0% 0 Stoichiometry Quiz 7 1 / 69 The unit of specific heat at constant pressure, Cp, in SI unit is___________? J/kg?K W/m2?C J/m3?K W/m?K 2 / 69 What fraction of the total pressure is exerted by oxygen, if equal weights of oxygen and methane are mixed in an empty vessel at 25?C ? 3-Jan 1/3 ? (298/273) 2-Jan 3-Feb 3 / 69 Which of the following has the least (almost negligible) effect on the solubility of a solute in a solvent ? Pressure Temperature Nature of solvent Nature of solute 4 / 69 Which of the following is the Clausius-Clapeyron Equation ? p = [RT/(V ? b)] ? (a/TV2) loge (p/p0) = (?/R) (1/T0 ? 1/T) PV = RT + B/V + y/V2 + ?. (P + a/V2)(V-b) = RT 5 / 69 Under conditions of equal reduced pressure and equal reduced temperature, substances are said to be in the ?corresponding states?. At equal reduced conditions i.e., at the corresponding state, the _____ of different gases are nearly the same? Humidity None of these Compressibility Molecular weight 6 / 69 Volume occupied by one gm mole of a gas at S.T.P. is ______? 22.4 litres 22.4 c.c 359 litres 22400 litres 7 / 69 The value of Trouton?s ratio (?b/Tb) for a number of substances is 21 (where, ?b = molal that of vaporisation of a substance at its normal boiling point, KCal/kg. mole and Tb = normal boiling point, ?K). The Kistyakowsky equation is used for calculation of Trouton?s ratio of ______ liquids? Neither A. nor B. Polar Non-polar Both A. & B. 8 / 69 Variation of vapor pressure with temperature can be calculated using Clausius-Clapeyron equation, which assumes that the_________? Volume in the liquid state is negligible compared with that in the vapor state Molal latent heat of vaporisation is constant within the limited temperature range All A., B. & C. Vapor follows the ideal gas law 9 / 69 Which of the following expressions defines the Baume gravity scale for liquids lighter than water ? ?Be = 145 ? (145/G) ?Be = 200(G-1) ?Be = (140/G) ? 130 ?Be = (400/G) ? 400 10 / 69 Water content in ground refractory material to be shaped into bricks by hand moulding is about ______ percent? 20 55 40 5 11 / 69 The value of gas constant ?R? is _______ kcal/kg.mole.?C? 2.79 None of these 3.99 1.987 12 / 69 The unit of Cp in S.I. units is_____? W/m2.?K J/kg.?K J/m3. ?K W/m.?K 13 / 69 Viscosity of 1 centipoise is equal to 1 Centistoke in case of_________? Mercury None of these Carbon tetrachloride Water 14 / 69 Which of the following is followed by an ideal solution ? Raoult?s law Boyle?s law Trouton?s rule Amagat?s law 15 / 69 The vapour pressure of water is given by, in Psat = A ? (5000/T), where A is a constant, Psat is the vapour pressure in atm. and T is the temperature in K. The vapor pressure of water in atm. at 50?C is approximately___________? 0.13 0.11 0.07 0.09 16 / 69 The vapor pressure of the solvent decreased by 10 mm Hg, when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent, if the decrease in vapor pressure of the solvent is required to be 20 mm Hg ? 0.1 0.2 0.6 0.4 17 / 69 The unit of dynamic viscosity is__________? Poise gm/cm sec Stoke Both B. & C. 18 / 69 Which is a neutral refractory ? Magnesite chrome Magnesia Silica Graphite 19 / 69 With rise in temperature, the heat capacity of a substance_____? Decreases Increases Remains unchanged Either A. or B.; depends on the substance 20 / 69 Vapor pressure of a solution is proportional to (where, Sv and St are mole fraction of solvent and solute respectively) ? 1/Sv Sv St 1/St 21 / 69 What is the total pressure exerted by a mixture of 0.45 kg mole of benzene, 0.44 kg mole of toluene and 0.23 kg mole of o-xylene at 100?C, if their vapor pressures at 100?C are 1340, 560 and 210 mmHg respectively ? 756.2 780.5 880.5 801.5 22 / 69 With increase in temperature, the surface tension of water _______? Remain constant Increases linearly Decreases Increases 23 / 69 Which of the following is an exothermic reaction ? Dehydrogenation of ethane to ethylene Decomposition of water None of these Conversion of graphite to diamond 24 / 69 Which of the following gases will have the- highest kinetic energy per mole at the same pressure & temperature ? All the gases will have the same KE Chlorine Nitrogen Ethane 25 / 69 Which property of refractories is the most important for top section of the blast furnace ? Resistance to abrasion Resistance to corrosion by slag Stability of volume at high temperature Resistance to slag penetration 26 / 69 Thermal conductivity of refractory bricks______? Decreases with decreases in porosity Increases with decrease in porosity Is independent of its porosity and is maximum for insulating bricks Increases with the amount of air entrapped in pores 27 / 69 Which of the following is not a colligative property ? Osmotic pressure Depression of freezing point Lowering of vapor pressure None of these 28 / 69 The vapor pressure of a substance, at its melting point, is ______ in the solid state as compared to that in the liquid state? More Same Either A. or B.; depends on the nature of the substance Less 29 / 69 What is the simplest formula of a compound containing 50% of element A (atomic weight = 10) and 50% of element B (atomic weight = 20) ? AB3 AB2 A2B3 A2B 30 / 69 Which of the following is not a unit of kinematic viscosity ? None of these Stoke Poise cm2/second 31 / 69 The weight fraction of methanol in an aqueous solution is 0.64. The mole fraction of methanol XM satisfies_________? XM ? 0.64 XM = 0.5 XM < 0.5 0.5 < XM < 0.64 32 / 69 Total energy at a point comprises of ______ energy? Potential & kinetic All A., B. & C. Internal Pressure 33 / 69 Which of the following gases is the most soluble in water ? CO2 NH3 CH4 H2S 34 / 69 Vapor pressure of water at 100?C is about ________ bar? 101.3 10.13 1.013 0.1013 35 / 69 Which is not an acidic refractory ? Carbon black Silica Fireclay High alumina refractory 36 / 69 Which of the following expressions defines the Baume gravity scale for liquids heavier than water ? (141.5/G) ? 131.5 145 ? (145/G) (400/G) ? 400 200 (G-1) 37 / 69 The viscosity of water at room temperature may be around one _____? Poise Both B. & C. Centipoise Stoke 38 / 69 Unit of power is______? Joule/Second Both B. & C. Watt Joule 39 / 69 The reverse process of fractional crystallisation is called___________? Absorption Leaching Differential distillation Stripping 40 / 69 Which is an acidic refractory ? Chrome magnesite Dolomite Magnesite Fireclay 41 / 69 With increase in the solute concentration, the specific heat of aqueous solutions _______? Either A. or B.; depends on the type of solution Remains unchanged Decreases Increases 42 / 69 Which equation is not an equation of state ? (P + a/V2)(V-b) = RT PV = RT + B/V + y/V2 + ?. p = [RT/(V ? b)] ? (a/TV2) loge (p/p0) = (?/R) (1/T0 ? 1/T) 43 / 69 The value of (Cp ? Cv) for a real gas obeying Vander Wall?s equation is______? R 0.5 R < R > R 44 / 69 The vapor pressure of water at 100?C is___________? 100 N/m2 760 mm wc 13.6 cms of Hg 76 cms of Hg 45 / 69 Which of the following terms of Vander Walls equation of state for a non-ideal gas accounts for intermolecular forces ? (V ? b) 1/RT P + (a/V2) RT 46 / 69 With rise in temperature, the solubility of ammonia in water at a fixed pressure___________? Increases exponentially Remains unchanged Decreases Increases 47 / 69 Which form of silica has the highest specific gravity ? Cristobalite All have the same specific gravity Quartz Tridymite 48 / 69 Weight of 56 litres of ammonia at N.T.P. is ______ gm? 2800 56 2.5 42.5 49 / 69 Two solutions A1 and A2 have pH value of 2 and 6 respectively. It implies that the solution_______? Both A. & C. A1 is highly acidic A2 is more alkaline than solution A2 A1 is very slightly acidic 50 / 69 Which of the following ratios defines the recycle ratio in a chemical process ? None of these Recycle stream/fresh feed stream Gross feed stream/recycle feed stream Recycle stream/gross feed stream 51 / 69 With increase in the temperature of pure (distilled) water, its______? pOH and pH both decreases pH decreases and pOH increases pH and pOH both increases pOH decreases and pH increases 52 / 69 Unit of mass velocity is_____? kg/m.hr kg/m2 kg/m2.hr kg/hr 53 / 69 With increase in the porosity, thermal spalling resistance of fireclay brick________? Decreases May increase or decrease Remain same Increases 54 / 69 The temperature at which a real gas obeys Boyle?s law is termed as the___________? Eutectic point Inversion temperature Boyle?s temperature Triple point 55 / 69 The vapor pressures of benzene and toluene are 3 and 4/3 atmospheres respectively. A liquid feed of 0.4 moles of benzene and 0.6 moles of toluene is vaporised. Assuming that the products are in equilibrium, the vapor phase mole fraction of benzene is__________? 0.6 0.8 0.4 0.2 56 / 69 The vapor pressure of liquids of similar chemical nature at any particular temperature ________ with increase in the molecular weight? Either A. or B.; depends on the liquid Decreases Increases Remains unchanged 57 / 69 With increase in the alumina content, the refractoriness of high alumina refractories__________? Increases Decreases May increase or decrease Remain same 58 / 69 The total number of atoms in 8.5 gm of NH3 is ________ ? 1023? 6.02 1.204 3.01 9.03 59 / 69 Which of the following ideal gas laws are not applicable to mixture of gases ? None of these Amagat?s law Dalton?s law Boyle?s law & Charle?s Law 60 / 69 Unrestrained expansion of an ideal gas does not result in its cooling due to the reason that the gas molecules ______? Do work equal to loss in kinetic energy Do not exert attractive force on each other Do not lose energy on collision Are above the inversion temperature 61 / 69 Which of the following gravity scales is used exclusively for liquids heavier than water ? None of these API scale Baume scale Twaddell scale 62 / 69 The vapor pressure of liquids (having similar chemical nature) at any specified temperature _______ with increasing molecular weight? Increases Remains unchanged Decreases Increases linearly 63 / 69 Validity of the relationship, inputs = outputs, holds good for the system at steady state_________? None of these Without chemical reaction & losses With chemical reaction Without chemical reaction 64 / 69 The vapour pressure of a solution (made by dissolving a solute in a solvent) is _____ that of the pure solvent? Less than Equal to Either more or less; depends on the solvent More than 65 / 69 Viscosity of atmospheric air may be about ______ centipoise? 1.5 0.015 150 15 66 / 69 Thermal diffusivity of a refractory brick is high, when its _______ is high? None of these Thermal conductivity Density Specific heat 67 / 69 The temperature at which the second Virial co-efficient of a real gas is zero is called the_______? Eutectic point Critical temperature Boiling point Boyle temperature 68 / 69 Which of the following has the smallest least effect on the solubility of a solute into the solvent ? Temperature Nature of the solvent Nature of the solute Pressure 69 / 69 The value of the gas-law constant ?R? is 1.987 ? kcal/kg-mole.?K Both B. & C. Btu/lb-mole.?R kcal/kg-mole.?C Provide Your Information Your score is The average score is 0% LinkedIn Facebook Twitter 0% Restart quiz Send feedback Share on facebook Facebook Share on twitter Twitter Share on whatsapp WhatsApp PrevStoichiometry Quiz 6 Thermodynamics for Chemical Quiz 1Next
