Physical Chemistry Questions

CH 52 CH C CH C OH OH Eto K EtOH EtOH H X The product X and Y are respectively CH CH 1 CH C CH OCH CH and CH C CH OH OCH CH Y CH CH CH 2 CH C CH OH and CH C CH OCH CH OCH CH OH Cahy CH3 CH3 3 CH C CH OH and CH C CH OCH CH OH OH CH 4 CH C CHOCH CH and CH C CH OH OH OH CH3 52 CH C CH Eto K EtOH 910 EtOH H 4 X Y en CH 1 CH C CH OCH CH TT CH C CH OH OH OCH CH CH CH3 2 CH C CH OH 7T CH C CHOCH CH OCH CH OH CH CH 3 CH C CH OH 2I CH C CH O CH CH OH OH CH CH 4 CH C CH OCH CH 7I CH C CHOH OH OH

67 What is the product of the reaction ON 1 ON 2 ON 3 0 N 4 no reaction Consider the following chlorides HON CH I HOH C CH OH IH C CH I IH C Xwe CH3 Cold H CH CH3 CH3 Aud 68 CH CH OH POCHO CH CH Cl 4 3 O N 1 0 N 2 0 N 3 0 N 4 PCI H CH 1 HOH C CHOH IH C CH I IH C Na CN NaC CH3 CH CH CN TO Cold HI CH3 CH3 CH NSR

A liquid mixture of A and B contains 1 mol of each if the pressure is reduced at what pressure does the last drop of liquid disappear PA 400 mmHg Pg 100 mmHg 1 106 6 mmHg 2 213 3 mmHg 3 160 mmHg

4 None of these Energy of electron of hydrogen atom in second Bohr orbit is 1 5 44 x 10 19 J 3 5 44 x 10 19 cal 2 5 44 x 10 19 KJ 4 5 44 x 10 19 ev

d inside a conducting s 2R and outer radius he centre of the shell center of the shell is 1 4q 4TED 3R 1 20 TED 3R ectrostatic field onstant is c is y c y 4 6 4 A uniform electric field of 100 Vm is directed at 30 with the positive x axis as shown in figure OA 2m and OB 4m The potential difference VS VA is A B 30 1 100 2 3 V 2 100 2 3 v 3 100 2 3 V 4 100 2 3 V A solid sphere of radius R is charged uniformly At 1 kab d Ekad 23 Consider a c an infinite c and it is ke Then capa 1 4 a 3 Ta Three ide one anc plates a

The rate constant k of a reaction is found to be double that of rate constant k of another reaction The relationship between corresponding activation energies of the two reactions at same temperature E E can be represented as 1 E E 3 E E 2 E E 4 E 4E

PC H O CH 3PO4 5HCI 4 CH OH CH CO O CHOCOCH CH3COOH 62 In the following free radical substitution reaction hv CH CH CH CH3 Br 1 R is formed 2 S is formed 3 both R and S are formed 4 none of the above is formed 3 CH CH CH HI A 2 C6Hr Aq KOH B 62 3 3C H5OH PCI H O CH PO4 SHCI 4 C H5OH CH CO 0 C H OCOCH CH COOH fe CH3CH CH CH3 Br 1 R32 Fafta m 2 Safaftia 3 Rasa fatta am 4 3 STE no fuf hv 34 e 63 CH CH CH HI A Aq KOH 67

Which of the following statements about ionization energy is correct lonization energy increases down the group lonization energy first increases and then decreases across a period c The ionization energy of lithium is the minimum in the second period D lonization energies of noble gases are minimum

0 For a cell A s A aq B aq B Ecell is 4 2 V at 25 C and 4 1V at 35 C The 0028 value of ASO for cell reaction assuming AS 6 in JK mol is 1 9 65 3 965 nda imited 0 05 2 96 5 4 0 965

What happens when copper is heated in air a It combines with oxygen to form cop per II oxide a blue oxide b It combines with oxygen to form copper II oxide a black oxide c It combines with oxygen to form copper 1 II oxide a blue oxide d It combines with oxygen to form copper 1 II oxide a black oxide

Consider the following statements A Electron density in XY plane in 3d is zera B Electron density in XY plane in 3d orbital is zerc C 2s orbital has only one spherical node D For 2P orbital YZ is the nodal plane The correct statements are 1 b and c 2 a b c d 3 only b

2 CH C C H CH C C H N NH CH 1 A Li lig NH B Relation between B and C is 1 Enantiomer 2 Diastereomer 3 Geometrical isomer 4 Both 2 and 3 H Pd Caco C or BaSO4 72 SH CEC H 72 QH C C H NINH2 CH L A Li liqNH 4211 Teometrical Diometers 25 1 Enantiomer X 2 Diastereomer 3 Geometrical isomer 4 2 7 3 all H Pd CaCO or BaSO C B P Boration CCB oxiduter CH CEC NOB CC CH 5 CH3 1 2 3 5 2 1 3 5 go 3 3 5 1 U2 4 2 3 4 GC

82 The graph which represents all the equilibrium concentrations for the reaction N O4 8 2NO g Then the select the correct graph for concentrations of NO against concentrations of NO 4 ON N 04 ON N O4 PON N 04 ON N O4

Which of the following is are not a favorable condition s for the formation of a ionic bond i Low ionization potential for the easy formation of cation ii High electron affinity for the easy formation of anion iii Large electronegativity difference between two elements forming an ionic bond iv High ionization potential for the easy formation of cation A i and ii B i ii and iii c ii only D iv only

1 In ideal solution of non volatile solute B in solvent A in 25 mholar ratio has vapour pressure 250 mm If a another solution in ratio 3 4 prepared then vapour pressure above this solution 1 200 mm 3 350 mm 2 250 mm 4 400 mm

1 NH 2 C 3 SO 4 CO 11 1 mol CO ocupies 0 4 lit at 27 C and 40 atm calculate the compressibility factor 1 0 65 2 0 85 3 0 15 D 1 65

1 Vapor pressure equation for liquid zinc is given by the following expression 6676 log p mmHg 1 7210gT 12 448 T The triple point temperature for zinc is 419 C and the pressure at this temperature is 0 0082 atm The melting temperature of zinc is 420 C and enthalpy of melting of zinc is 1740 cal mole degree a A piece of zinc placed inside a ceramic crucible is heated in an evacuated chamber to elevated temperatures in order to generate a zinc vapor pressure of 0 2 atm inside the chamber To what temperature zinc should be heated to get this atmosphere b What would be the vapor pressure of zinc inside the chamber when zinc was

36 Which is the most suitable reagent among the following 36 faffer uges funt atat c distinguish compound c from the others a CH C C CH b CH CH CH CH c CH CH C CH d CH CH CH 1 Bromine in carbon tetrachloride 2 Bromine in acetic acid solution 3 Alk KMnO4 4 Ammonical silver nitrate 324 fadfe a CH C C CH b CH CH CH CH3 c CH CH C CH d CH CH CH 1 atata anda gracias 2 ata ufafeen facra f 3 Alk KMnO 4 la facer Product Y of this e Br 3 Br NH Br NH

Which of the following will violates Aufbau principle as well as Pauli s exclusion principle 1 2 3 2p 2 N O 2p m o H

For the decomposition N O g N O g O g the initial pressure of N O5 is 114 mm and after 20 sec the pressure of reaction mixture becomes 133 mm The rate of reaction in terms of atm sec is 1 1 25 x 10 atm sec 3 9 5 x10 atm sec 2 2 5 x 10 atm sec 4 4 75 x10 atm sec 1

Air contains 79 N and 21 O by volume If th total pressure is 750 mm of Hg then the part pressure of O is 1 157 2 mm of Hg 2 175 5 mm of Hg 3 315 0 mm of Hg 4 None of these

ne figure that is not a direct manifestation of the quantum nature of atoms is JEE Main 2020 Increasing wavelength 1 2 3 Absorption spectrum Internal energy of Ar 300 400 500 600 Temperature K Intensity of black body radiation T T T 1 Wavelength

The spectrum of hydrogen molecule 18 Calculate de Broglie wavelength of a neutron mass m 1 6x10 27 kg moving with kinetic energy of 0 04 eV 1 146 A 3 1460 A Consider the following 19 2 14 6 4 1 46

a Explain the hybridization and bond angles found in BF3 and H O b What is the hybridization of the carbon atoms in H C C CH tion c Propose a mechanism for this reaction Why the ring contraction is f

4 A certain radiostation broadcasts at a frequency of 900 KHz The wavelength of electromegnetic radiations broadcast by radiostation is 1 900 m 3 2 70 km 2 270 m 4 330 m

4 The energy corresponding to second line of Balmer series for hydrogen atom will be 1 12 1 eV 3 2 55 eV 2 1 89 eV 4 13 6 eV

Calculate the pH and concentration of species present in a polyprotic acid solution For a 6 60 10 M solution of H S calculate both the pH and the S ion concentration H O HS K 1 0 10 7 H O S K 1 0 10 19 H S H O HS H O pH IM

163 The heat of reaction for A 0 AO is 50 kCal and AO 0 0 AO is 100 kCal The heat of reaction for A O AO is 1 50 kCal 3 100 kCal TC0182 2 50 kCal 4 150 kCal TC0184

4 c b a d 4 c b a d When isobutane is treated with Cl in sunlight major product sigui g s f 1 C1 Mar is O 1 1 alkyl chloride 2 2 alkyl chloride 3 3 alkyl chloride 4 alkene 3 1 1 alkyl chloride 2 2 alkyl chloride 4 alkene Kauran alkyl chloride 14 SH CH 4 q chlonn CH CH Ch y Chefchlo 42 Chi an cha c ch

1 Two identical vessels are connected by a narrow tube of neglisible volume The vessels are containing a total of 3 mole of an ideal gas at 4 atm and 27 C Now 1st vessel is cooled to 73 C while the 2nd is heated to 127 C Then no of moles of gas in 1st and 2nd vessels 127 C respectively A 15 1 5 B 1 2 are C 2 1 D 1 8 1 2

66 Ethanol can be converted to propane nitrile CH CH CN by the following reaction 1 CH CH CH OH KCN 2 CH CH OH HCN A PCI 3 CH3CH OH POCHO CH CH CI 4 All of these 7 What is the product of the reaction Alcoholenger on KCNX Na CN NaCl CH3CH CN HON XWea Allo

31 For the Balmer series in the spectrum of H atom 1 1 n n v RH the correct statements amodica 1 M to VI are 1 As wavelength decreases the lines in the series converge II The integer n is equal to 2 III The lines of longest wavelength corresponds to n 3 1 1 II III IV The ionization energy of hydrogen can be calculated from wave number of these lines JEE Main 2020 2 II III IV

C If the electronic configuration of nitrogen atom is 2px7 then which of the following is are violated 1 Pauli exclusion principle 2 Aufbau rule 3 Hund s rule for maximum multiplicity 4 All of these

35 1 3 OH CH3 CH3 Br OH CH3 CH3 CH3 JOH CH3 1 0s04 2 NaHSO A 2 4 product of the reaction is 35 CH3 CH3 OH OH OH H CH CH3 Which is the most suitable reagent among the follow 1 3 Br CH3 CH3 2 OH OH CH3 CH3 CH F OH CH3 1 0s0 2 NaHSO B ff OH Syndi 4 CH3 QH OH CH3 OH CH3 CH 1 A 2 B 3 C 4 A and C NH Conc Product Y of t

0 84 g of a metal carbonate reacts exa ctly with 40 ml of N 2 H2SO4 The equi valent weight of the metal carbonate is Why is the equivalence of metal carboo nate equal to equivalence of H2SO4 An d why is H2SO4 taken as solution and n ot solvent

reactions C graphite 1 2O CO AH 110 5 kJ CO 1 2O CO AH 283 2 kJ the heat of reaction of C graphite O CO is 1 393 7 kJ 3 172 7 kJ 155 From the thermochemical 2 393 7 kJ 4 172 7 kJ TC0174

Consider the following chlorides a b CH3 c CH30 CH Cl CH C1 CH Cl 1 a b c d 2 d c b a 3 d a b c 4 c b a d C cu Spirens d O N CH C1 The order of reactivity of a b c and d towards hy drolysis by S1 mechanism is 4 3 68 FRI S a H b CH3 R c CH30 Flo d 0 N CH C1 IH C TO Seeling mistake 3 a b c d fff CH C1 CH CI CH Courhood Aliphatic NSR SNL arburation carbocational Ref 4 H CH C1 1 a b c d 2 d c b a 3 d a b c 4 c b a d Berb SND 3fb tin a R 141 Fl fa

Which one of the following statement is incorrect regarding the galvanic cell in which the reaction Zn s 2Ag aq Zn aq 2Ag s takes place 1 Zn is negatively charged electrode 2 Ag is negatively charged electrode 3 The flow of current is partly due to flow of electrons and partly due to flow of ions 4 Current Now from A to Zn in external

142 The enthalpy changes at 298 K in successive breaking of O H bonds of water are H OH g OH g AH 498 kJ mol OH g H g O g AH 428 kJmol the bond enthalpy of O H bond is 1 498 kJ mol 3 70 kJ mol 2 428 kJ molt 4 463 kJ mo TC0159 ession

Pre Medical Chemistry 255 156 If H O H O AH 68 39 kCal K H O water AH 48 0 kCal KOH aq 2 H KOH water KOH aq AH 14 0 kCal the heat of formation of KOH is 1 68 39 48 14 0 2 68 39 48 0 14 0 3 68 39 48 0 14 0

The reaction A B follows second order kinetics At 30 C the half life for the decomposition of A is 7 hours when the initial concentration of A is 4 46 M At 90 C the energy of activation of the reaction is 200 kJ mol Calculate the rate constant of this reaction at 30 C 4 1 2

2 Concentration of the product 3 Volume of the reaction container 4 Temperature CK0105 For the decomposition of N O g it is given that 2N O g 4NO g O g activation energy E N O g 2NO g O g activation energy E then 1 E 2E 3 E E 2 E E 4 E E

167 The heat of solution of anhydrous CuSO and CuSO 5H O are 15 89 and 2 80 kCal mol respectively What will be the heat of hydration of anhydrous CuSO 1 18 69 kCal 3 28 96 kCal 2 18 69 Cal 4 28 96 kCal TC0189

Given the standard electrode potential K K 2 93V Ag Ag 0 80 V Hg2 Hg 0 79V Mg Mg 2 37V Cr Cr 0 74V Correct order of their reducing power is 1 Ag Hg Cr Mg K 2 K Mg Cr Hg Ag 3 K Cr Mg Ag Hg 4 Cr Mg K Hg Aq

157 Given C s O g H g O g CO g 94 2 kCal H O 68 3 kCal CH g 20 g CO g 2H O 210 8 kCal The heat of formation of methane in Kcal will be 1 45 9 2 47 8 131 20 0 4 47 3

8 Calculate the amount of each emulsifier in grams in the following prescription for oral use 8 Points Sesame oil Tween 40 Span 60 Cherry syrup 30 mL q s q s qs to 100 mL HLB of Tween 40 15 6 HLB of Span 60 4 7

TC0176 58 If H g Cl g 2HCl g AH 44 kCal 2Na s 2HCl g 2NaCl s H g AH 152 kCal Then Na s 0 5 C1 g 1 108 kCal 3 98 kCal NaCl s A H 2 196 kCal 4 54 kCal

161 Given that Zn 1 2O ZnO 84000 Cal Hg 20 HgO 21700 Cal The heat of reaction AH for Zn HgO ZnO Hg is 1 105700 Cal 3 105700 Cal 2 62300 Cal 4 62300 Cal

a Define conductivity and molar conductivity for the solution of an electrolyte b Define Kohlrausch law A for NaCl HCI and CH3COONa respectively are 126 426 91 S cm mol 1 Calculate A for CH3COONa

What is the formal charge on S in this molecule 0 S 0 0 2 O 1 0 2 Oo 0