PPSC Chemistry Full Book Test With Answers

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PPSC Chemistry Full Book Test

Sr. # Questions Answers Choice
1 Metals are Transparent Tranalucant Opaque None of above
2 Metal are generally elements Electronegative Electropositive Neutral None of the above
3 Metal crystallize is system having co ordination number 8 12 14 any one of above
4 H-Bonding also ox in ling system like Protein DNA Botha A and B None of above
5 H-Bond has a preferred bonding direction like Ionic bond Covalent bond Co ordinate bond None of these
6 H-Bond has more energy than the van der Waals forces i.e. 1.0 kcal/mole 2.0 k cal/mole 10.0 kcal/mole 20. 0 kcal mole
7 Excluding H-atom , Hydrogen bond never involves more than atoms. One Two Three Four
8 Hydrogen bond is not electrostatic in nature is stated by Electrostatic approach Valence bond approach Molecular orbital approach None of the abvoe
9 In order to understand the nature of H , bond the theory has been suggested. Electrostatic approach Molecular orbital approach Valance bond approach All the above approaches
10 Example of inter molecular H-bonding is NH3 and H2O HF CH3COOH All of abvoe
11 Example of intra molecular hydrogen bonding. O-nitrophenol O-hydroxy benzaldehyde O- hydroxy benzoic acid All of the above
12 The bond order for BO molecule is. 2.5 3.0 2.0 3.5
13 The bond order gives the following valuable information. Stability of the molecules of ions Bond dissociation energy and bond length Magnetic properties All of the above
14 d2 sp3 is oriented in a manner Trigonal Tetrahedral Octahedral Trigonal bipyramidal
15 PCl5 is an example of hybridization d sp<sup>3</sup> d2 sp2 sp2 sp3
16 The bond along Sp2 hybridization is. 180<sup>o</sup> 120<sup>o</sup> 109.5<sup>o</sup> 160<sup>o</sup>
17 BCl3 is an example of hybridization sp sp2 sp3 None of above
18 A covalent bond which is formed between two atoms by the overlap of atomic orbitals along their axis is called. Pi bond Sigma bond Polar bond Non polar bond
19 Valence bond theory is also called as Electron pair theory Band theory Electron gas theory Electron pool theory
20 Pauling has suggested that the calculate of energy can be improved by considering. Screening effect Polarization effect Both A and B None of abvoe
21 Molecules have zero dipole moment CO2 BCl3 CH4 &amp; CCl4 All above
22 The polarity of bonds can lead to polarity of molecules and affect Melting point Boiling point Solubility All of above
23 The bond length is measured by X-ray diffraction Neutron diffraction Microwave spectroscopy All of above
24 The types of coordinate compounds. Labila Inert Both A and B None of above
25 Co ordinate compounds are Polar Non polar Dem polar None of above
26 Al2Cl6 is an example of Ionic bond Covalent bond Co ordinate bond Metallic bond
27 The acetylene molecule contain a Single bond Double bond Triple bond Co ordinate bond
28 A type of a chemical bond which is formed by the mutual sharing of electrons between combining atoms of the same or different elements is called. Ionic bond Covalent bond Co ordinate Covalent bond Metallic bond
29 Titanium dioxide shows the lattice strcuture. Flluorite Rutile Wurtzite Zeolite
30 The coordination number of closely packed hexagonal is. 4 6 8 12
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