ECAT Chemistry MCQ's Test For Full Book With Answers

ECAT Chemistry MCQ's Test For Full Book

Sr. # Questions Answers Choice
1 Which of the following liquids has low vapour pressure at 250C Diethyl ether Acetone Water Ethyl alochol
2 Escape of high energy molecules from the surface of a liquid is called Sublimation Distillation Condensation Evaporation
3 A liquid on evaporation causes Heating effect Cooling effect Suffication All of above
4 At sea level and at 1000C the vapour pressure of water in an open system is 1000 mm Hg 760 mm Hg 730 mm Hg 670 mm Hg
5 Rate of evaporation and rate of condensation at equilibrium Become very low Become very high Become equal Can never be equal
6 Evaporation of water is possible at Above 100<sup>0</sup> 0<sup>0</sup> 100<sup>0</sup> At all temperature
7 H2S is a gas which H2O is liquid at room temperature. it is due to Less intermolecular forces in water Covalent bond in H-O in water molecule Hydrogen bonding in water molecules Ionic characters in water molecules
8 Hydrogen bonding is present between the molecules of NH<sub>3</sub> H<sub>2</sub>O HF All of above
9 Debye forces are present in one of the following pairs Na<sup>+</sup>ion and water Argon and water Argon and Na<sup>+</sup>ion Ne and Water
10 The strongest forces are Debye forces London dispersion forces Dipole-dipole attraction Hydrogen
11 Polypeptide chains are coiled about one another into a spiral by Ionic bonds Covalent bonds Van der Waal's forces Hydrogen bonds
12 HF has exceptionally low acidic strengths due to Smaller size of fluorine Strong polar bond between H and F Electronegativity of fluorine Strong hydrogen bonding
13 Hydrocarbon molecules with large chain lengths experience Weaker attractive forces Stronger attractive forces Repulsive forces No attractive forces
14 In a group on going downward, polarizability generally Decreases Increases Remains constant Negligible
15 London dispersion forces are also called Hydrogen bonding Debye forces Van de Waal's forces Instantaneous dipole-induced dipole forces
16 The intermolecular forces in liquids are Negligible Very weak Very strong Reasonably strong
17 The gases can be converted into liquids by increasing the pressure only Lowering temperature and increasing pressure Increasing pressure and bringing temperature below critical point Lowering temperature only
18 Which one of the following is the weakest intermolecular force Dipole induced dipole forces Ionic dipole forces Electrostatics forces between ions Dipole-dipole forces
19 The density of water decreases, when it is freezed at 0oC because of Change of bond lengths Change of bond angles Cubic structure of ice Empty spaces present in the structure of Ice
20 The only forces are London dispersion forces among the Atoms of He in gaseous state at high temperature Molecules of water in liquid state Molecules of solid I<sub>2</sub> Molecular of hydrochloric acid gas
21 Force of attraction between atoms of He is London dispersion forces Hydrogen bondign Coordinate covalent bond Covalent bond
22 Chloroform and acetone are soluble in each other due to Instantaneous dipole interactions Dipole-dipole interactions Intermolecular hydrogen bonding All of above
23 Diamond is a bad conductor because It has a tight structure It has a high density there is no free electron present in the crystal of diamond of conduct electicity Is transparent to light
24 Which of the following is a pseudo solid CaF<sub>2</sub> Glass NaCl All
25 The molecules of CO2in dry ice from the Ionic crystalls Covalent crystals Molecular crystals Any type of crystal
26 Amorphous solids Have sharp melting point Undergo clean cleavage when cut with knife Have perfect arrangement of atoms Can possesses small regions of orderly arrangement of atoms
27 Ionic Solids are characterized by Low melting points Good conductivity in solid state High vapour pressure Solubility in polar solvents
28 At constant temperature when pressure of a gas is plotted against volume, the curve is Slanting straight line Parabolic Staight line, parallel to pressure axis OF neither type
29 Keeping the temperature constant, if the gas is expanded kinetic energy of molecules will increase Number of gas molecules increases Temperature will increases Pressure will decrease
30 The highest temperature at which a substance can exist as a liquid is called its Critical temperature Zero temperature Absolute temperature None of above
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