Physical Chemistry Questions

750 waves of an electromagnetic energy radiation passes in one minute from a point then what will be the wavelength of radiation Question Type Single Correct Type 1 4 105 m 2 2 4 107 m 3 4 16 x 10 8 m

Calculate AG for the following cell reaction Zn s Ag O s H O I Zn aq 2Ag s 2OH aq 0 80 V and EZn 2 Zn 0 76 V F 96500 EAgt Ag Given Kp of AgOH 2 10 8 Option A B C D 305 kJ mol 212 kJ mol 305 kJ mol 301 kJ mol

The enolic form of acetone contains Question Type Single Correct Type 1 9 o bonds 1 bond and 2 lone pairs 2 8 o bond 2 bond and 2 lone pairs 3 10 o bond 1 bond and 1 lone pair

The ratio of acid strength of HOCN and HCN is about Given K of HOCN 1 2x10 and K of HCN 4 2x10 10 1 535 1 2 1 535 3 2 86 10 1 4 2 86 10 1

Based upon the derivation shown for the freely jointed chain model derive an equation for the square of the average end to end distance for a new polymer architecture In this polymer architecture the chain is composed of two different repeat unit types A and B Here the number of repeat units of A are n and the number of repeat units of B are ng Moreover the lengths of the respective units are 1 and 1 Finally the bond angle between A links is 0A and the average bond angle between B links is 0 The angle between A and B links and B and A links is the same and this can be represented by OAB If this is the case the expression for the square of the average end to end distance can be represented by which of the following A r n l ngl 3 B r n nl 2n nll C r nal ngl 2nAnglalB COS OAB 1 cos 1 cos D r n 1 COSA nal 1 COSA 1 cos 1 cos

A calorimeter contains 130 g water The calorimeter and the water inside are both at 26 C A piece of metal weighing 35 g was heated to 90 C and then put into the water inside the calorimeter The equilibrium temperature was determined to be 35 C Assuming no heat is lost to the environment calculate the specific heat of the metal Calorimeter constant 120 1 Specific heat of water 4 184 JC OA 3 85 JC 1 08 254 J C OC 2 67 J C Q0 2 185 C 8 OE 3 10 J C g

29 5 mole of a mixture of FeSO4 NH4 2SO4 6H 0 and Fe2 SO4 3 required 400 ml 0 5M KMnO for complete oxidation in acidic medium Then of moles of Fe SO4 3 in the mixture is 4 1 20 1289 2 40 3 60 4 80

The enthalpy of formation of NH3 g as per the following reaction is 46 11 kJ mol at 298 K N g 3H g 2 NH3 g Calculate the value of enthalpy of formation of NH3 g at 100 C The Co JK mol values are given as N g 29 12 H g 28 82 NH3 g 35 06 Assume the given heat capacity values to be temperature independent in the range

The reaction of toluene with CI in presence of FeC1 gives X and reaction in presence of light gives Y Thus X and Y are 1 X Benzyl chloride Y m chlorotoluene 2 X Benzyl chloride Y o chlorotoluene 3 X m chlorotoluene Y p chlorotoluene 4 X o chlorotoluene and p chlorotoluene Y trichloromethyl benzene

Which of the following complete ions is expected of absorb visible light At no of Zn 30 Sc 21 Ti 22 Cr 24 Question Type Single Correct Type 1 Sc H O 3 NH3 3 2 Ti en 2 NH3 2 4 3 Cr NH3 6 A Zn NH 2

For a reaction A B E 10 kJ mol 1 AH 5 KJ mol 1 Thus potential energy profile for this reaction is PE PE PE PE B A Reaction progress B A Reaction progress M Reaction progress A A B Reaction progress

Based on below graph plotted between boiling point and mole fraction in liquid phase for the liquid binary mixture Comment on the liquid mixt Ideal solution Showing negative deviation from Raoult s law Showing positive deviation from Raoult s law Mixture of two immiscible volatile liquids B P X 1 X 1

Which of the following products are formed reacts with when potassium bromide potassium permagnate in alkaline medium Question Type Single Correct Type 1 BrO3 MnO2 2 BrO4 Mn 2

For a solution if p 600 mm Hg p 840 mm Hg under atmospheric conditions and vapour pressure of solution is 1 atm then find X and XB i Composition of solution ii Composition of vapour in equilibrium with solution

a ithe he uncertainty principle is AE x At 2 t h 4 x 3 P subset NEET 2017 C b Half filled and fully filled orbitals have greater stability due to greater exchange energy greater symmetry and more balanced arrangement c The energy of 2s orbital is less than the energy of 2p orbital in case of hydrogen lik atoms h d de Broglie s wavelength is given by velocity of the particle mv where m mass of the particle v group

What is the concentration of Ba 2 when BaF2 Ksp 1 0 x 10 6 begins to precipitate from a solution that is 0 30 M F Question Type Single Correct Type 19 0 10 7 2 3 3 x10 5 3 1 1 x 10 5

Select the correct statements if 9 65 ampere current is passed for 1 hour through the cell Ag Ag Cu Cu IM IM A Ag will oxidise to Ag and new Ag 1 36 M B Agt will reduce to Ag and new Ag 0 64 M C Cu will reduce to Cu and new Cu 0 82 M D Cu will reduce to Cu and new Cu 1 0 82 M

Which one of the following statements is incorrect about rock salt type 1 It has fcc arrangement of Na 2 Na and Ctions have a co ordination number of 6 6 3 A unit cell of NaCl consists of four NaCl units 4 All halides of alkali metals have rock salt type structure

Assuming an element to be FCC of its constituent atoms and each atom is sp3 hybridized then which of the following statement is true A All voids are empty B 100 octahedral voids are filled C 50 octahedral and 25 tetrahedral voids are filled D 50 tetrahedral voids are filled

equilibrium NH HS s NH3 g H S g A sample of solid NH HS is placed in a closed vessel and allowed to equilibrate Calculate the equilibrium partial pressure atm of NH3 assuming that some solid NH HS remains b j 2 5 0 080 0 052 0 0064

An aromatic monoacidic base has 77 42 carbon and twice as much nitrogen by weight as hydrogen 1gm of chloroplatinate of this base on ignition gave 0 327gm of Pt Find the molecular weight W of the base in gm mol From the above two data find molecular formula CxHyNz of the given Base What is the value of x

In which one of the following the number of protons is greater than neutrons but number of protons is less than the number of electrons Kerala PMT 2008 b SO 2 c H O d s o 0 OH 3

73 Two solutions A and B each of 100 L was made by dissolving 4 g of NaOH and 9 8 g of H SO in wat respectively The pH of the resultant solution obtained from mixing 40 L of solution A and 10 L of solution B is 1 5 3 2 10 6 3 9 4 4 7 5 74 Which of the following complexe is used in cencer treatment

66 Consider the following reactions at 1100 C 1 2C 0 2CO AG 460 kJ mol II 22n O 2ZnO AG 360 kJ mol D Based on these select correct alternative a zinc can be oxidised by CO AIEEE 2002 b zinc oxide can be reduced by carbon c Both a and b d None of the above

In a crystalline solid anion P are arranged in cubic close packing and cation Q are arranged in alternate tetrahedral voids If atoms along one of the body diagonal are removed The formula for the solid is PQ P Q PQ3

The vapour pressure of two pure liquids A and B that forms an ideal solution are 300 and 800 torr respectively at temperature T A mixture of the vapours of A and B for which the mole fraction of A is 0 25 is slowly compressed at temperature T The vapour pressure of this condensate on 100 condensation of vapour is measured to be P What is the value of 684 P

his problem requires values in your textbook s specific appendices which you can access through the OWLv2 MindTap Reader You should not use the OWLv2 References Tables to answer this question as the values w t match a AgSCN Ksp AgSCN 1 1 x 10 2 K sp bpbl Ksp PbI2 7 9 x 10 9 ap 0 45 a 0 3 K sp C La 103 3 Ksp La 103 3 1 0 10 1 0 9 10 0 35 K sp Ag 0 25 ascN 0 35 d MgN H PO4

1 54 9 g 2 5 4 g 3 10 8 g 4 108 0 g 7 The increasing order of basicity for the following intermediates is from weak to strong CH H C e T CH3 i H C CH CH HC E 1 v iii ii iv i 3 v i iv ii iii CH iii iv 2 iii iv ii i v 4 iii i ii iv v

13 The work done during the expansion of a gas from a volume of 4 dm to 6 dm against a constant external pressure of 3 atm is 2004 a 608 J b 304 J c 304 J d 6 J

9 4 The correct order of equivalent conductances at infinite dilution in water at room temperature for H K CH3COO and HO ions is a HO H K CH3COO b H HO K CH3COO c H K HO CH3COO H rr V U WB FF

43 In which one of the following the number of protons is greater than neutrons but number of protons is less than the number of electrons Kerala PMT 2008 205 0 b SO 2 c H O d s Se OH mort p n P

Ex 12 One gram of an alloy of Al and Mg when treated with excess of dilute HCl forms MgCl AlCl3 and hydrogen The evolved hydrogen collected over Hg at 0 C has a volume of 1 20 litres at 0 92 atm pressure Calculate the composition of the alloy Al 27 Mg 24

a moles of K2Cr2O7 are needed in acidic medium for the oxidation of 9 moles of ethanol to acetic acid An unknown metal chloride undergoes reduction reaction with Mg producing metal and MgCl2 Experiments show that 52 4 g of metal chloride reacts with 9 6 g of Mg according to above reaction The equivalent weight of metal in the given metal chloride is b b Report your answer as

9 In a saturated solution of the sparingly soluble strong electrolyte AglO molecular mass 283 the equilibrium which sets in is Aglo s Ag aq 10 aq If the solubility product constant K of Aglo at a given temperature is 1 0x10 what is the mass of Aglo contained in 100 ml of its saturated solution 2 28 3 10 g 3 1 0x107 g 0 1 1 0 20 g State the monomer of Teflon 4 2 83 10 g

73 If 10 4dm 3 of water is introduced into a 1 0 dm flask at 300 K how many moles of water are in the vapour phase when equilibrium is established Given Vapour pressure of H O at 300 K is 3170 Pa R 8 314JK mol a 1 27x10 3 mol c 1 53x10 mol b 5 56 10 3 mol d 4 46x10 2 mol

2 marks A non ideal binary solution contains components A and B Explain in terms of molecular interactions when does this solution show this solution show i a positive deviation and ii a negative deviation from Raoult s law

1 FeCl KI 2 FeCl SnCl 3 FeCl SnCl 4 HgCl SnCl 64 A fixed mass m of a gas is subjected to transformation of states from K to L to M to N and back to K as shown in the figure Pressure Volume The succeeding operations that enable this transformation of states are 1 Heating cooling heating cooling 3 Heating cooling cooling heating ww 2 Cooling heating cooling heating 4 Cooling heating heating cooling

436 0 kJ mol and 941 8 kJ mol respectively and nd dissociation enthalphies of H g and N g are enthalpy is of formation 46 kJ mol What is enthalpy of atomization of NH g 1 390 3 kJ mol 3 590 kJ mol 4 30 K cal mol 2 1170 9 kJ mol 4 720 kJ mol

Total vapour pressure of mixture of 1 mole of A P A 150 torr and 2 mol B P B 240 torr is 220 mm Hg In this case Question Type Single Correct Type 1 2 3 4 There is positive deviation from Raoult s law There is negative deviation from Raoult s law There is no deviation from Raoult s law None of these

given 0 10 M solutions of the following acids which contains the highest concentration of H3O 1 HCO2H Ka 1 8 10 4 2 CH3CO2H Ka 1 8 10 5 3 HOCI Ka 4 0 10 8 4 HF Ka 6 3 10 4 5 HCN Ka 6 2 10 10

For a semicrystalline polymer if the change in the enthalpy of fusion is 8 7 kJ mol and the change in the entropy of fusion is 25 1 J K mol The melting temperature of an infinite crystal of this polymer in C is O A 121 B 74 O C 16 D 56

For a chemical reaction 2X Y Z the rate of appearance of Z is 0 05 mol L 1 per min The rate of disappearance of X will be Question Type Single Correct Type 1 0 05 mol L 1 per hour 2 0 05 mol L 1 per min 3 0 1 mol L min 1

A solution has a 1 4 mole ratio of pentane to hexane The vapour pressure of the pure hydrocarbons at 20 C are 440 mmHg for pentane and 120 mmHg for hexane The mole fraction of pentane in the vapour phase would be 0 549 O 0 200 O 0 786

1 At 300K the standard enthalpies of formation of CH COOH CO2 g and H O are 408 393 and 286 kJ mol respectively Calculate the heat of combustion of benzoic acid at contant volume 1 3201 kJ 2 3199 75 kJ 3 3201 kJ 4 3199 75 kJ

Q 2 The solubility of magnesium hydroxide can be described using the following equation Mg OH 2 s Mg2 aq 2OH aq What will happen to the equilibrium if H ions are added to the solution Max score 2 Neg score 0 5 equilibrium will move towards the reactants equilibrium will move towards the products No change will occur as magnesium hydroxide is solid No change will occur since protons are not part of the reaction

A B D small heat Two moles of an ideal mono atomic gas undergoes a thermodynamic reversible process during which in each small step dQ absorbed by gas dW small work done by gas dU small internal energy change of gas are related to each other as dQ dW dU 2 Then heat capacity of the gas during the process is R is universal gas constant 5R 2 3R 3R 2 None of these

58 Igofan impure sample of calcium carbonate containing no thermally decomposable impurities on complete thermal decomposition gave 0 33 g of carbon dioxide gas The percentage of impurity in this sample is Atomic masses of C O and Ca are respectively 12 16 anc 40 g mol a 25 c 30 b 201 d 33 J K CET

Lt x y 3 x y HEAT OF FORMATION 107 Since the enthalpy of the elements in their standard states is taken to be zero The heat of 108 Reaction H s I g formation AH of compounds 1 Is always negative 2 Is always positive 3 Is zero 4 May be positive or negative 2 x y 4 More data required 242 2HI AH 12 40 kCal According to this heat of formation of HI will be 1 12 40 kCal 3 6 20 kCal abe of akso 1 3201 kJ 109 At 300K the standard enthalpies of formation of CH COOH CO2 and H Oare 408 393 and 286 kJ mol respectively Calculate the heat of combustion of benzoic acid at contant volume 2 3199 75 kJ L 3201 kJ 4 3199 75 kJ 2 12 40 kCal 4 6 20 kCal Brow 114 C C fo 1 115 TI C 2 he 1 3 116 T EES m m 1 2 117

3 CH CH CN 81 Identify the correct labels of A B and C in the following graph from the option given below Root mean square speed V most probable speed V average speed V no of R molecules speed 1 A VB VC V 3 A VB VC V 2 A VB VC V 4 A VB VC V

Which of the following combination of statements is true regarding the interpretation of the atomic orbitals Jan 9 2019 II a An electron in an orbital of high angular momentum stays away from the nucleus than an electron in the orbital of lower angular momentum b For a given value of the principal quantum number the size of the orbit is inversely proportional to the azimuthal quantum number c According to wave mechanics the ground state an gular momentum is equal to h 2 d The plot of y vs r for various azimuthal quantum numbers shows peak shifting towards higher r value a a d b a b