molecule exhibits resonance?
O3
BeCl2
CO2
NF3
Q.10.
What is the hybridisation for central atom in IF4-?
sp2
sp3
sp3d
sp3d2
Q.11.
Which of the following is not the basic molecular geometry shape of molecule.
Tetrahedral
Trigonal Planar
Bent
Trigonal Bipyramidal
Linear
Q.12.
When an atom of sodium and an atom of fluorine combine, an ionic bond is formed. Which statement correctly describes the behavior of the valence electron in the ionic bond?
An electron from the fluorine atom moves to the sodium atom forming two ions
An electron from the sodium atom moves to the fluorine atom forming two ions
An electron from the fluorine atom is shared with the sodium atom forming one cation
An electron from the sodium atom is shared with the fluorine atom forming one anion
Q.13.
When an element in groupcombines with an element in group 5A, they produce a compound. What is the correct bonding ratio between these elements?
2:3
3:2
2:5
5:2
Q.14.
What are the formal charges on the boron and nitrogen in the compounds BF3 and NH3?
-2 and +2
+2 and –2
0 and 0
+1 and –1
Q.15.
VSEPR stands for ________ theory.
Valence Structure of Electron Pyramids and Regression
Varied Structures of Electrons Paired and Replaced
Varied Shell Energy of Protons and Radiation
Valence Shell Electron Pair Repulsion
Q.16.
VSEPR is based on the assumption that
positive ions repel each other
positive ions attract negative ions
sp2 hybridization occurs
electrons in molecules repel each other
Q.17.
Under standard conditions, water exists as a liquid, but His a gas. This difference in phase can be explained by:
The hydrogen bonding between molecules in water
The hydrogen bonding between molecules in H2S
The greater molecular mass of H2S
The greater atomic radii of H2S
Q.18.
Two elements X and Y, have electronic configurations 1s22s22p63s2 and 1s22s22p63s23p5 respectively.Which statements describe the compound formed by X and Y?I : It is soluble in waterII : It has high melting and boiling pointsIII : It has a crystal lattice structure.IV : The elements can be recovered by using electricity.
I and II only
I, II and III only
II, III and IV only
I, II, III and IV
Q.19.
Three elements, X, Y and Z have consecutive increasing proton numbers. If element Y is a noble gas, what will be the formula of the compound formed by X and Z?
ZX
ZX7
Z7X
Z2X
Q.20.
The types of hybrid orbitals of nitrogen in NO2+,NOand NHrespectively are expected to be
Sp, Sp3, Sp2
Sp, Sp2, Sp3
Sp3, Sp ,sp2
Sp2,sp3,Sp
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