Physical Chemistry Questions
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Physical Chemistry
EquilibriumFind the pH of the equivalence point and the volume mL of 0 0639 M KOH needed to reach the equivalence point in the titration of 23 4 mL of 0 0390 M HNO2 Volume mL KOH pH
Physical Chemistry
General42 At 27 C latent heat of fusion of a compound is 2930 J mol Entropy change is 1 9 77 J mol K 3 9 07 J mol K 2 10 77 J mol K 4 0 977 J mol K
Physical Chemistry
Solid statePotassium crystallizes in BCC with unit cell edge length of 500 pm Identify correct statement s about this solid Given N 6 10 Shortest distance between two potassium atoms is 4 33 The number of next nearest neighbours of each potassium atoms are 8 Shortest distance between two potassium atoms is 3 54 The density of this solid is 10 4 gm cm K 39
Physical Chemistry
General1 A mixture of 2 3 g formic acid and 4 5 g oxalic acid is treated with conc H SO4 The evolved gaseous mixture is passed through KOH pellets Weight in g of the remaining product at STP will be a 1 4 c 2 8 b 3 0 d 4 4 2018 6
Physical Chemistry
Equilibriumb 10 Which pair will show common ion effect a BaCl Ba NO3 2 c NH OH NH4Cl c 10 MPPMT b NaCl HCI d AgCN KCN If s and Kp are respectively solubility and solubility product
Physical Chemistry
Energeticsof a hypothetical salt MX is 150 kJmol and for MX2 it is 600 kJmol The enthalpy of disproportionation is 100 x kJmol The value of x is 1 3
Physical Chemistry
GeneralThermodynamics 23 The heat of neutralization of LiOH and HCI at 25 C in 34 868 kJ mol The heat of ionisation of LiOH will be 1 44 674 kJ 2 22 232 kJ 3 32 684 kJ
Physical Chemistry
General1 pH of 10 8 M NaOH is a 8 0 b 6 0 c 6 98 d 2 Milliequivalent of Ba OH 2 present in 100 mL solution to have pH 13 is a 10 2 d 0 01 c 0 1 temperature under high pressure 10 10 b 10 At a to h
Physical Chemistry
Equilibrium2 Equivalent resonating structures result in higher resonance energy 3 Resonating structures represent hypothetical molecules having no real existence 4 Resonating structures are less stable than the resonance hybrid In some solutions the concentration of H O remains constant even when small amounts of strong acid or strong base are added to them These solutions are known as 1 Ideal solutions 2 Colloidal solutions 3 True solutions 4 Buffer solutions
Physical Chemistry
EnergeticsThe heats of combustion of yellow P and red P are 9 91kJ and 8 78kJ respectively The heat of transition of yellow to red phosphorus is 1 18 69 kJ 2 1 13 kJ 3 18 69 kJ 4 1 13 kJ
Physical Chemistry
Chemical Bonding1 dox NEET VOL 11 In the reaction K O KO 1 O acts as an oxidising agent 2 Both K and O are oxidised 2 3 O is oxidised with K is reduced 4 K acts as an oxidising agent 12 Cr O X Cr H O oxidised product of X X in the above reaction cannot be 2 1 C O 2 Fe 3 SO 4 S
Physical Chemistry
GeneralThe heat of combustion of a reaction does not depend on a Physical state of the substance b Temperature at which combustion is carried out c Amount of oxygen present d Whether the combustion is carried out
Physical Chemistry
Surface chemistryQ 1 Solve the following multiple choice questions 1 Varnish is used to give A Transparent finish B Red colour finish C Opaque finish D Fire resistant finish 2 Thinners are added to paint to A Improving drying quality B Reduce the cost C Reduce the consistency D Provide water proofness Record 3 The paint is a mechanical dispersion mixture of one or more A Resin B Polymer C Pigment D Monomer O istr screenshot in a vehic
Physical Chemistry
SolutionsHow many times more soluble is AgCl when added to a solution of NaCN A colorless complex ion Ag CN 2 results from this addition Ksp for AgCl is 1 8 x 10 10 and Kf for Ag CN 2 is 1 0 x 1021 A 8 1 x 10 7 B 1 0 x 1021 C 1 8 x 10 10 D 1 8 x 1011 O A B A
Physical Chemistry
ElectrochemistryThe EMF of a cell corresponding to the reaction Zn s 2H aq Zn 0 1M H g latm is 0 28 volt at 25 C The pH of the solution at the hydrogen electrode AAJ KA TOPPER E 0 76 volt E 0 1 2 30 2 7 8 3 9 2 Arrange the following in correct order of Lewis acidity BF BCL BBr 4 8 30
Physical Chemistry
Solid stateA metal A exists in the bcc structure having uncovered length between the atoms along the edge in an unit cell equal to 1 2 If molar mass of the metal is 307 2 gm mole then calculate density of the crystal in gm ml Use NA 6 x 1023 and 3 1 7
Physical Chemistry
Equilibriuma Identify the correct statement regarding entropy 1 At absolute zero of temperature the entropy of all crystalline substances is taken to be zero 2 At absolute zero of temperature the entropy of a perfectly crystalline substance is ve 3 At absolute zero of temperature entropy of a perfectly crystalline substance is taken to be zero 4 At 0 C the entropy of a perfectly crystalline substance is taken to be zero
Physical Chemistry
SolutionsA solution of acetone in ethanol 1 Obeys Raoult s law 2 Shows a negative deviation from Raoult s law 3 Shows a positive deviation from Raoult s law 4 Behaves like a near ideal solution HO OH incomplete
Physical Chemistry
Chemical kineticsUse the data provided to determine the rate law including the value of k of the following reaction 2 NO g O2 g 2 NO2 g Rate 1 7x103 M s NO 0 1 Rate 3 1 105 M s NO 0 1 Rate 57 M2s NO 0 Rate 3 8 M 1 2 1 NO 0 2 Rate 9 4 103 M2s NO 0 1 Rate 57 M s NO 0 NO M 0 030 0 030 0 060 02 M 0 0055 0 0110 0 0055 Initial Rate M 15 1 0 00855 0 0171 0 0342
Physical Chemistry
Gaseous and liquid states45 When 1 mol of gas is heated at constant volume temperature is raised from 298 to 308 K Hea supplied to the gas is 500 J Then which statement is correct 1 q AU 500 J W 0 2 qAU 500 J w 0 3 q w 500 J AU 0 4 AU 0 q w 500 J
Physical Chemistry
General6 The equation for the formation of lithium bromide is Li Br LiBr If 5 0 grams of each reactant are used Which substance is the limiting reagent F Lithium G Bromine H Lithium bromide 1 There is no limiting reagent
Physical Chemistry
General3 If sulfur has two isotopes one with a mass of 32 and the other with a mass of 35 and the average mass is 32 1 if you pulled out a single sulfur atom would it have a mass of 32 1 Why or why not
Physical Chemistry
EquilibriumAn equilibrium mixture at 300 K contains N O and NO at 0 28 and 1 1 atmosphere respectively If the volume of container is doubled calculate the new equilibrium pressure of two gases Roorkee 1991 P 0 045 P 0 095 atm Pro 064 atm
Physical Chemistry
Gaseous and liquid states2 3 grams of a mixture of NO2 and N O4 have a pressure of 0 82 atm at temperature T K and volume V litres calculate PNO2 Assume V T 1 300 that all the NO2 was converted into N O4 If A 0 52 atm B 0 38 atm C 0 19 atm D 0 41 atm
Physical Chemistry
General4 Varnish is a homogeneous colloidal dispersion solution of in oil or thinne or in both apreenshot A Pigment B Resin C Salt D Gypsum 5 The material which are used to prevent the flow of heat are known as A Insulators B Conductors C Semiconductor D Paints cty
Physical Chemistry
Chemical kineticsThe following data is obtained during the first order thermal decomposition of 2 A g B g C B g at constant volume and temperature S No Time At the end of 10 minutes After completion 1 The rate constant in min is a 0 0693 c 0 00693 1 2 b 6 93 d 69 3 Total pressure in Pascal 300 200 KCET 2010
Physical Chemistry
Chemical BondingThe IUPAC name of the compound ur is 1 3 Keto 2 methylhex 4 enal 3 5 Methyl 4 oxohex 2 en 5 al Statement 1 For adsorption AG AH AS all have negative values 2 5 Formylhex 2 en 3 one 4 3 Keto 2 methylhex 5 enal
Physical Chemistry
Gaseous and liquid states0 Which postulate of the kinetic molecular theory BEST explains why gases can be compressed F Gases are in constant random motion G Gas particles move in a straight line until they collide with other matter H There is empty space between gas particles 3 There is no force of attraction between gas particles
Physical Chemistry
EquilibriumWhich of the following are correct Ksp of Fe OH 3 in aqueous solution is 3 8 x 10 38 at 298K The concentration of Fe will increase when H ion concentration decreases In a mixture of NH4Cl and NH4OH in water a further amount of NH4Cl is added The pH of the mixture will decreases An aqueous solution of each of the following salts NH4l Cr NO3 3 9H2O KCN will be basic basic acidic respectively From separate solutions of four sodium salts NaW Nax NaY and NaZ had pH 7 0 9 0 10 0 and 11 0 respectively when each solution was 0 1M the strongest acid is HW
Physical Chemistry
EquilibriumThe equilibrium constant for a reaction A B C D is 1x10 at 298K and is 2 at 273 K The chemical process resulting in the formation of C and D is 2 Endothermic 3 Unpredictable 1 Exothermic 4 There is no relationship between AH and K The most suitable method of separation of 1 1 mixture of ortho and para nitrophenol is 2 Crystallication 1 Sublimation 2 Chromatography 4 Steam distillation
Physical Chemistry
Atomic Structure3 A mixture of methane and ethene in a molar ratio ofx y has an average molecular mass of 20u The mean molar mass when they are mixed in the molar ratio y x will be 2 25 u 3 24 u 1 20 u 4 15 u
Physical Chemistry
Chemical kineticsFor the reaction 3A 5B 2C 4D which reaction rate relationship is true a 4 B SA D 4 At O 3 Ob 4 B 4 A 5 3 Oc 4 A 4 B At O c At D A D 4 A A 3 At d 4 D A C 2 A B
Physical Chemistry
GeneralAcetic anhydride is prepared in the laboratory by heating sodium acetate with 1 Ethyl chloride 2 Acetyl chloride 3 Conc H SO 4 Zinc dust An unknown alcohol is treated with the Lucas reagent to determine whether the alcohol is primary secondary or tertiary Which alcohol reacts fastest and by what mechanism 1 Secondary alcohol by S 2 2 Tertiary alcohol by S 2 4 Tertiary alcohol by S 1 3 Secondary alcohol by S 1
Physical Chemistry
GeneralBoard Competitive Exams 44 Change in enthalpy for reaction 2H O 2H O 1 O g if heat of formation of H O and H O l are 188 and 286 kJ mol respectively is 1 196 kJ mol 2 196 kJ mol 3 948 kJ mol 049
Physical Chemistry
GeneralIn order to oxidise a mixture of one mole of each of FeC O4 Fe C O4 3 FeSO4 and Fe SO4 3 in acidic medium the number of moles of KMnO4 required is JEE Main 2019 8 April Shift 1 c 3 d 1 5 a 2 b 1
Physical Chemistry
Chemical kineticsDependence of rate constant of a reaction is given by Arrhenius equation k A e RT but originally it s derived from it s differential equation Reactions A B C D follows following rate law rate k A 1 2 B 1 2 Starting with initial conc of one mole of A and B each what is the time taken for amount of A of become 0 25 mole Given k 2 31 10 3 sec 1 300 sec 600 sec O900 sec
Physical Chemistry
SolutionsThe system N O 2 NO maintained in a closed vessel at 60 C a pressure of 5 atm has an average i e observed molecular weight of 69 calculate K At what pressure at the same temperature would the observed molecular weight be 230 3
Physical Chemistry
EquilibriumConsider the following reaction where K 2 90 10 at 1150 K 280 g 250 g O g A reaction mixture was found to contain 3 61 10 moles of SO g 1 83 102 moles of SO g and 4 06x102 moles of O g in a 1 00 liter contain Is the reaction at equilibrium If not what direction must it run in order to reach equilibrium The reaction quotient Qe equals The reaction A must run in the forward direction to reach equilibrium B must run in the reverse direction to reach equilibrium Gis st aqulibein
Physical Chemistry
Equilibriumprimary secondary or tertiary Which alcohol reacts fastest and by what mechanism 1 Secondary alcohol by S 2 2 Tertiary alcohol by S 2 3 Secondary alcohol by S 1 4 Tertiary alcohol by S 1 30 mL of 0 2N BaCl is mixed with 40 mL of 0 3 N AL SO How many g of BaSO are forme 1 0 10 g 2 0 60 g 3 0 90 g 4 0 70 g 1 mole each of AgNO CuSO and AICI is electrolysed Then ratio of number of Farad
Physical Chemistry
GeneralTo assess the stoichiometry of a reaction one must use the Select the correct answer below Ounbalanced chemical equation O balanced chemical equation O masses of the substances O volumes of the substances
Physical Chemistry
Gaseous and liquid statesA compressed cylinder of gas contains 1 50 10 g of N gas at a pressure of 2 0 x 107 Pa and a temperature of 17 1 C What volume of gas has been released into the atmosphere if the final pressure in the cylinder is 1 80 x 105 Pa Assume ideal behaviour and that the gas temp is unchanged 1 1260 L 2 126 L 3 12600 L 4 45 L
Physical Chemistry
SolutionsWhen 5 litres of a gas mixture of methane a propane is perfectly combusted at 0 C ar 1 atmosphere 16 litre of oxygen at the san temperature and pressure is consumed TI amount of heat released from this combustion in AH comb CH 890 kJ mot AH comb C h 2220 kJ mol is 1 32 3 317 2 38 4 477
Physical Chemistry
Chemical BondingChoose the incorrect option regarding following complex is K Pt Cl cl x O z x Bond length Odsp hybridisation O O S of Pt 2 O C C bond length in this complex is less than individual CH CH CH CH M
Physical Chemistry
Chemical kineticsThe decomposition of H O can be followed by titration with KMnO and is found to be a first order reaction The rate constant is 4 5 x 10 2 In an experiment the initial titre value was 25 ml The titre value will be 5 ml after a lapse of
Physical Chemistry
Equilibrium1 In the reaction S 3 2 O SO 2x kcal and SO y kcal the heat of SO 1 2 0 formation of SO is 1 2x y 2 x y 3 x y 4 y 2x 2 At 27 C latent heat of fusion of a compound is
Physical Chemistry
GeneralCalculate the ratio of solubility of AgCl in 0 1M AgNO and in pure water Given K of AgCl 1 8 x 10 0 1 1 34 x 10 5 M 3 2 x 10 8 M 2 1 34 x 10 4 M 4 3 x 10 6 M
Physical Chemistry
Gaseous and liquid statesF then calculate the value of Z for the vapours One litre gas at 400 K and 300 atm pressure is compressed to a pressure of 600 atm and 200 K The compressibility factor is changed from 1 2 to 1 6 respectively Calculate the final volume of the gas
Physical Chemistry
Chemical kinetics1 25 2 50 3 75 4 100 1 In the synthesis of ammonia by Haber s process if 60 moles of ammonia is obtained in one hour then the rate of disappearance of nitrogen is 1 30 mo min 2 6 mol min 2 3 0 5 mol min 4 60 mol min The solubility product of Ag Cro is 32x10 What is the concentration of Cro ions in that solution
Physical Chemistry
Chemical kinetics1 The rate law for the reaction below is given by the expression K A B A B Product If the concentration of B is increased from 0 1 to 0 3 mole keeping the value of A at 0 1 m the rate constant will be 1 3K 2 9K 3 K 3 4 K