[{"id":151371,"question":"Which of the following liquids has low vapour pressure at 25<sup>0</sup>C","choices":[{"text":"Diethyl ether","value":"A"},{"text":"Acetone","value":"B"},{"text":"Water","value":"C"},{"text":"Ethyl alochol","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":151370,"question":"Escape of high energy molecules from the surface of a liquid is called","choices":[{"text":"Sublimation","value":"A"},{"text":"Distillation","value":"B"},{"text":"Condensation","value":"C"},{"text":"Evaporation","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":151369,"question":"A liquid on evaporation causes","choices":[{"text":"Heating effect","value":"A"},{"text":"Cooling effect","value":"B"},{"text":"Suffication","value":"C"},{"text":"All of above","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":151368,"question":"At sea level and at 100<sup>0</sup>C the vapour pressure of water in an open system is","choices":[{"text":"1000 mm Hg","value":"A"},{"text":"760 mm Hg","value":"B"},{"text":"730 mm Hg","value":"C"},{"text":"670 mm Hg","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":151367,"question":"Rate of evaporation and rate of condensation at equilibrium","choices":[{"text":"Become very low","value":"A"},{"text":"Become very high","value":"B"},{"text":"Become equal","value":"C"},{"text":"Can never be equal","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":151366,"question":"Evaporation of water is possible at","choices":[{"text":"Above 100<sup>0</sup>","value":"A"},{"text":"0<sup>0</sup>","value":"B"},{"text":"100<sup>0</sup>","value":"C"},{"text":"At all temperature","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":151365,"question":"H<sub>2</sub>S is a gas which H<sub>2</sub>O is liquid at room temperature. it is due to","choices":[{"text":"Less intermolecular forces in water","value":"A"},{"text":"Covalent bond in H-O in water molecule","value":"B"},{"text":"Hydrogen bonding in water molecules","value":"C"},{"text":"Ionic characters in water molecules","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":151364,"question":"Hydrogen bonding is present between the molecules of","choices":[{"text":"NH<sub>3</sub>","value":"A"},{"text":"H<sub>2</sub>O","value":"B"},{"text":"HF","value":"C"},{"text":"All of above","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":151363,"question":"Debye forces are present in one of the following pairs","choices":[{"text":"Na<sup>+</sup>ion and water","value":"A"},{"text":"Argon and water","value":"B"},{"text":"Argon and Na<sup>+</sup>ion","value":"C"},{"text":"Ne and Water","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":151362,"question":"The strongest forces are","choices":[{"text":"Debye forces","value":"A"},{"text":"London dispersion forces","value":"B"},{"text":"Dipole-dipole attraction","value":"C"},{"text":"Hydrogen","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":151361,"question":"Polypeptide chains are coiled about one another into a spiral by","choices":[{"text":"Ionic bonds","value":"A"},{"text":"Covalent bonds","value":"B"},{"text":"Van der Waal's forces","value":"C"},{"text":"Hydrogen bonds","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":151360,"question":"HF has exceptionally low acidic strengths due to","choices":[{"text":"Smaller size of fluorine","value":"A"},{"text":"Strong polar bond between H and F","value":"B"},{"text":"Electronegativity of fluorine","value":"C"},{"text":"Strong hydrogen bonding","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":151359,"question":"Hydrocarbon molecules with large chain lengths experience","choices":[{"text":"Weaker attractive forces","value":"A"},{"text":"Stronger attractive forces","value":"B"},{"text":"Repulsive forces","value":"C"},{"text":"No attractive forces","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":151358,"question":"In a group on going downward, polarizability generally","choices":[{"text":"Decreases","value":"A"},{"text":"Increases","value":"B"},{"text":"Remains constant","value":"C"},{"text":"Negligible","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":151357,"question":"London dispersion forces are also called","choices":[{"text":"Hydrogen bonding","value":"A"},{"text":"Debye forces","value":"B"},{"text":"Van de Waal's forces","value":"C"},{"text":"Instantaneous dipole-induced dipole forces","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":151356,"question":"The intermolecular forces in liquids are","choices":[{"text":"Negligible","value":"A"},{"text":"Very weak","value":"B"},{"text":"Very strong","value":"C"},{"text":"Reasonably strong","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":151355,"question":"The gases can be converted into liquids by","choices":[{"text":"increasing the pressure only","value":"A"},{"text":"Lowering temperature and increasing pressure","value":"B"},{"text":"Increasing pressure and bringing temperature below critical point","value":"C"},{"text":"Lowering temperature only","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":151354,"question":"Which one of the following is the weakest intermolecular force","choices":[{"text":"Dipole induced dipole forces","value":"A"},{"text":"Ionic dipole forces","value":"B"},{"text":"Electrostatics forces between ions","value":"C"},{"text":"Dipole-dipole forces","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":151353,"question":"The density of water decreases, when it is freezed at 0<sup>o</sup>C because of","choices":[{"text":"Change of bond lengths","value":"A"},{"text":"Change of bond angles","value":"B"},{"text":"Cubic structure of ice","value":"C"},{"text":"Empty spaces present in the structure of Ice","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":151352,"question":"The only forces are London dispersion forces among the","choices":[{"text":"Atoms of He in gaseous state at high temperature","value":"A"},{"text":"Molecules of water in liquid state","value":"B"},{"text":"Molecules of solid I<sub>2</sub>","value":"C"},{"text":"Molecular of hydrochloric acid gas","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":151351,"question":"Force of attraction between atoms of He is","choices":[{"text":"London dispersion forces","value":"A"},{"text":"Hydrogen bondign","value":"B"},{"text":"Coordinate covalent bond","value":"C"},{"text":"Covalent bond","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":151350,"question":"Chloroform and acetone are soluble in each other due to","choices":[{"text":"Instantaneous dipole interactions","value":"A"},{"text":"Dipole-dipole interactions","value":"B"},{"text":"Intermolecular hydrogen bonding","value":"C"},{"text":"All of above","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":151349,"question":"Diamond is a bad conductor because","choices":[{"text":"It has a tight structure","value":"A"},{"text":"It has a high density","value":"B"},{"text":"there is no free electron present in the crystal of diamond of conduct electicity","value":"C"},{"text":"Is transparent to light","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":151348,"question":"Which of the following is a pseudo solid","choices":[{"text":"CaF<sub>2</sub>","value":"A"},{"text":"Glass","value":"B"},{"text":"NaCl","value":"C"},{"text":"All","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":151347,"question":"The molecules of CO<sub>2</sub>in dry ice from the","choices":[{"text":"Ionic crystalls","value":"A"},{"text":"Covalent crystals","value":"B"},{"text":"Molecular crystals","value":"C"},{"text":"Any type of crystal","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":151346,"question":"Amorphous solids","choices":[{"text":"Have sharp melting point","value":"A"},{"text":"Undergo clean cleavage when cut with knife","value":"B"},{"text":"Have perfect arrangement of atoms","value":"C"},{"text":"Can possesses small regions of orderly arrangement of atoms","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":151345,"question":"Ionic Solids are characterized by","choices":[{"text":"Low melting points","value":"A"},{"text":"Good conductivity in solid state","value":"B"},{"text":"High vapour pressure","value":"C"},{"text":"Solubility in polar solvents","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":151344,"question":"At constant temperature when pressure of a gas is plotted against volume, the curve is","choices":[{"text":"Slanting straight line","value":"A"},{"text":"Parabolic","value":"B"},{"text":"Staight line, parallel to pressure axis","value":"C"},{"text":"OF neither type","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":151343,"question":"Keeping the temperature constant, if the gas is expanded","choices":[{"text":"kinetic energy of molecules will increase","value":"A"},{"text":"Number of gas molecules increases","value":"B"},{"text":"Temperature will increases","value":"C"},{"text":"Pressure will decrease","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":151342,"question":"The highest temperature at which a substance can exist as a liquid is called its","choices":[{"text":"Critical temperature","value":"A"},{"text":"Zero temperature","value":"B"},{"text":"Absolute temperature","value":"C"},{"text":"None of above","value":"D"},{"value":"E"}],"correctAnswer":1}]