CH103 --------------------------------------------------------------------------------------------------- Question: The electrical conductivity of a semiconductor increases with ________. Answer: Temperature Question: When the temperature is lowered. gases tend to_____ Answer: Contract Question: The gas that obeys the gas laws exactly for all conditions of pressure and temperature is referred to as an ____ Answer: Ideal gas Question: Which law does the mathematical expression represents, PV = nRT, Answer: Ideal gas law Question: The total pressure exerted by a mixture of two different gases is equal to the sum of the individual pressures of the two different gases, Which gas law is this? Answer: Dalton's Law of Partial Pressures Answer: Dalton's Law Question: ______ is the passage of a gas through a small opening into an evacuated chamber Answer: Effusion Question: The diffusion depends greatly on the ____ of the gas molecules. Answer: Masses Question: The absolute temperature of a gas is proportional to the mean kinetic energy of the molecules present in It. TRUE or FALSE Answer: TRUE Question: One application of Graham's law is the gaseous diffusion method of separating _____ Answer: Isotopes Answer: Isotope Question: If the ______ is reduced sufficiently, the boiling point of a liquid may even fall below the melting point of a solid whereby the substance is said to be sublime Answer: Pressure Question: The ____ rule with reference to phase study is that phase with the lowest chemical potential, is the stable phase Answer: Golden Question: The number ______ of a system is the smallest number of intensive variables which are to be specified to describe the state of the system completely Answer: Degrees of freedom Answer: Variance Question: Intensive property is one whose magnitude is independent of the ___ of the system Answer: Size Question: An ____ is one whose magnitude is additive for subsystems Answer: Extensive property Question: The ______ in a system is the smallest number of substances in terms of which the composition of all the phases in the system can be described separately Answer: Number of components Question: Lowering of vapour pressure is not a colligative property. TRUE or FALSE Answer: FALSE Question: According to ____ law relative lowering of vapour pressure is equal to the mole fraction of the solute Answer: Raoult's Question: The ___ of the solution containing a non-volatile solute is higher than that of the pure solvent. Answer: Boiling point Question: The addition of a non-volatile solute to a solvent ____ the vapour pressure of the solvent Answer: Decrease Question: The temperature at which the solubility becomes complete is referred to as the _____ Answer: Consolute temperature Answer: Critical solution temperature Question: A pair of immiscible liquids boils at a temperature lower than the ______ of any of the liquids Answer: Boiling points Question: Water and carbon tetrachloride are miscible in all proportion. TRUE or FALSE Answer: FALSE Question: The _____ is a process of purifying organic liquids which have high boiling points and are immiscible with water Answer: Steam distillation Question: Non-ideal solutions do not obey Raoult's law. TRUE or FALSE Answer: FALSE Question: A _____ is a homogeneous part of a system which is susceptible to change on certain conditions Answer: Phase Question:  the ratio of molar enthalpy of a liquid to its boiling point is known as ______ Answer: Trouton's rule Question:

_______ is the name given to the theoretical frame that throws light on the baseline of the experiment. Answer: Theory Question: _______ is the process of separating a pure solid from a solution. Answer: Crystallization Question: The constant bombardment of gas molecules against the walls of the container gives rise to ________ Answer: Pressure Answer: Gas pressure Question: Convert 24 °C to Kelvin _____ Answer: 297.15 K Question: Find the volume occupied by 0.0660 kg of carbon (IV) oxide gas at a temperature of 300.2 K and a pressure of 9.41 x I0 Pa assuming ideal behaviour._______ Answer: 0.0398 Question: The mass of the solute that can be dissolved in 0.100 kg of a solvent to form a saturated solution at a given temperature is called its ____________. Answer: Solubility Question: In the band theory of metals, a crystalline metallic solid is considered as a _______________. Answer: Single giant molecule Question: _____________ is defined as the number of moles of solute present in one kilogram of solvent. Answer: Molality Question: The escape of molecules from the liquid surface to form vapour is called ___________. Answer: Evaporation Answer: Vaporization Question: A unit factor is a ratio that is equal to _____ Answer: I Question: Which of these apparatus is basically used for determining the points at a solid substance turns to a liquid substance? Answer: Melting point tube Question: vapour pressure can be measured using one of the following apparatus Answer: Barometer Question: ______is for the measurement of the strength of an acid or base Answer: pH meter Question: mixtures are separated us1ng appropriate techniques which depend on all of the following except: Answer: Percentage purity of the substance Question: One of these is not a main separation process for separating mixtures Answer: sieving Question: The process in which the solid directly evaporates without it melting is known as ___ Answer: sublimation Question: Which of these techniques is not a separation techniques for separating mixtures? Answer: electroanalytical Question: One of these substances cannot undergo sublimation Answer: CaCl2 Question: A substance which has mass and occupies space is appropriately described as____ Answer: Matter Question: The ___ is defined as the temperature above which a substance can exist only in the gaseous state. Answer: critical temperature Question: A sample of H2 was prepared in the laboratory by the reaction: Mg(s) + 2 HCl (aq) → MgCl2 (aq) + H2 (g). 456 mL of gas was collected at 22.0 oC and the total pressure in the flask was 742 torr. How many moles of H2 were collected? The vapour pressure of H2O at 22.0 oC is 19.8 torr. Answer: 0.0179 mole Question:  The relationship between the volume and the pressure of a given mass of a gas at a given temperature is known as ___ Answer: Boyle's law Question: For a certain amount of gas at a constant pressure, its volume (V) is directly proportional to its absolute temperature (T). The relationship between temperature and volume describes ________ Answer: Charles law Question: _____ states that the rates at which gases effuse are inversely proportional to the square root of their densities or molar masses under similar conditions of temperature and pressure Answer: Graham’s law Question: One of these statements is incorrect about the postulate of kinetic theory of gas Answer: At relatively low pressure. there are strong intermolecular forces between the molecules Question: Which of these is a vector quantity? Answer: Velocity Question: One of these is not an intensive variables Answer: Volume Question: One of these is not correct about Colligative properties Answer: Colligative properties are dependent of the nature of the solute Question: Determination of Boiling Point Elevation may be done using one of the methods listed below: Answer: Landsberger Method Question: Determination of vapour pressure lowering can be achieved by one of the methods Answer: Dynamic Method Question: The temperature at which a pair of partially miscible liquid becomes completely miscible is called _____ Answer: critical solution temperature Question: The distribution or partition coefficient, K, of the solute between the two solvents, depends on all the following except; Answer: Pressure Question: One of the following is incorrect about purification process of an impure compound by steam distillation. Answer: Must be miscible in water Question: An ______ solution is one which can be formed from two constituents with no evolution or absorption of heat and whose volume is the sum of the volumes of each of the constituents Answer: ideal binary Question: _______ states that the partial vapour pressure of any volatile component in a solution is equal to the product of the vapour pressure of the pure constituent and its mole fraction in the solution Answer: Raoult’s law Question: Which of these is not a characteristic properties of liquids? Answer: Closely parked and very orderly crystal structure Question: All are factors affecting solubility of gases except Answer: concentration Question: One of the following pair cannot constitute suitable pair for n-type conductor? Answer: Antimony: Arsenic Question: A gas sample contains 4.0 g of CH4 and 2.0 g of He; the volume of the sample at STP is _________dm3. (C = 12, H = 1, He = 4, G.M.V = 22.4 dm3 Answer: 5.6 Question: One of the following is not associated with the conductivity of semi conductors due to doping Answer: o-type Question: Calculate the volume occupied by 0.0660 kg of carbon (IV) oxide gas at a temperature of 300.2 K and a pressure of 9.41 x I0 Pa assuming ideal behaviour Answer: 0.0398m3 Question: If 3.00 litre sample of gas at 1.00 atm is compressed to 0.600 litre at constant temperature. Calculate the final pressure of the gas Answer: 5.0 atm Question: The pressure exerted by 0.5 cm3 of gas is 1 Pa at 273 K. If the temperature of the gas changes to 546 K and its pressure to 3 Pa, what will be the new volume of the gas Answer: 0.3 cm3 Question: One of the following is not a class of crystal solids Answer: Hydrogen bonded