Physical Chemistry Questions

2 The molar heat capacity Cpm of SO g is described by the following equation over the range 300 K 1700 K Cp m 3 093 6 967 10 45 81 10 7 1 035 10 In this equation T is the R T K 7 K T K Th absolute temperature in Kelvin The ratios ensure that Cpm has the correct dimension K Assuming ideal gas behavior calculate q w AU and AH if 1 mol of SO g is heated from 75 to 1350 C at a constant pressure of 1 bar Explain the sign of w

Standard electrode potential of Fe2 Fe couple is 0 44 V and that of Agt Ag couple is 0 80 V These two couples in their standard state are connected to make a cell The cell potential will be 0 80 G OPTIONS MARK FOR REVIEW CLEAR SELECTION OA 1 24 V OB 1 10 V C 0 36 V OD 1 54 V 0 44 G

Mechanism of a hypothetical reaction 2XY is given below X2 Y 1 X X X fast ii X Y2XY Y slowest iii X Y XY fast The overall order of the reaction will be a 1 b 2 c 0 d 1 5

Three lines are drawn from a single corner of an FCC unit cell to meet the other corner such that they are found to pass through exactly 1 Octahedral void only no voids Octahedral void only Identify the line in the same order 1 Edge Face diagonal Body diagonal 2 Face diagonal Edge Body diagonal 3 Body diagonal Face diagonal Edge 4 Edge Body diagonal Face diagonal

ALLEN On heating with dil H SO4 which of the 78 A following salt gives out a gas that turns an acidified K Cr O paper green 2 NaHSO 4 BaCl 1 Na CO3 3 Pb NO3 2 Bra 2X 2Br X 79 al K Cr 1 Na CO3 2 NaHSO 3 Pb NO3 2 4 BaCh Br 2X 2Br X

4 Glycerol 2 moles of an ideal gas monoatomic is subjected to isothermal compression upto half of its initial volume and then allowed to undergo isothermal expansion upto 2 3rd of its original volume The value of AU change in internal energy in the entire process is 1 2J 3 6J 2 3J 4 O relation is are correct for the

the initial concentration of the reactant A is 4 mol L The time required for its concentration to change from 0 40 to 0 20 mol L 1 is OPTIONS CLEAR SELECTION OA 0 75 min OB 2 min MARK FOR REVIEW O C 12 min

In collision theory of chemical reaction ZAB represents 1 the fraction of molecules with energies greater than Ea 2 the collision frequency of reactants A and B 3 steric factor 4 the fraction of molecules with energies equal to F

Consider the reaction N g 3H g 2NH3 g The equality relationship between d NH3 dt and d H dt is 1 d NH3 dt 1 3 d H dt 2 d NH3 dt 2 3 d H dt 3 d NH3 dt 3 2 d H dt 4 d NH3 dt d H dt

7 If two and B are prepared by dissolving in 250 g of water and 45 g of suga in 250 g of water respectively then the difference in concentration w w of two solutions i approximately 1 2 14 3 9 21 2 4 54 3 92

Here pls tell all coordination no From 1 to 6 with distance Also in ques nearest neighbour of X will be X atoms only or y atoms only or both Thanks Loun In a CCP structure of compound XY atom X is present at octahedral voids The ratio of 6th C N and 3rd C N for an atom X located at body centre is 1 3 2 1 3

2 When a 50 0 mL volume of a 0 858 mol L solution of H O decomposes in the presence of 10 0 mL of a Fe NO3 3 catalyst the temperature of the solution rises 16 7 C Assuming 1 0 g mL density for the 60 0 mL of solution a specific heat of 4 18 J g C for the solution and a heat capacity of 10 0 J C for the calorimeter a Calculate the total heat released by the decomposition of the 50 0 mL of the H O solution b Calculate the enthalpy heat change for the decomposition of H O in units of kJ mole ve for 2a and 2b

For the reaction N2O5 g 2NO2 g 02 9 the value of rate of disappearance of N O5 is given as 6 25 103 mol L s The rate of formation of NO2 and O is given respectively as 1 6 25 x 10 mol L s and 6 25 10 mol L s 1 2 1 25 x 10 2 mol L and 3 125 10 mol L s 1 3 6 25 10 mol L s and 3 125 10 mol L s 1 4 1 25 x 10 2 mol L s 1 and 6 25 10 mol L 5 1

A first order reaction has a rate constant of 2 303x10 s The time required S for 40 g of this reactant to reduce to 10 g will be Given that log10 2 0 3010 1 230 3 s 2 301 s 3 2000 s

Assuming nuclei and atoms to be spherical their radii are known to be of the order of 10 13 cm and 10 8 cm respectively The fraction atomic volume occupied by the nucleus would be A B C D 10 14 10 15 10 16 Marks 4 00 10 17

Select the correct statement s a Rate constants are never negative b Partial orders are never negative c Molecularity and order of reaction both are equal for elementary reactions d Order of reaction may be change with change in practical conditions temp and pres Select the correct statement s

Select the correct option s for NH4 3PO4 Ratio of number of oxygen atoms to number of hydrogen atoms is 1 3 D Ratio of number of cation to number of anion is 3 1 Ratio of number of gm atom of nitrogen to gm atoms of oxygen is 3 4 Total number of atoms in one mole of NH4 3PO4 is 20

During the kinetic Study of the reaction 2A B C D following results were obtaine Run A mol L B mol L 1 I 0 1 0 1 0 3 0 2 0 3 0 4 IV 0 4 0 1 Initial rate of formation of D mol L min 6 0x10 7 2x10 2 88x10 2 40X10 Based on the above data which one of the following is correct 1 rate K A B 2 rate K A B 3 rate K A B 4 rate K A B

Two bulbs of volumes 200cm and 100 cm3 are connected by a short tube containing an insulating porous plug that permits equalization of pressure but not of temperature between the bulbs The system is sealed at 77 C when it contains oxygen under a pressure of 1 bar The small bulb is now placed at 27 C and the large bulb is placed at 127 C Neglecting thermal expansion of the bulbs select the correct options Final pressure inside the system would be greater than 1 bar O Final pressure inside the system would be less than 1 bar Number of moles of O would increase in small container compared to initial Number of moles of O would increase in big container compared to initial

12 Consider an ionic solid MX with NaCl structure Construct a new structure Z whose unit cell is constructed fr the unit cell of MX following the sequential instructions given below Neglect the charge balance JEE 201 i Remove all the anions X except the central one ii Replace all the face centered cations M by anions X iii Remove the the corner cations M iv Replace the central anion X with cation M The value of Number of anions Number of cations in Z is

t1 4 can be taken as the time taken for 3 4 concentration of reactant to drop to of its initial value If the rate constant for a first order reaction is k then t1 4 can be written as O 0 10 k 0 29 k 0 69 k 0 75 k

Column I Structure A atoms are present at corners as well as on edge centre B atoms are present at corners as well as on face centre C atoms are present at corners as well as on body centre D atoms are present only at corners Column II Packing effici p 6 q 3 7 8 r 12 s 2 6

For the cell concentrations Al s 3Ag aq 0 10M AI 3 0 30M 3Ag s the measured voltage Ecell is 1 50 volt Calculate E cell 2 303RT Given F A B C D 0 06 log 3 0 48 1 5496 volt 1 5496 volt 1 4032 volt 1 2 500 volt

Generally metal oxide are basic and non metal oxide are acidic in nature The hydrolysis of oxide can form hydroxide or oxyacid depending upon the nature of oxide Which of the following statement is are CORRECT 0 C120 is the suboxide of carbon having non cyclic structure 0 Boric acid is act as non proton donor weak tribasic acid Metaphosphoric acid having same basicity as number of P present in it In H S O5 S O S linkage is present and both S is sp hybridised

Which of the following statements is correct for spin quantum number I 2 indicates clockwise spin 1 2 indicates anti clockwise spin

pH of a Buffered Solution Using tabulated Ka and Kb values calculate the pH of a solution made by mixing 105 00 mL of 0 900 M HOCI with 65 00 mL of 0 650 M NaOH The answer is 7 36 please help explain how to get the answer Thanks

For s reaction activation energy Ea 0 and the rate constant at 200 K is 1 6 X 106s 1 The rate constant at 400K will be Given that gas constant R 8 314 J K mol 1 1 3 2 x 104 1 S 2 1 6 x 106 s 1 3 1 6 x 10 1 4 3 2 x 106 1

Which of the following statement is correct A C D Schottky defect is a type of non stoichiometric defect Metal deficiency defect is type of stoichiometric defect Frenkel defect is a type of stoichiometric defect Metal excess defect is a type of stoichiometric defect

18 The calibration curve for the chromatographic determination of isooctane in a hydrocarbon mixture was described as Y 2 09 C 0 26 where C is in mole percent A peak area of 2 65 was obtained for a given sample of hydrocarbon What is the mole percent of isooctane in the given sample A 0 144 C 2 144 B D 1 144 0 149

40 A mixture of gases contains H and O gases in the ratio of 1 4 w w What is the molar ratio of the two gases in the mixture AIPMT 2015 1 2 1 3 4 1 2 1 4 4 16 1

Consider given reaction aMnO42 bH Select correct statements s cMnO4 dMnO2 cH O Above reaction is example of disproportionation reaction 2 n factor of MnO4 is Sum of a c d is 5 Stoichiometric co efficient of H is 6

Similar to labelling of oleum a mixture of H PO and P O is labelled as 100 x where x is maximum mass of water which can reacts with P40 present in 100 gm mixture of H PO and P40s Atomic mass P 31 P O H O H PO Label one such sample where mass traction of P O is 0 44 118 4 n 121 50 132 20

If the radius of the anion in an ionic solid is 200 pm what would be the radius of the cation that fits exactly into a cubic hole Question Type Single Correct Type 1 2 3 146 4 pm 82 8 pm 45 pm

The reduction of NO gas by H gas as represented below 2NO 2H N 2H O takes place in the sequence of following steps I NO NO N 0 II N O H N O H O slow III N O H N H O fast The reduction follows the rate law d N dt K NO H If K 6 6x10 mol L min and K the rate constant of step ll be 3 0x10 mol L min the numerical value of the equilibrium for the step I is ax102 Find the value of a

Topic Syllabus 1 2 46 If 2 mole of hydrocarbon on combustion gives 4 moles of CO and 4 moles of H O Formula of hydrocarbon is 1 C H 2 C H 3 CH 4 C H 46 2 4 1 C H 2 CH 3 C H 4 C H

for each of the following common organic reactions describe the differences in the IR spectra of the reactant and product that would enable you to tell that each reaction successfully took place To justify your answer stay the distinctive signals bond type and approximate stretching frequency of the reactant that you would expect to disappear change and state the distinctive signals of the product that you would expect to appear consider shape and intensity of the signals But there is no need to discuss signals that you would expect to be approximately the same in both molecules NH3 NH

99V All containers have same moles of gas at same temperature If pressur there are 99 containers having volume V 2V 3V f first container is 1 atm then final pressure in torr when all stop cocks are opened is

Four successive members of the first row 86 transition elements are listed below with atomic numbers Which one of them is expected to have the highest oxidising character EO M M 1 Cr Z 24 3 Fe Z 26 2 Mn Z 25 4 Co Z 27 nic configuration of 197 to start an and an ang and g E a fan antare e far 2 1 M 1 Cr Z 24 3 Fe Z 26 Y wi 2 Mn Z 25 4 Co Z 27

3 Pb NO3 2 Br 2X 2Br X Cl 2Y 2Cr Y The incorrect match regarding above reaction is 1 X 1 2 Y 1 3 X Cl 4 Y Br Select species which is planar at nitrogen 4 BaCl 79 80 3 Pb NO3 2 Br 2X Cl 2Y uten arfufaen 1 X 1 3 X Cl 2 NaHSC 4 BaCl 2Br X 2Cr Y for a fe 2 Y 1 4 Y Br

Consider how best to prepare one liter of a buffer solution with pli 3 66 using one of the weak acid conjugate base systems shown here Weak Acid Conjugate Base K pk HC 0 C 0 6 4 x 105 4 19 H PO HPO HCO co 6 2 x 10 4 8 x 10 11 7 21 10 32 How many grams of the potassium salt of the weak acid must be combined with how many grams of the potassium salt of its conjugate base to produce 1 00 L of a buffer that is 1 00 M in the weak base grams potassium salt of weak acid

Which is are correct statements about following equilibrium N O4 g 2NO g Degree of dissociation of N O4 g increases when temperature increases O Vapour density of gaseous mixture decreases when temperature increases O Partial pressure of NO decreases when Helium gas added under constant pressure Partial pressure of N O4 increases when Helium gas added under constant volume

The correct relationship between molality m and molarity M of a solution is d density in g ml E m d M 1000 Ma M solute M 1000 d M solvent d M solute 1000

Which of the following will react at the highest rate 1 1 mol of A and 1 mol of B in a 1 L vessel 2 2 mol of A and 2 mol of B in a 2 L vessel 3 3 mol of A and 3 mol of B in a 3 L vessel 4 All would react at the same rate

For a electrolyte A By which of the following is correct for kohlroush law Aq x Aa Av Y A Br X B Am X Am AY y Am gr B Aeq xea Ay Bx X y Aq X Am Ax y Am By

A mixture of two non reacting gases 80 g of argon and 100 g of neon is taken in a cylinder of volume 100 cm at 25 bar At constant temperature the gaseous mixture is compressed to 50 cm The partial pressure approximately of argon and neon on compression will be respectively 1 14 bar and 36 bar 2 7 bar and 18 bar 3 36 bar and 14 bar 4 28 bar and 72 bar

Which one is correct about given P V plot for 2 mole an ideal gas s Given CA Is Isothermal process 1 atm P 0 5 atm B C 20 40 Volume litre A WAB 20 L atm B AU for Cycle 0 C AS Cycle 0 D WCA 13 86 L atm

two reactions occur in different container at same temperature that are Reaction 1 P Q Rate constant K s1 Reaction II A B Rate constant K S 1 Both reactions start at the same time and it is found rate of reaction I is four times of rate of reaction ll at the start If half life of reaction Il is two times of half life of reaction 1 Then select the correct statement 1 Initial concentration of P is two times of initial concentration of A 2 Initial concentration of P is four times of initial concentration of A Initial concentration of A is two times of initial concentration of P 4 Initial concentration of A is four times of initial concentration of P Aakash Education no Limited Read Office Aak

In chromatography if a solute does not separate and remains on the start line the solute is insoluble in the solvent the solute is soluble in the solvent the solvent is insoluble in the solute the solvent is soluble in the solute

97 If S O SO SO 0 SO AH 298 2 AH 98 7 SO3 H O H SO AH 130 2 H 0 H O AH 287 3 Then the enthalpy of formation of H SO4 298 K is 1 814 4 kJ 3 320 5 kJ 2 650 3 kJ 4 433 5 kl

Which of the following is are true regarding FCC unit cell a edge length of unit cell r radius of lattice point A The smallest distance between an octahedral void and tetrahedral void is a 4 a B The smallest distance between two octahedral voids is 2 3 C The smallest distance between two tetrahedral voids is a 2 D The smallest distance between planes of two successive layers in ABC ABC typ