PPSC Chemistry Full Book Test With Answers

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PPSC Chemistry Full Book Test

Sr. # Questions Answers Choice
1 Which one of following is paramagnetic and has the bond order equal to 0.57 N2 H2+ O2 F2
2 Of the molecules, SF4, XeF4, and CF which has square planar geometry. SF4, XeF4 and CF4 Sf4 only CF4 only XeF4
3 Which of the following is planar? CH2Cl2 CHCl3 CCl4 C2H2
4 Which of the following does not apply to metallic bond. Overlapping valence orbitals Mobile valency electron Delocalized electrons Highly directed bonds
5 Strength of H bond in inter mediate between Van der Waals forces and covalent bond Ionic and covalent bond Ionic and metallic bond Metallic and covalent
6 An sp3 hybrid orbital contains 1/4 a character 1/2 a character 2/3 a character 3/4 a character
7 Bond angle is minimum in H2O CO2 NH3 CH4
8 Among LiCl, BeCl2, BCl3, and CCl4 the covalent bond character follows the order. LiCl < Becl2< Bcl3 < CCl4 LiCl > BeCl2 < BCl3<CCl4 LiCl< Becl2 < BCl3 < CCl4 LiCl > Becl2 > BCl3 < CCl4
9 The pair of molecules or ions having identical geometry is. BCl3, PCl3 BF3, NH3 CHCl3, CCl4 SiCl4, CCl4
10 Which of the following bonds will be non polar. N - H O - H C - H C l - Cl
11 In which of the following compounds does hydrogen bonding occur. CCl4 NaH HI NH3
12 NH3 has a not dipole moment while BF3 has zero dipole moment Thsi is because. NH3 is not a planar molecule while BF3 is a planar molecule. NH3 is a planar molecule, while BF3 is a planner molecule. Fluorine is more electronetative than nitrogen Born is more electronegative than nitrogen
13 The element having electronic configuration 1s2, 2s2, 3s2, 3p3 is. Trivalent only Tetravalent only Trivalent and pentavalent Pentavalent only
14 The percentage of s-character in the hybrid orbitals sp, sp2 and sp3 follows the pattern. sp3 > sp2 > sp sp > sp2 > sp3 sp = sp2 >sp3 sp = sp2 =sp3
15 The state of hybridization of carbon in CO2 is sp2 sp sp3 dsp2
16 Which one of the following does not exhibit paramegnetion. NO NO2 CiO2 CIO-2
17 Which of the following ahs non zero dipole moment. NH3 SF6 BF3 CO2
18 The type of bonding in HCl is Pure covalent Polar covalent Highly polar Hydrogen bonding
19 Which one has a co ordinate bond. Al2Cl6 BF3 NaCl O2
20 Which of the following proportion is associated with the covalent nature of the compound. It conducts electricity in molten stater or aqueous state It is a non electrolyte It has high m.p. It is a compound of a metal and non metal.
21 The unequal sharing of bonded pair of electrons between the two atoms in a molecule causes. Dipole Radical formation Decomposition of found Covalent found
22 CCl4 has zero dipole moment because of. Planar structure Tetrahedral structure Similar size of C and Cl atoms Similar electrons affinity of C and Cl
23 The important condition for the formation of chemical bond is that. Their electron clouds should not diffuse Both atoms should have high electron affinites. Both atoms should have same electronegativities The process should be accompanied by the lowering in potential energy.
24 Example of linear geometry XeF2 F2 and HgCl2 CdI2 AND Ag Cl3 All of the above
25 The gap between occupied and the unoccupied orbitals is not very large and the conduction of electricity is negligible at lower temperature and appreciable at high temperatures then it will be. Good conductor Non conductor Semi conductor None of the above
26 The energy gap between two bands so large that it effectively prevents the promotion of electron from the lower to the higher band such energy gap all called. Ionization zone Dissociation zone Distinction zone Forbidden zone
27 A combination of atomic orbitals produces a large number of closely special energy states brown as. Packet of energy Band of energy Botha a and b None of the above
28 Metallic bond is treated essentially as in character Ionic Covalent Polar Non polar
29 Electron gas theory fails to explain Specific heat of metals Electrical and thermal conductivity Paramagnetic behavior of metals All of the above
30 Electron gas theory is able to explain Metallic lusture and optical properties Malleability and ductility High electrical and thermal conductivity All of the above
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