221 The ttractive forces between the partial positive end of one molecule and partial negative end of other molecule are called________________? Chemistry Medium Full question → A Dipole-dipole forces B Ion dipole-dipole forces C London dispersion forces D Debye forces
222 Formation of vapours from the surface of a liquid is called________________? Chemistry Medium Full question → A vapourization B evaporation C condensation D cracking
223 Water has maximum density at __________________? Chemistry Medium Full question → A 0°C B 2°C C 4°C D 100°C
224 The quantity of heat required to convert one mole of liquid into its vapours at its boiling point is called molar heat of__________________? Chemistry Medium Full question → A vaporization B evaporation C crystallization D sublimation
225 Forces of attraction which may be present between all kinds of atoms and molecules are _____________________? Chemistry Medium Full question → A intramolecular B intermolecular C van der Waal D Dipole-induced dipole
226 Hydrogen bonding is involved in____________________? Chemistry Medium Full question → A Solubility B Cleansing action of detergents C Biological molecules D All
227 Liquid crystal is discovered by __________________? Chemistry Medium Full question → A William Crooks B Fredrack Reinitzer C J.J Thomson D Bravis
228 Vapour pressure of water at 100°C is___________________? Chemistry Medium Full question → A 55 mm Hg B 760 mm Hg C 355 mm Hg D 1489 mm Hg
229 In order to mention the boiling point of water at 110°C the external pressure should be ? Chemistry Medium Full question → A Between 760 torr and 1200 torr B Between 200 torr and 760 torr C 765 torr D any value of pressure
230 When substance moves from a solid to a liquid state all of the following changes occur except__________________? Chemistry Medium Full question → A Molecules become more disordered B K.E of the molecules decreases C Intermolecular forces become weaker D Molecule become further separated
231 Which of the following has strongest intermolecular forces of attraction ? Chemistry Medium Full question → A Hydrogen (H2) B Chlorine (Cl2) C lodine (I2) D Methane (CH4)
232 ________________ is study about energy of a chemical system ? Chemistry Medium Full question → A thermochemistry B thermodynamics C chemical kinetics D stoichiometry
233 Unit of heat in SI system is________________? Chemistry Medium Full question → A J B KCaL C Cal D GJ
234 Total energy of a system is_________________? Chemistry Medium Full question → A P.E + K.E B P.E + heat energy C K.E + heat energy D P.E + mechanical energy
235 CuSO4 + Zn?ZnSO4+Cu is___________________? Chemistry Medium Full question → A Spontaneous reaction B Non-spontaneous reaction C Endothermic D Exothermic
236 State function the macroscopic property of system depends upon________________? Chemistry Medium Full question → A path of reaction B initial state C final state D initial and final state
237 When enthalpy of reactants is higher than product then reaction will be_________________? Chemistry Medium Full question → A endothermic B spontaneous C non-spontaneous D exothermic
238 Enthalpy of combustion for food fuel and other compounds can be measured accurately by________________? Chemistry Medium Full question → A glass calorimeter B bomb calorimeter C thermometer D manometer
239 Enthalpy change can be_________________? Chemistry Medium Full question → A calculated by Hess law B can be measured by calorimeter C both A and B D none
240 Two fundamental ways to transfer energy are________________? Chemistry Medium Full question → A pressure and temperature B pressure and volume C heat and work D heat and volume