PPSC Chemistry Full Book Test With Answers

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PPSC Chemistry Full Book Test

Sr. # Questions Answers Choice
1 The pH of the tears is 7.0 7.4 7.8 8.2
2 The concentration of OH- ions in a certain household ammonia solution is 0.0025. This ammonia solution is. Basic Acidic Neutral None of above
3 The value of Kw increase with temperature because the ionization of water. Positive Negative Endothermic Exothermic
4 The ionic product equilibrium constant is. Ka Kb Kc Kw
5 pH of pure water at 25 oC. kw = 1 x 10-4 0 7 14 None of above
6 A chemical reaction resulting in a change in the electric charge on the reacting particles may be called as. Add ion reaction Redox reaction Elimination reaction Chain reaction
7 Relative order of acidity of oxy acid HCIO > HCIO2 > HCIO3 > HCIO4 HCIO4 > HCIO3 >HCIO2 > HCIO HCIO3 > HCIO2 > HCIO > HCIO4 HCIO2 > HCIO4 > HCIO3 > HCIO
8 Relative order of acidity of HF, HCl, HBr, and HI acids is HCl > HBr > HI > HF HF > HCl > HBr > HI HI > HBr > HCl >HF HF > HI > HCl > HBr
9 All the strong acids have very close pKas value and they appear to have nearly equal strengths in aqueous solutions. The phenomenon is called as. Levelling effect Differnetiating effect Levelling solvent Differnetiating solvent
10 The one in which the acceptor atom is of low positive charge, Large size and has several outer electrons which can be easily excited is a. Soft base Hard Base Soft acid Hard acid
11 According to SHAH concept the Lewis bases were classified on the basis os. Charge ion size Polarization consideration Electron and co coordinating ability All of above
12 According to SHAB, Lewis acid are divided into. Two classes Three classes Four classes None of above
13 According to Usanovich concept a base is defined as any species. Capable of giving up anions Combining with cations Neutralizing an acid to give a salt All of above
14 Lux -Flood concept is a dono-acceptor system of. Proton Electron pair Neurtron Oxide ion
15 Lewis concept explain the formation of Ionic bond Covalent bond Co-ordinate bond Chemical bond
16 Bases and reducing agents are electron giving agents and also called as. Electrodotic Electrophile Nucleophile None of above
17 The concept is also known as electron pair donor acceptor system. Bronsted Lowery Lewis Lux -Flood Usanovich
18 The concept is also known as proton donor acceptor system. Bronsted Lowery Lewis Lux Flood Usanovich
19 Arrhenius concept explained Constant heat of neutralization Quantitative determination of acid base strength Catalytic property of acid All above
20 "Acids are substance whose aqueous solutions turned blue litmus red and tasted sour" stated by Davy Liebig Boyle Rouelle
21 How many sigma and pi bonds are there in a CO2 molecule. 2 sigma 2 sigma and 4 pi 2 sigma and 2 pi 4 sigma and no pi
22 Which of the following interaction is the strong. Dipole -dipole Ion induced dipole Ion -dipole Dipole induced diple
23 Covalent compound are soluble in Polar solvents Non polar solvent Concentrated acids All solvent
24 The maximum covalence of an element equal to. The number of unpaired d electrons The number of paired p electrons The number of unpaired a and P electors The actual number of a and P electrons in the outermost shell
25 Arrange the following in order of increasing boiling point. CH3OH < CH3Cl < RbCl < CH4 CHOH < CH4 < CH3Cl < RbCl RbCl < CH3Cl < CH3OH < CH4 CH4 < CH3Cl < CH3OH < RbCl
26 Which of the following statements is worng. Covalent compounds are generally soluble is polar solvents Covalent compounds have low melting and boiling point. Ionic solids do not conduct electricity is solid state Ionic compounds conduct electricity in the fused state.
27 Which of the following statements is wrong. Covenant compounds are generally soluble is polar solvents. Covalent compounds have low melting and boiling points Lower than that of separate H atoms Sometimes lower and sometimes higher than that of separate H
28 Which two atoms of hydrogen combine to form a molecule of hydrogen gas. the energy of the hydrogen molecule is. Higher than that of separate H atoms Equal to that of separate H atoms Lower than that of separate H atoms Sometimes lower and sometimes higher than that of separate H.
29 The boiling point of water is unexpectedly high because. H2O molecule in linear Sp3 hydrogen bonding is involved in the formation of water There is hydrogen bonding and consequent association of H2O molecules. Oxygen is the first member of the VI group
30 Which of the following statements regarding covalent bond is false. The electrons are shared between atoms. The bond in non -directional The strength of the bond depend upon the extent of overlapping The bond formed may be polar or non-polar
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