Q.1
Among the following compounds the one that is polar and has the central atom with sp2 hybridization is ...{IIT 1997]
  • a)H2CO3
  • b) SiF4
  • c)BF3
  • d)HClO2
Q.2
Which concept best explains the fact that o-nitrophenol is more volatile than p-nitrophenol? [ AIIMS 1994]
  • a) resonance
  • b) hyperconjugation
  • c) hydrogen bonding
  • d) steric hindrance
Q.3
The metallic luster exhibited by sodium is explained by .. [ Pb. CET 1998]
  • a) diffusion of sodium ions
  • b) excitation of free protons
  • c)oscillation of loose electrons
  • d)existence of body centered cubic lattice
Q.4
The high density of water compared to ice due to .. [ CBSE PMT 1997]
  • a) H -bonding interactions
  • b) dipole -dipole interactions
  • c)dipole-induced dipole interactions
  • d)induced dipole induced dipole interaction
Q.5
According to VSEPR theory, the most probable shape of the molecule having 4 electrons pair in the outer shell of the central atom is ... [ MP PET 1996]
  • a)Linear
  • b) Tetrahedral
  • c)Hexahedral
  • d)Octahedral
Q.6
In PO43-, the formal charge on each oxygen atom and P-O bond order respectively are .. [ CBSE 1998]
  • a) -0.75 , 0.6
  • b)-0.75 , 1.0
  • c) -0.75, 1.25
  • d) -3.0, 1.25
Q.7
According to Fajan's rule covalent bonding is favoured between ... [ BHU 1994]
  • a) small cation and large anion
  • b) small cation and large anion
  • c)large cation and large anion
  • d)large cation and small anion
Q.8
Which of the following has the highest dipole moment? [ CBSE PMT 1997]
  • a) AsH3
  • b) SbH3
  • c)PH3
  • d)NH3
Q.9
The maximum number of water molecules that one water molecule can bond through hydrogen bond is ... [ IIT 1992]
  • a)2
  • b) 4
  • c)6
  • d)8
Q.10
Which of the following statement is not correct [ AIIMS 1982]
  • a) Hybridization is the mixing of atomic orbitals prior to their combining into molecular orbitals
  • b) sp2 hybrid orbitals are formed from two p-atomic orbitals and one s-orbital
  • c) dsp2 hybrid orbitals are all at 90° to one another
  • d) s2sp3 hybrid orbitals are directed towards the corners of a regular octahedron
Q.11
CO2 is isostructural with which of the following? [ MP PMT 1995]
  • a) HgCl2
  • b) H2O
  • c)SnCl2
  • d)NO2
Q.12
The structure of PF5 molecule is ... [ AFMC 1995]
  • a) Tetrahedral
  • b) Square planar
  • c)Trigonal bipyramidal
  • d)pentagonal bipyramidal
Q.13
An element (X) forms compounds of the formula XCl3, X2O5 and Ca3X2 but does not form XCl5 Which of the following is the element X .. [ MP PMT 1998]
  • a)B
  • b) Al
  • c)N
  • d)P
Q.14
Density of ice is hess than that of water because of .... [ BHU 1994]
  • a) Extensive hydrogen bonding
  • b) Crystal modification of ice
  • c)Open porous structure of ice due to hydrogen bonding
  • d)different physical states of these
Q.15
A metallic bond is .. [ Pb CET 1998]
  • a)ionic
  • b) Polar covalent
  • c)Non-polar covalent
  • d)Electrostatic in nature
Q.16
mong the following orbital bond angle is minimum between [ CBSE PMT 1994]
  • a) sp3
  • b) px and py
  • c) H - O - H in water
  • d) sp bonds
Q.17
The bond order of NO molecule is ... [ MP PMET 1996]
  • a) 1.5
  • b) 2.0
  • c)2.5
  • d)3.0
Q.18
The number of sigma( σ) bonds in 1-butene is ... [ MP PMT 1995]
  • a) 8
  • b) 10
  • c)11
  • d)12
Q.19
The geometry of ClO3- ion according to Valance shell electron pair repulsion theory will be{MP PRET 1998]
  • a)Planar triangular
  • b) Pyramidal
  • c)Tetrahedral
  • d)Square planar
Q.20
NH3 has higher boiling point than expected because ... [ Pb CET 1985]
  • a) It forms NH4OH with water
  • b) It has strong intermolecular hydrogen bonds
  • c) It has intramolecular hydrogen bonds
  • d) Its density decreases on freezing
Q.21
What happens if CCl4 is treated with AgNO3 ... [ DPMT 1994]
  • a)A white ppt. of AgCl will form
  • b) NO2 will evolved
  • c)CCl4 will dissolved in AgNO3
  • d)Nothing will happen
Q.22
The type of bonding in HCl molecule is [ AIIMS 1992]
  • a) Pure covalent
  • b) Polar covalent
  • c)Highly polar
  • d)Hydrogen bonding
Q.23
hich of the following has the least bond angle? [ Pb CET 1991]
  • a)BeF2
  • b) H2O
  • c)NH3
  • d)CH4
Q.24
Which statement is not correct? [ CBSE PMT 1990]
  • a) A sigma bond is weaker than a π-bond
  • b) A sigma bond is stronger than a π bond
  • c) A double bond is stronger than a single bond
  • d) A double bond is shorter than a single bond
Q.25
Among the following, which compound will show the highest lattice energy? [ CBSE PMT 1993]
  • a) KF
  • b)NaF
  • c)CsF
  • d)RbF
Q.26
Which of the following has the shortest carbon carbon bond length? [ CBSE PMT 1991]
  • a) Benzene
  • b) Ethene
  • c)Ethyne
  • d)Ethane
Q.27
The octet rule is not valid for the molecule ... [ JIPMER 1994]
  • a)CO2
  • b) H2O
  • c)O2
  • d)CO
Q.28
The M.O. configuration of He2+1 will be
  • a) σ1s2, σ*1s2,σ2s2, σ*2s1
  • b) σ1s2, σ*1s2,σ2s2, σ*2s2
  • c) σ1s2, σ*1s2,σ2s2
  • d) σ1s2, σ*1s1
Q.29
Ethanol and methoxymethane boils at a lower temperature because it has ... [ DEC 1994]
  • a) low density
  • b) no hydrogen bonding
  • c)molecular association
  • d)oxygen atom attached to two methyl groups
Q.30
In which of the following, the central atom does not use sp3 hybrid orbitals in its bonding? [ MLNR 1992]
  • a) BeF3-
  • b) OH3+
  • c)NH2-
  • d)NF3
0 h : 0 m : 1 s