Physical Chemistry Questions

35 What is the end product in the following sequence of reactions COOH PCI 2NH Q Br KOH 1 Aniline 2 Phenol 3 Benzene 4 Benzenediazonium chloride R

Which of the following is incorrect for slaked lime Question Type Single Correct Type 1 2 It is a white amorphous powder It is sparingly soluble in water 3 It is amphoteric I gives ching conation wit

4 9 3 x 10 10 177 What is the concentration of CH COOH aq in a solution 177 0 01 NHCH COO citer la face perpared by dissolving 0 01 mole of NH CH3COO in 11 H O Ka CH COOH 1 8 x 10 5 Kb H H 1 8 x 10 5 1 5 55 10 5 4 5 55 X 10 COOH aq Ka CH COOH 1 8 10 5 K 1 5 55 10 5 2 0 10 3 6 4 x 104 4 555 10 NH40H 1 8 10 5

3 It loses water when exposed to air 4 It has a high melting point An element P has atomic number 56 What will be the formula of its halide 1 PX 2 PX PX 3 4 P X3

9 0 The correct order of acidity for the following compounds is CO H CO H HO I OH 1 I II III IV 2 III I II IV In the following sequence of reactions The compound O formed will be II OH CO H III 3 III IV II I OH CO H OH IV 4 I III IV II

Among the following irfactant molecules the surfactant that forms micelles in aqueous solution at the lower CMC at ambient condition is 1 CH CH 15N CH3 3Br 2 CH CH 11OSONa neet prep For a tetrahedral complex MCI the spin only magnetic moment is 3 83 B M The element M is 1 Co 2 Cu High Yielding Test Series Part Test 6 Pa Contact Number 9667591930 852752171

11 When iron is added to CuSO4 solution copper is precipitated It is due to 1 Oxidation of Cu 2 2 Reduction of Cu 2 3 Hydrolysis of CuSO4 4 lonization of CuSO4 Oxidation 1 3 1 Which oxidised

7 Arrange the following alcohols in order of increasing reactivity towards sodium metal 1 CH3 3COH ii CH3 2CH OH iii CH3CH OH 1 iii ii i 2 ii i iii 3 i ii iii 4 iii i ii

23 4 If we plot volume of a certain mass of a gas against temperature at constant pressure we get a straight line interesting on the negative side at 273 C which explains about absolute zero This graph is known as X 273 C 1 Isochore 2 Isotherm 3 Isotone 4 Isobar Which of the following is not an allylic holide 0 T C

For a reaction N O5 Given 2NO d N 05 k N 05 dt d NO dt K N O5 d 0 K3 N 05 dt NI 02 2 The relation between k k and k3 are 1 2k K 4K3 4 1 2 k K K3

The product s obtained via oxymercuration HgSO4 137 H SO4 of but 1 yne would give 11 1 CH3CH C CH3 2 CH CH CH CHO 3 CH CH CHO HCHO 4 CH CH COOH HCOOH 135 A hor sm stic OSC W

3 Two students prepare two cyclohexane solutions having the same mass of cyclohexane Sally uses 1 20 g of a solute and George uses 0 22 g of the same solute Who will observe the larger freezing poin change Explain

80 0 1 M formic acid solution is titrated against 0 1 M NaOH solution What would be the difference in pH between 1 5 and 4 5 stages of neutralization of acid 1 2 log 3 4 2 2 log 1 5 3 log 1 3 4 2 log 4

nuric The ho 115 The rate constant of a particular reaction has the dimensions of a frequency What is the order of the reaction 1 Zero 2 First 3 Second 4 Fractional

20 Correct order of freezing point of given solution I 0 1 M glucose 1 IV II 0 2 M urea 2 IV III 0 1 M 3 IV Nacoun IV 0 05 M CaCl 4 IV Services Limite

4 Ss ring has a crown shape 30 For a gaseous reaction following data is given AB k 10 e 2 2000 T C D K 10 4 1000 7 The temperature at which k k is 1 1000 K 2 2000 K 3 868 82 K 4 434 2 K

3 0 2 g of an organic compound contains C H and O On combustion it yields 0 15 CO and 0 12 g H O The percentage of C H and O respectively is 1 C 15 H 20 O 65 2 C 10 H 8 2 O 81 8 3 C 12 2 H 8 8 O 79 4 C 20 H 6 66 O 73 34

The beta activity of 1g of carbon made from green wood is 15 3 counts per minute If the activity of 1 g of carbon derived from the wood of an Egyption mummy case is 9 4 counts per minute the same conditions how old is the wood of the mummy case Half Life of carbon 5770 yr

4 Anilinium ion has three stable canonical structures I II and III 90 Which of the following compounds will have highest melting point CH3 CH3 CH3 CH3 I 2 11 CH3 3 111 CI CH3 II 4 All have equal melting point Page 16 54

0 Multiple Choice Select 1 out of 4 options for the question below 45 A Pulled wool is obtained from 50 55 Options Lamb Dead sheep Camel Adult sheep Clear Response

Arrange the following alkyl halides in order of dehydrohalogenation C HsI C H5C1 C HsBr C HsF 1 C HsF C H5C1 C HsBr C HsI 3 C HsI C HCl C HsBr C HsF 2 C Hsl C HsBr C HCl C HsF 4 C H F C HCl C HsBr C H5C1

2N O5 4NO O2 the variation of concentra tion of N O5 with time can be expressed by N O5 N O5 o e Kt and K 104 sec If initially 1 mole of N O5 taken calculate i Rate of disappearance of N O at t 10 sec ii Rate of reaction during first 104 sec iii Variation of concentration of NO with time

mass 1 A solution is prepared by dissolving 0 6 g of urea molar 60 g mol and 1 8 g of glucose molar mass 180 g mol in 100 mL of water at 27 C The osmotic pressure of the solution is R 0 08206 L atm K mol 1 2019 Main 12 April II d 1 64 atm a 8 2 atm b 2 46 atm JETA 4 92 atm

88 The y form of iron has fee structure edge length 386 pm and form has bcc structure edge length 290 pm The ratio of density in y form and form is 1 0 848 2 1 02 3 1 57 4 0 6344

1 1 3 2 1 6 3 1 9 4 1 12 7 A solution of sucrose Molar mass 342 has been prepared by dissolving 68 4g of sucrose in one k of water K for water is 1 86 K kg mol The freezing point of the solution will be 1 0 684 C 2 0 342 C 3 0 372 C 4 0 186 C The metal extracted by electrolysis of its fused salt is 8

1 NiSO4 2 BaS O3 3 PbS2O3 The general formula CnH O2 could be for open chain 1 diketones 2 Carboxylic acids 3 diols The ionic product of Ni OH 2 is 2 0 x 10 5 The molar solubility 1 3 2 x 10 2 2 2 0 x 10 3 3 4 34 x 10 2 4 CuSO4 4 dialdehydes of Ni OH 2 in 0 10 M NaOH 4 0 58 x 10

For the elementary reaction MN the rate of disappearance of Mincreases by a factor of 8 upon doubling the concentration of M The order of the reaction with respect to Mis 1 4 2 3 3 2 4 1 Which of the following alcohol s don t does not give white turbidity on treatment with

A 5mL pure liquid toluene dissolved in 100 mL of dil alkaline KMnO4 and refluxed to change to benzoic acid with formation of dark brown precipitate of MnO2 s The precipitate and filterate separated The precipitate redissolved in 100 mL of 1M acidified solution of Na2C204 and excess oxalate required 50 73 mL of 0 1M acid dichromate for back titration The 10 5 mL filterate selected acidified with dil H2SO4 and titrated with 38 mL of 0 1 M Na2C204 under hot conditions at end point Report the molarity of original KMnO4 s integer answer

60 An ideal mixture of two liquids A and B is put in a cylinder containing piston Piston is pulled out isothermally so that the volume of liquid decreases but that of vapours increases Negligibly small amount of liquid was left and mole fraction of A in vapour is 0 4 If P 0 4 and P 1 2 at at the experimental temperature which of the following is the total pressure at which the liquid is almost evaporated 1 0 22 atm 3 0 667 atm 2 0 431 atm 4 1 atm

Ejection of the photoelectron from metal in the photoelectric effect experiment can be stopped by applying 0 5 V when the radiation of 250 nm is used The work function of the metal is A 4 eV B 4 5 eV C 5 eV C 550X

Which of the following statements is false A Molar conductance of a strong electrolyte in water decreases as the electrolyte increases B Molar conductance of a weak electrolyte in water decreases as the electrolyte increases at low concentrations C At low concentrations the specific conductance for a strong electolyte in water increases as the electrolyte concentration increases D The specific conductance for a strong electrolyte in water always increases as the electrolyte concentration increases

The complex Fe H O 5 NO 12 is formed in the brown ring test for nitrates Choose the incorrect statement for the complex Question Type Single Correct Type 1 Its magnetic moment is approximately 3 9 B M 2 The oxidation state of iron is 1 3 The hybridisation of central metal ion is sp d

Question 27 Two open beakers one containing a solvent and the other containing a mixture of that solvent with a non volatile solute are together sealed in a container Over time Options a the volume of the solution decreases and the volume of the solvent increases b the volume of the solution and the solvent does not change c the volume of the solution increases and the volume of the solvent decreases d the volume of the solution does not change and the volume of the solvent decreases H O g the observed rate

Under standard conditions hydrogen gas reacts with Au aq aq ions to produce Au s The net cell potential for the reaction is V record answer to two decimal places ie 1 22 and include the sign in your answer do not include units in your final answer

3 At constant pressure addition of helium to the reaction system N g 3H 2NH 3 8 1 Favours the formation of ammonia 2 Reduces the formation of ammonia 3 Does not affect the position of equilibrium 4 Reduces the dissociation of ammonia

A white solid reacts with dil HCl to give colourless gas that decolourises aqueous bromine The solid is most likely to be sodium carbonate c sodium acetate b sodium chloride d sodium thiosulphate

17 The largest oxidation number exhibited by an element depends on its outer electronic configuration With which of the following outer electronic configurations the element will exhibit largest oxidation number a 3d 4s c 3d 4s of the following P b 3d 4s d 3d5 4s

Which order is correct about acidity 1 CH COOH C H COOH C H OH 3 C6H5OH C6H5COOH CH3COOH The molecule which does not exhibit dipole moment is DY MIL 2001 2 C6H COOH CH COOH C H OH 4 C6H5OH CH3COOH C6H5COOH BILO

4 Ethers are prepared by the reaction of sodium alkoxides and alkyl halides Which of the following reagents should be taken to prepare methyl tert butyl ether 1 CH C Br NaOCH 2 CH Br NaOC CH 3 CH CH Br NaOC CH 4 CH Br NaOCH CH

A fuel cell involves combustion of the butane at at latm and 298 K 13 CH10 O4CO 5H 0 x 1 AG 2746kJ mole The value of Eis nearly A 0 8 V B IV C 1 2 V D 1 4

Be NO3 2 on heating to 125 C gives Answer A B C D Your Attempt BeO NO2 02 BeO NO Correct answer B 40 NO3 6 N205 BeO N 05

Metal can be prevented from rusting by Question Type Single Correct Type 1 Connecting iron to more electropositive metal a case of cathodic protection 2 Connecting iron to more electro positive metal a case of anodic protection 3 Connecting iron to less electropositive metal a case of anodic protection 4 Connecting iron to less electropositive metal a case of cathodic protection

3 N Be C B In the formation of a chloride ion from an isolated gaseous chlorine atom 3 8 eV energy is releas would be equal to 1 Electron affinity of Cr 3 Electronegativity of Cl 2 Ionisation potential of Cl 4 Ionisation potential of Cr

The basic character or MgO BaO Na2O and FeO follow the order 1 MgO FeO BaO Na O 2 FeO MgO BaO Na O 3 FeO MgO BaO Na O 4 Na O MgO FeO BaO The compound formed in the positive test for nitrogen with the lassaigne solution of an orga compound is

103 Consider the nitration of benzene using mixed conc H SO4 and HNO3 If a large amount of KHSO4 is added to the mixture the rate of nitration will be 2 1 slower 2 unchanged 3 doubled 4 faster

7 How many numbers of molecules and atoms respectively are present in 2 8 litres of a diatomic gas at STP 1 6 023x10 7 5 10 3 2 6 023x10 15 10 2 3 7 5 102 15x10 4 15x10 7 5 10

0 At 35 C the vapour pressure of CS is 512 mm Hg and of acetone CH COCH3 is 344 mm Hg A solution of CS and acetone in which the mole fraction of CS2 is 0 25 has a total vapour pressure of 600 mm Hg Which of the following statements about solution of acetone CS is true 1 A mixture of 100 ml of acetone and 100 ml of CS has a total volume of 200 ml 2 When acetone and CS2 are mixed at 35 C heat must be absorbed in order to produce a solution at 35 C 3 When acetone and CS2 are mixed at 35 C heat is released 4 Raoult s law is obeyed by both CS and acetone for the solution in which the mole fraction of CS is 0 25 For an ideal gas number of moles per litre in terms of its pressure P gas constant R and temperature

E A 2 B 4 C 6 D 0 pk of a weak acid is 5 76 and pK of a weak base 5 25 what will be the pH of the salt formed by the two C 10 25 A 7 255 B 7 005 The hybridisation of Pin PO is the same as in D 4 25

1000 ml 2 M CuSO4 is electrolysed by a current of 9 65 amp for 2 hours Which is are correct After After electrolysis remaining concentration of Cu 2 is 1 64 M using Cu electrode After electrolysis remaining concentration of Cut2 is 1 64 M using Pt electrode 3 When remaining concentration of Cut2 is 1 822 then volume of solution is reduced by 10 using Pt electrode 17 17 15 gm copper deposit when current efficiency is 75 using copper electrode

Hydrazine was taken in a constant volume container at 27 c and 1 0 atm and equal moles of oxygen gas were introduced sealed and heated following equlibria established N H4 3022NO2 g 2H O Kp 4 N HN 2H Kp N H H 2NH3 KP3 k The gaseous mixture on passing through moisture absorbent a decrease of 360 mm in equilibrium pressure observed The dried gaseous mixture passed through Ammonia absorber a further decrease of 20 mm in equilibrium pressure observed After calculating Kp2 report the value of KP3