Physical Chemistry Questions

A gas is filled in the glass bulb of capacity 10 litre as shown in figure at 300 K Density of glycerine 2 72 g ml Density of mercury 13 6 g ml Now select the correct statement s among the following A pressure of the gas is 3 28 atm B pressure of the gas is 0 342 atm C moles of the gas in the bulb are 0 34 D moles of the gas in the bulb are 1 33 10 t Glicerine 2 5m Air 1 atm

gas is treated with KOH solution Find out the compo of the gaseous mixture in terms of volume percenta IIT JEE A40g sample contained FeO FeO and inert ma It was treated with an excess of aq KI solution in medium which reduced all iron to Fe ions The res solution was diluted to 50 mL and a 10 mL sampi was taken The iodine liberated in the small samp titrated with 12 0 mL of 0 5 M Na S O3 solution iodine from another 25 mL was extracted after wh Fe ions were titrated with 16 mL of 0 25 M MnO in H SO solution Calculate the mass of two oxide IT JEE To a 25mL H O solution excess of an acidified sol indide was added The iodine liberated r

The rate law for the reaction 0 00181 2 NO g Cl2 g 2 NOCI g is given by the goo rate K NO Cl The reaction occurs in the followi steps to per NOC12 g NOC12 g NO g 2NOCI g Identify the rate determining step 1 NO g Cl2 g ii

When 0 5F of electricity is passed through NaCl solution the amount of chlorine liberated is A 71g B C D skipped 142g 35 5g 17 75g Stry MY

1 Pressure of 0 210 bat ar 37 C The vapour pressure of pure liquid vapour pressure of water at 37 C 0 198 bar in bar is 1 0 448 3 0 224 2 44 8 4 2 24

35 The hydride ion H is stronger base than its hydroxide ion OH Which of the following reaction will occur sodium hydride is dissolved in water 1 Haq H O HgO 3 H H O H O 2 H aq H O OH H 4 H H O No reaction

The normal boiling point of pure water is 373 15K Calculate the boiling point in K of an aqueous solution containing 11 7 gm NaCl and 34 2 gm sugar C H O in 260 gm water For water K 0 52K Kg mol Atomic mass of Na 23 Cl 35 5 SKIPPED

Arrange the following electrolytes in the increasing order of coagulation the coagulation of As2S3 power for solution 1 Na3PO4 II MgCl III AICI 3 Question Type Single Correct Type 1 2 III 3 1 4

Which transition of electron in Li2 would emit the photon whose wavelength will be same as that of photon emitted by Hydrogen atoms corresponding to 2nd line of Balmer series Question Type Single Correct Type 16 12 284 38 2

9 Nitrate of an element of alkali metal group decomposes on heating gives brown colour gas Nitrate and brown colour gas are respectively 1 NaNO3 and NO 2 LINO3 and NO 3 KNO3 and NH3 4 NaNO3 and NO

za 2 56 Lauryl alcohol is obtained from coconut oil and is used to make detergent A solution of 5 g of Lauryl alcohol in 200 g of benzene freezes at 4 C The approximate molar mass of Lauryl alcohol will be Given K of benzene 5 1 C molal Freezing point of benzene 5 5 C Give your answer after division by 17

52 Chromium plating is applied by electrolysis to objects suspended in a dichromate solution according to the following unbalanced half reaction Cr 0 2 aq e H aq Cr s H O 1 How many hours would it take to apply a chromium plating of thickness 2 0 x 10 2 mm to a car bumper of surface area 0 25 m in an electrolysis cell carrying a current of 75 0A Density of chromium is 7 19 g cm 2 1 5 h 3 3 0 h 4 0 25 h 1 2 2 h

of M 10 KIO3 the same stock solution of KI requires 30 mL of M KIO3 under similar conditions calculate the percenta AgNO3 in the sample Reaction KIO3 2KI 6HCl 31C1 3KC1 3H O IIT JEE 1 22 The composition of a sample of wustite is Feo 93 What percentage of iron is present in the form of Fe IIT JEE 23 A is a binary compound of a univalent metal When g of A reacts completely with 0 321 of sulphur evacuated and sealed tube 1 743 g of a white cryst solid B produces which produces a hydrated doub C with Al2 SO4 3 Identify A B and C IIT JEE g 24 A mixture of ethane CH ond othane CH occur

A reversible cyclic process for an ideal gas is shown below Here P V and T are pressure volume and temperature respectively The thermodynamic parameters q w H and U are heat work enthalpy and internal energy respectively RY D Volume V A QAC AUBC and WAB P2 V V A P1 V1 T1 WBC P2 V2 V and qBC AHAC AHCA AUCA and QAC AUBC QBC AHAC and AHCA AUCA B P2 V2 T1 Temperature T C P2 V2 T2

EE When 4 08 g of a mixture of BaO and unknown carbe MCO3 was heated strongly the residue weighed 3 This was dissolved in 100 mL of 1 N HCl The ex acid required 16 mL of 2 5 N NaOH solution for com neutralisation Identify the metal M IIT JEE 1 When 16 8 g of a white solid X was heated 4 4 g acid gas A which turned lime water milky was d off together with 1 8 g of a gas B which condensed colourless liquid The solid that remained Y diss in water to give an alkaline solution which with e barium chloride solution gave a white precipitate Z precipitate effervesced with acid giving carbon dic Identify A B and Y and write the equation for the th decomposition of X 0 IIT JEE WELD If 2 68 x 10 3 mol of a solution containing an io requires 1 61 10 mol of MnO4 for the oxidat Ant to AO3 in an acidic medium then what is the of n bas esta mis IIT JEE borosl When 5 mL of 8 N nitric acid 4 8 mL of 5 N hydroc acid and a certain volume of 17 M sulphuric acid are together and made upto 2 L 30 mL of this ac m exactly neutralises 42 9 mL of sodium carbonate sc containing 1 g of Na CO3 10H O in 100 mL of

Gold number of a lyophilic sol is such a property that Question Type Single Correct Type The larger its value the 1 greater is the peptizing power The lower its value the 2 greater is the peptizing power The lower its value the 3 greater is the protecting power The larger its value the 4 greater is the protecting

hysical Chemistry If equal volumes of 1 M KMnO4 and 1 M solutions are allowed to oxidise Fe II to Fe III medium then Fe II oxidised will be a More by KMnO4 c Equal in both cases b More by K Cr C d Can t be determi Sulphuryl chloride SO Cl reacts with water mixture of H SO4 and HCl Moles of NaOH re neutralise the solution formed by adding 1 mol o excess water is are 1 b 2 c 3 OH d 4 00 mL of 0 01 M KMnO oxidised 100 mL cidic medium Volume of the same KMnO4 re 4 Cel 100

8h Ym dx The total energy of the particle is sum of kinetic energy and potential energy i e Thus or E K E P E E d y h 8 ym dx 2 y 8 h 2 dx m X P E E P E y 0 2 iv This equation is called Schr dinger wave equation in ne dimension x If it is written for a particle whose motion is escribed by three space coordinates x y and z then the above x y an values TH for the obser positi the E nega desc spac qua

4 Standard electrode potentials of Fe 2e Fe and Fe 3e Fe are 0 440 V and 0 036 V respectively The sta dard electrode potential E for Fe e Fe 1 0 476 V 2 0 404 V 3 0 404 V 1 0 772 V

45 When an object is at rest 1 Forces is required to keep it in rest state 2 No force is acting on it 3 A large number of forces may be acting on it which balance each other 4 It is in vacuum 10 32

Note log2 0 3 All data are at 25 C Column I A 1 MXOH aq B PK XOH 6 0 1M C H NH aq PK C H NH 7 C At equivalence point when 20 ml of 0 5M BOH is titrated with 2M HC1 K BOH 1 4 10 M D 20ml 0 125M C H NHCl 5ml 5 10 M HCI K C H N 5 10 0M Column II P H OH Q pH 2 4 R POH 3 S pH 10

gas behaviour calculate the mole fractions of C C H in the mixture IIT JEE 5 A 5 0 mL solution of H O liberates 0 508 g o from an acidified KI solution Calculate the stre H O solution in terms of volume strength at STI IIT JEH A 20 0 mL mixture of CO CH4 and He gases is e by an electric discharge at room temperature with of oxygen The volume contraction is found to be A further contraction of 14 0 mL occurs when the

presence of dilute involved in the reactions and calculate the me H O IIT JE 3 One gram of charcoal adsorbs 400 mL of 0 5 acid to form a mono layer and the molarity of ac reduces to 0 49 Calculate the surface area of adsorbed by each molecule of acetic acid The sur of charcoal is 3 01 10 m g IIT JE Around 20 surface sites have adsorbed N Or N gas evolved form sites and were collected at 0 and 298 K in a container of volume 2 46 cm The of surface sites is 6 023 1014 cm 2 and surfac 1000 cm Find out the number of surface sites c per molecule of N UIT JEE

31 For the decomposition reaction NH COONH4 s 2NH3 g CO g the Kp 2 9 x 105 atm The total pressure of gases at equilibrium when 1 mol c NH COONH4 s was taken initially coul be 1 0 0194 atm 3 0 0582 atm 2 0 0388 atm 4 0 0766 atm

7 A 0 13 g of a specimen containing MnO IS 5 iodide ions If iodine liberated requires 30 0 mL of 0 075 M solution of Na S O3 the percentage of MnO in the mineral is a 75 3 b 85 3 c 95 3 d None KA Mod at 8 The mass of K Cr O required to produce 5 0 L CO 77 C and 0 82 atm pressure from excess of oxalic acid 6 b and volume of 0 1 N NaOH required to neutralise the CO evolved respectively are 1 mens b 5 g 1 86 L d None a 7 g 2 86 Lister c 4 g 0 86 L 59 A mixture of Na C O and KHC O4 H C O4 required equal volumes of 0 2 M KMnO4 and 0 2 M NaOH separately m

500 mL of a gaseous hydrocarbon when burnt i 2 2 excess of O gave 2 5 L of CO and 3 0 L of wate vapours under same conditions Molecular formul of the hydrocarbon is 1 CH 3 C H 0 2 C H 0 10 4 C H 2 I

COO 116 Given the ionic conductance of COO 74 50 and 73 cm ohm eq respectively The equivalent COONa conductance at infinite dilution of the salt COOK 1 197 cm ohm eq 2 172 cm ohm eq 3 135 5 cm ohm eq 4 160 5 cm ohm eg 9 K and Na are is

Consider following graph of adsorption x mass of gas absorbed on mass m of adsorbent x E m x E Pressure Graph A Select the correct statement 1 Graph A is for multilayered adsorption 2 Graph B is for monolayered adsorption 3 Graph A is for chemisorption 4 Graph B is for chemisorption Pressure Graph B

Match the properly given in column I with the compound given in column I Column I a Soluble in concentrated ammonia solution b Soluble in excess KCN solution c Soluble in excess hypo solution D Soluble in conc HCI Column II P Ag S Q Cu OH R AgBr S AgCl

ger Type 1 The volume in mL of 0 1 M AgNO for precipitation of chloride ions present in 30 mL solution of Cr H O CIJCL as silver chloride IIT JI to Reaction of Br with Na CO3 in aqueous solut sodium bromide and sodium bromate with of CO gas The number of sodium bromide r involved in the balanced chemical equation is UT JE

53 From the figure in which of the following vessel the pressure of the gas is th highest Temperature and volume of the gases are the same in each vessel P Polm R S Q 1 mol He 1 mol SO 1 mol H 1 mol CH4 lg Charcoal A Q C R 1g Charcoal y a lg Charcoal B P D S lg Charcoal

21 rms 3PV M u rms P 1 2 Here P 800 mm 80 cm V 22 600 mL M 71 g mol 273 80 13 6 981 dyn cm 800 3 80 13 6 981 22 600 71 0 1018 x 105 cm s 22 600 12 llustration 5 86 Two flasks A and B have equal volume A is maintained at 300 K and B at 600 K While A contains H gas B has an equal mass of CH4 gas Assuming ideal behaviour for both the gases which of the following statement is true about the velocities of molecules a The molecules in flasks A and B are moving with the same velocity b The molecules in flask A are moving two times faster

Fe SO 9H 0 solution for complete oxidation Calculate the num of gram mole of hydrated ferric sulphate in mixtu b The vapour density of a mixture consisting of and N O is 38 3 at 26 7 C Calculate the numbe moles of NO in 100 g of the mixture IT JEE 19 In the analysis of 0 500 g sample of feldspar a mix of the chlorides of sodium and potassium is obtai which weighs 0 1180 g Subsequent treatment of mixed chlorides with silver nitrate gives 0 2451 of a si chloride What is the percentage of sodium oxide IIT JEE 19 potassium oxide in feldspar If 5 mL of a gas containing only carbon and hydre is mixed with an excess of oxygen 30 mL and mixture is exploded by means of an electric spark volume of the mixed gases become 25 mL On addi concentrated solution of potassium hydroxide the vol further decreases to 15 mL and the residual gas being oxygen All volumes have been reduced to STP Calc the molecular formula of the hydrocarbon gas IIT JEE 1 a Take 1 L of a mixture of CO and CO Pass this mi through a tube containing red hot charcoal The now becomes 1 6 L The volumes are measured u the same conditions Find the composition o mixture by volume

32 Hydrogen peroxide solution 20 mL reacts quar with a solution of KMnO4 20 mL acidified w H SO4 The same volume of the KMnO4 soluti decolourised by 10 mL of MnSO4 in a neutral simultaneously forming a dark brown preci hydrated MnO The brown precipitate is dissol mL of 0 2 M sodium oxalate under boiling condit presence of dilute H SO4 Write the balanced involved in the reactions and calculate the m H O IT IF

27 Equivalent weight of MnO in acidic neutral and media are in ratio of c 5 1 13 d 3 15 a 3 5 15 b 5 3 1 28 NH OCIN H CI On balancing the above equation in basic solution integral coefficient which of the following whole nu will be the coefficient of N H a 1 b 2 c 3 d 4 9 In an experiment 50 mL of 0 1 M solution of a metall reacted exactly with 25 mL of 0 1 M solution of so sulphite In the reaction SO 2 is oxidised to SO original oxidation number of the metal in the salt w what would be the new oxidation number of the me a 0 b 1 c 2 d 4 20 mL of x M HCl neutralises completely 10 mL c M NaHCO solution and a further 5 mL of 0 2 M Na solution to methyl orange end point The value of x a 0 167 M b 0 133 M c 0 15 M d 02 M

200 units of energy is required to take away electron from the lowest energy level to infinity The energy released when electron falls from infinite level to the second shell Assuming Bohr model to be applicable will be Question Type Single Correct Type 1 100 units 2 400 units 3 50 units A 25 unito

1 Some of the batteries have alkaline electrolytes I Mercury battery II Nickel cadmium III Modified Leclanche cell Cell potential is independent of OH in b I and II d Only III a I II and III c II and III

0 0167 M solution of an oxidant for titrati number of electrons taken up by the oxidant in the reac of the above titration IIT JEE 19 20 A 2 0 g sample of a mixture containing sodium carbo sodium bicarbonate and sodium sulphate is gently he till the evolution of CO ceases The volume of CC 750 mm Hg pressure and at 298 K is measured t 123 9 mL A 1 5 g of the same sample requires 150 m M 10 HCl for complete neutralisation Calculate percentage composition of the components of the mix IIT JEE 15 1 One gram of commercial AgNO3 is dissolved in 50 of water It is treated with 50 mL of a KI solution silver iodide thus precipitated is filtered Excess C in the filtrate is titrated with M 10 KIO solution presence of 6 M HCl till all I ions are converted int

Chromium metal is plated using the following reaction in acidic solution CrO3 6H 6e Cr 3H O How many grams of chromium will be plated out by 24 000C Atomic mass of chromium is 52 A 1 1554g B 2 1554g skipped

increases on dilution because of 1 Increase in number of ions per unit volume 2 Increase in molecular attraction 3 Increase in degree of association 4 Increase in degree of ionisation of th substance

IIT JEE Hydroxylamine reduces iron III according to following reaction 20MG 2NH OH Fe N O g T H O 4Fe2 4H Iron II thus produced is estimated by titration w standard permanganate solution The reaction is MnO 5Fe 8H Mn 5Fe 4H O A 10 mL sample of hydroxylamine solution was dilute L When 50 mL of this diluted solution was boiled w excess of iron III solution the resulting solution re 12 mL of 0 02 M KMnO4 solution for complete oxi of iron II Calculate the weight of hydroxylamine of the original solution H 1 N 14 0 16 K 39 Mn 55 Fe 56 IIT JEE An organic compound CH O was burnt with the amount of oxygen needed for complete com to CO and H O The hot gases when cooled to 0 atm pressure measured 2 24 L The water collected cooling weighs 0 9 g The vapour pressure of pure 20 C is 17 5 mm Hg and is lowered by 0 104 mm g of the organic compound is dissolved in 1000 g organic comp

Q 66 following A RO BBT C NH D R OH Q 67 Chloronium ion is formed by the reaction of Alkyl chloride on aluminium chloride B Chlorine on ferric chloride C HCI on AICI D HCI on HNO Q 68 CH CH C Br KOH ag dailt CH Q 67 0 68 A RO B Bf C NH D R OH A AICI TE B dfas a C AICI E D HNO T CH

Illustration 7 130 H and I are mixed at 400 C in a 1 0 L container and when equilibrium is established the following concentrations are present HI 0 8 M H 0 08 M and 12 0 08 M If now an additional 0 4 mol of HI is added what are the new equilibrium concentrations when the new equilibrium H g L g 2HI g is re established

Ompound contains 28 percent of nitrogen and 72 ent of a metal by weight Three atoms of the metal bine with two atoms of N Find the atomic weight e metal 10 bonisane 04 IIT JEE 1980 me equivalent weight of H PO4 in the following n or fol olhosle booubor doble mulbom OH 2 H PO4 CaHPO4 2H Outoz leme ods ai borgiseld IIT JEE 1980 xylamine reduces iron III according to the ing reaction Im 2528d thai OH Fe N O g H O 4Fe2 4H I thus produced is estimated by titration with a section is Th C S 12 a 10 13

Calculate the value of Avagadro number from the following data Density of NaCl 2 165 g cm 3 distance between Na and CI ions in NaCl crystal 281 pm Question Type Single Correct Type 1 1 52 x 1023 23 04 x 1023 3 6 09 x 1023 X

Which of the following is not correct 1 Molar conductance of a solution increases with dilution 2 Equivalent conductance increases with dilution 3 Specific conductance increases with dilution 4 At infinite dilution each ion cation or anion plays a definite role towards electrical conductance

2 Example 7 26 N and O combine at a given temperature to produce NO At equilibrium the yield of NO is x percent by K a b volume Ifx Ka b where K is the equilibrium 4 constant of the given reaction at the given temperature and a and b are the volume percentage of N and O respectively in the initial state Report the maximum value of K at which X is maximum 9

5 As the dilution of an electrolyte increases 1 Specific conductance decreases 2 Molar conductance decreases 3 Resistance increases 4 No change takes place in conductance

The conduction of electricity through the electrolyte solution is due to 1 Movement of molecules of electrolyte 2 Movement of ions of electrolyte 3 Movement of separate atoms 4 Movement of particles of the solvent

16 An acid solution of 0 2 mol of KReO was reduce Zn and then titrated with 1 6 Eq of acidic KMnO4 sc For the reoxidation of all the rhenium Re to the per ion ReO4 Assuming that rhenium was the only e reduced what is the oxidate state to which rheniu reduced by Zn a 1 b 2 c 1 d 2 7 A 200 mL solution of I is divided into two L parts Part I reacts with hypo solution in acidic and requires 8 mL of 2 M hypo solution for ce neutralisation Part II was added with 300 mL of 0 1 M NaOH s