0% 0 Stoichiometry Quiz 7 1 / 69 Which of the following gases is the most soluble in water ? NH3 H2S CH4 CO2 2 / 69 With rise in temperature, the solubility of ammonia in water at a fixed pressure___________? Decreases Increases exponentially Increases Remains unchanged 3 / 69 Which of the following is an exothermic reaction ? None of these Conversion of graphite to diamond Decomposition of water Dehydrogenation of ethane to ethylene 4 / 69 With increase in the alumina content, the refractoriness of high alumina refractories__________? Decreases May increase or decrease Increases Remain same 5 / 69 Which of the following has the least (almost negligible) effect on the solubility of a solute in a solvent ? Temperature Nature of solvent Pressure Nature of solute 6 / 69 Validity of the relationship, inputs = outputs, holds good for the system at steady state_________? With chemical reaction None of these Without chemical reaction Without chemical reaction & losses 7 / 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 ? 0.4 0.6 0.1 0.2 8 / 69 Total energy at a point comprises of ______ energy? All A., B. & C. Internal Pressure Potential & kinetic 9 / 69 With increase in the solute concentration, the specific heat of aqueous solutions _______? Increases Remains unchanged Either A. or B.; depends on the type of solution Decreases 10 / 69 Which of the following is followed by an ideal solution ? Boyle?s law Amagat?s law Trouton?s rule Raoult?s law 11 / 69 Which of the following is the Clausius-Clapeyron Equation ? PV = RT + B/V + y/V2 + ?. (P + a/V2)(V-b) = RT loge (p/p0) = (?/R) (1/T0 ? 1/T) p = [RT/(V ? b)] ? (a/TV2) 12 / 69 With rise in temperature, the heat capacity of a substance_____? Decreases Remains unchanged Either A. or B.; depends on the substance Increases 13 / 69 Which is not an acidic refractory ? High alumina refractory Silica Carbon black Fireclay 14 / 69 Which is a neutral refractory ? Graphite Magnesite chrome Silica Magnesia 15 / 69 The temperature at which the second Virial co-efficient of a real gas is zero is called the_______? Boyle temperature Critical temperature Boiling point Eutectic point 16 / 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___________? 0.11 0.13 0.07 0.09 17 / 69 Unit of mass velocity is_____? kg/hr kg/m.hr kg/m2 kg/m2.hr 18 / 69 Which equation is not an equation of state ? p = [RT/(V ? b)] ? (a/TV2) PV = RT + B/V + y/V2 + ?. loge (p/p0) = (?/R) (1/T0 ? 1/T) (P + a/V2)(V-b) = RT 19 / 69 The unit of Cp in S.I. units is_____? J/kg.?K W/m2.?K W/m.?K J/m3. ?K 20 / 69 The temperature at which a real gas obeys Boyle?s law is termed as the___________? Boyle?s temperature Inversion temperature Triple point Eutectic point 21 / 69 The vapor pressure of water at 100?C is___________? 76 cms of Hg 13.6 cms of Hg 100 N/m2 760 mm wc 22 / 69 Variation of vapor pressure with temperature can be calculated using Clausius-Clapeyron equation, which assumes that the_________? All A., B. & C. Volume in the liquid state is negligible compared with that in the vapor state Vapor follows the ideal gas law Molal latent heat of vaporisation is constant within the limited temperature range 23 / 69 Unrestrained expansion of an ideal gas does not result in its cooling due to the reason that the gas molecules ______? Do not exert attractive force on each other Do work equal to loss in kinetic energy Are above the inversion temperature Do not lose energy on collision 24 / 69 Thermal conductivity of refractory bricks______? Decreases with decreases in porosity Is independent of its porosity and is maximum for insulating bricks Increases with decrease in porosity Increases with the amount of air entrapped in pores 25 / 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__________? 0.8 0.2 0.6 0.4 26 / 69 Which of the following gravity scales is used exclusively for liquids heavier than water ? Baume scale Twaddell scale None of these API scale 27 / 69 Which property of refractories is the most important for top section of the blast furnace ? Resistance to corrosion by slag Resistance to slag penetration Resistance to abrasion Stability of volume at high temperature 28 / 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 29 / 69 Which of the following has the smallest least effect on the solubility of a solute into the solvent ? Nature of the solute Nature of the solvent Temperature Pressure 30 / 69 The value of gas constant ?R? is _______ kcal/kg.mole.?C? 1.987 None of these 3.99 2.79 31 / 69 Which of the following is not a colligative property ? Osmotic pressure Lowering of vapor pressure None of these Depression of freezing point 32 / 69 Which of the following expressions defines the Baume gravity scale for liquids heavier than water ? 145 ? (145/G) (141.5/G) ? 131.5 (400/G) ? 400 200 (G-1) 33 / 69 The total number of atoms in 8.5 gm of NH3 is ________ ? 1023? 3.01 1.204 9.03 6.02 34 / 69 With increase in the porosity, thermal spalling resistance of fireclay brick________? Increases May increase or decrease Decreases Remain same 35 / 69 Viscosity of 1 centipoise is equal to 1 Centistoke in case of_________? Water Mercury Carbon tetrachloride None of these 36 / 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) ? A2B A2B3 AB3 AB2 37 / 69 Which of the following terms of Vander Walls equation of state for a non-ideal gas accounts for intermolecular forces ? 1/RT P + (a/V2) (V ? b) RT 38 / 69 Volume occupied by one gm mole of a gas at S.T.P. is ______? 359 litres 22.4 litres 22400 litres 22.4 c.c 39 / 69 The vapor pressure of a substance, at its melting point, is ______ in the solid state as compared to that in the liquid state? Less More Same Either A. or B.; depends on the nature of the substance 40 / 69 Which form of silica has the highest specific gravity ? Quartz Cristobalite Tridymite All have the same specific gravity 41 / 69 The viscosity of water at room temperature may be around one _____? Poise Centipoise Both B. & C. Stoke 42 / 69 The vapor pressure of liquids (having similar chemical nature) at any specified temperature _______ with increasing molecular weight? Increases Increases linearly Remains unchanged Decreases 43 / 69 Which of the following gases will have the- highest kinetic energy per mole at the same pressure & temperature ? Ethane Chlorine All the gases will have the same KE Nitrogen 44 / 69 Which of the following expressions defines the Baume gravity scale for liquids lighter than water ? ?Be = (140/G) ? 130 ?Be = (400/G) ? 400 ?Be = 200(G-1) ?Be = 145 ? (145/G) 45 / 69 With increase in the temperature of pure (distilled) water, its______? pOH and pH both decreases pH and pOH both increases pOH decreases and pH increases pH decreases and pOH increases 46 / 69 Which of the following ratios defines the recycle ratio in a chemical process ? Recycle stream/gross feed stream None of these Gross feed stream/recycle feed stream Recycle stream/fresh feed stream 47 / 69 Water content in ground refractory material to be shaped into bricks by hand moulding is about ______ percent? 5 40 55 20 48 / 69 Two solutions A1 and A2 have pH value of 2 and 6 respectively. It implies that the solution_______? Both A. & C. A2 is more alkaline than solution A2 A1 is very slightly acidic A1 is highly acidic 49 / 69 The weight fraction of methanol in an aqueous solution is 0.64. The mole fraction of methanol XM satisfies_________? 0.5 < XM < 0.64 XM < 0.5 XM = 0.5 XM ? 0.64 50 / 69 With increase in temperature, the surface tension of water _______? Increases Increases linearly Decreases Remain constant 51 / 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 Remains unchanged Increases Decreases 52 / 69 Unit of power is______? Joule/Second Watt Both B. & C. Joule 53 / 69 The unit of dynamic viscosity is__________? gm/cm sec Poise Both B. & C. Stoke 54 / 69 Which of the following ideal gas laws are not applicable to mixture of gases ? Amagat?s law None of these Boyle?s law & Charle?s Law Dalton?s law 55 / 69 The value of (Cp ? Cv) for a real gas obeying Vander Wall?s equation is______? 0.5 R > R < R R 56 / 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 ? 780.5 801.5 880.5 756.2 57 / 69 Viscosity of atmospheric air may be about ______ centipoise? 1.5 150 15 0.015 58 / 69 Weight of 56 litres of ammonia at N.T.P. is ______ gm? 56 2.5 42.5 2800 59 / 69 The value of the gas-law constant ?R? is 1.987 ? kcal/kg-mole.?C Both B. & C. Btu/lb-mole.?R kcal/kg-mole.?K 60 / 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 ? 1/3 ? (298/273) 3-Feb 2-Jan 3-Jan 61 / 69 The unit of specific heat at constant pressure, Cp, in SI unit is___________? J/kg?K W/m2?C W/m?K J/m3?K 62 / 69 Vapor pressure of water at 100?C is about ________ bar? 0.1013 101.3 10.13 1.013 63 / 69 Which of the following is not a unit of kinematic viscosity ? None of these Stoke Poise cm2/second 64 / 69 Thermal diffusivity of a refractory brick is high, when its _______ is high? Density None of these Specific heat Thermal conductivity 65 / 69 Which is an acidic refractory ? Chrome magnesite Dolomite Magnesite Fireclay 66 / 69 The reverse process of fractional crystallisation is called___________? Differential distillation Stripping Absorption Leaching 67 / 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. Non-polar Both A. & B. Polar 68 / 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? Compressibility None of these Humidity Molecular weight 69 / 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 More than Either more or less; depends on the solvent 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
