Physical Chemistry Questions

10 c 1 38 x 10 3 d 7 3 10 4 148 Find moles of NH4Cl required to prevent Mg OH 2 from precipitating in a litre of solution which contains 0 02 mole of NH3 and 0 001 mole of Mg 2 ions b Given K NH3 10 5 Ksp Mg OH 10 b 2x10 3 a 10 4 c 0 02 d 0 1 149 What mass of AgI will dissolve in 1 0 L of 1 0 M NH Neglect chango SNITT

22 23 24 2 dy d A solenoid 1 5m long and 0 4cm in diameter possesses 10 turns cm A current of 5 A flows through it The magnetic field at the axis inside the solenoid is 3 4x 10 T 1 2 10 T 2 2xx 10 T 4 4 10 T If two mirrors are kept at 60 to each other then the number of images formed by them is 1 5 2 6 3 7 4 8 If the balance length corresponding to points B and C is 40cm on the potentiometer wire the balance

For the reaction SO g 0 g SO g if K K RT where the symbols have usual meaning then the value of x is Assuming ideality 1 1 2 12 2

The equilibrium constant of mutarotation of a D glucose to B D glucose is 1 8 What percent of the a form remains under equilibrium 1 35 7 2 64 3 3 55 6 4 44 4

R Orbital angular momentum depends on orientation of orbitals A Energy of electron is taken negative R Energy of electron at infinity is zero

In which of the following reaction hydrogen is acting as an oxidising agent 1 With iodine to give hydrogen iodide 2 With lithium to give lithium hydride 3 With nitrogen to give ammonia 4 With sulphur to give hydrogen sulphide

54 55 CH H C 3 4 Containers A and B have same gases Pressure volume and temperature of A are all twice as that of B then the ratio of number of molecules of A and B are 1 1 2 2 1 4 3 4 1 4 2 1 Which of the following ion is expected to have highest value of molar conductivity at infinite

Consider the reaction ICI g Cl g ICl3 s The AG of the reaction is 17 09 kJ mol Calculate the AG in kJ mol for the reaction at 298 K if the partial pressure of ICI g is 0 0260 atm and the partial pressure of Cl g is 0 00100 atm

If density of a gaseous mixture of dinitrogen tetroxide N O and nitrogen dioxide NO 127 C and 1 atm pressure R 0 08 atm lit mole K Partial pressure of N O is A 0 62 atm B 0 47 atm LIC 0 74 atm D 0 26 atm p

Q20 20 ml of 0 8 M HA solution is neutralised by 0 2 M NaOH solution at 25 C pH of resulting solution at equivalent point is pKb of A 8 log2 0 3 ID Q 529166 Options are A 2 6 B 9 6 C 4 4 D 10 4

The inactivation of a viral preparation in a chemical bath is found to be a first order reaction The rate constant for the viral inactivation if the beginning 1 5 of the virus is inactivated per minute is Given In 100 0 01511 AAJ KA TOPPER 98 5 2 2 5 10 sec 1 1 25x10 sec 3 5 10 sec 4 2 5x10 min Consider the following standard electrode potentials in volts in aqueous solution

Using the data in Appendix 4 what is the standard change in entropy in J K for the reaction 2Ag s Br 1 2AgBr s Don t include units in the answer

Consider an ionic solid MX with NaCl structure Construct a new structure Z whose unit cell is constructed from the unit cell of MX following the sequential instructions given below Neglect the charge balance i Remove all the anions X except the central one ii Replace all the face centered cations M by anions X iii Remove all 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

na Bohr s model of an atom when an umps from n 1 to n 3 how much ene me emitted or absorbed 1 2 389 10 12 ergs 2 0 239 x 10 10 ergs 3 2 15 x 10 11 ergs 4 0 1936 10 10 ergs

09 Indium Antimonide InSb is a semiconductor material and it has the zinc blende structure The atomic radii of In and Sb atoms are in 1 44 and rsb 1 36 respectively Assume that the ions as touching hard spheres Molar masses In 114 8 g and Sb 121 7 g a Draw a sketch of a InSb unit cell b How many In2 ions belong to a unit cell c What is the coordination number of In ions d How many Sb ions belongs to a unit cell e Calculate the unit cell constant of the InSb unit cell www f Calculate the density of InSb

In carius method of estimation of halogen 0 2 g of an organic compound gave 0 188 g of AgBr The composition of bromine in the compound is molecular mass AgBr 188 u atomic mass Br 80 u 40 30 20

30 The energy of second Bohr orbit of the hydrogen a is 328 kJ mol hence the energy of fourth E orbit would be AIPMT Prelims 20 1 41 kJ mol 2 1312 kJ mol

A reaction mixture has been made by taken equal conc of two reactants It 40 minutes for the completion of 50 of the reaction For the completion of next 50 of reaction time taken is 80 min What is the order of reaction 1 2 3 3 2 0 4 1

The shape of XeO3 is a T shaped c Triangular planar d b Tetrahedral d Pyramidal

A common laboratory preparation for O gas involves the thermal decomposition of potassium nitrate 2KNO3 s 2KNO2 s O2 g What volume of O at 18 C and 1 29 atm pressure can be produced from the decomposition of 37 9 g of KNO3 What volume of O at 17 C and 1 15 atm pressure can be produced from the decomposition of 21 1 g of KNO33

If the radiation corresponding to the second line of Balmer series of Li2 ion knocked the electron from the first excited state of H atom what is the kinetic energy of electron in eV A 19 55 B 21 68 c 27 68 D 30 10

a 10 4 b 2x 10 3 c 0 02 d 0 1 149 What mass of AgI will dissolve in 1 0 L of 1 0 M NH 3 Neglect change in conc of NH3 Given Ksp AgI 1 5 x 10 6 K Ag NH3 2 1 6 107 At mass Ag 108 1 121 b 0 0056 g d 0 011 g c 0 035 g 150 Consider the following statement and select correct option a 4 9 10 5 X g 0 38 O TZ m1

27 For the reversible gaseous reaction T 2HI g the value of K for the reaction H2 8 12 8 7 8 g H 203 2 g 1 and 1638 4 g of HI were found at equilibrium Calculate Ans 0 019

What is the relation between the equilibrium constants K and K of following reversible reaction H g 12 g 2HI g and 2HI g H g 1 g Ans K What is the relation between equilibrium constants K and K for the following reactions 1

Henry s law constant for the molality of methane in benzene at 298 K is 4 27x10 mm Hg Calculate the solubility of methane in benzene at 298 K under 760 mm Hg 1 2 56 10 2 1 78 10 3 3 78x102 4 4 13x10 Choose the incorrect statement 1 The shape of an atomic orbital depends upon the azimuthal quantum number 2 The orientation of an atomic orbital depends upon the magnetic quantum number 3 The energy of an electron in an atomic orbital of multi electron atom depends only on principal

Calculate the percent ionization of nitrous acid in a solution that is 0 266 M in nitrous acid HNO2 and 0 112 M in potassium nitrite KNO The acid dissociation constant of nitrous acid is 4 50 x 10 4 O 11 2 O 0 399 O2 974 296

MAS 4 gram of NaOH are present in 500 mL of aqueous solution What is the active mass of NaOH 17 gram of ammonia gas is present in 2 litre flask Calculate the active mass of the gas Ans 0 2 Ans 0 5

3 If each orbital can hold a maximum of 3 electrons the number of elements in 4th period of periodic table long form is a 48 2 27 b 54

The rates of a certain reaction at different times are as follows Time 0 10 20 30 The reaction is 1 First order 3 Zero order Rate mol litre sec 2 8x10 22 2 78 10 2 2 81x10 2 79 10 2 Second order 4 Third order

PHYSICS A rod P of length Im hinged at one end A and there is a ring attached to the other end Another long rod Q is hinged at B and it passes through the ring The rod P is rotated about an axis which is perpendicular to the plane in which both rods are present and the variations between the angles and are plotted as shown The distance between the hinges A and B is 113m B 2 1 m P 3 2m 0 4 2 2 m

At nos Mn 25 Fe 26 Co 27 Ni 28 5 Which of the following is not among shortcomings of Bohr s model 1 Bohr theory could not account for the fine lines in the atomic spectrum 2 Bohr theory was unable to account for the splitting of the spectral lines in the presence of magnetic field 3 Bohr theory failed for He atom 4 It did not give information about energy level

2 Absolute temperature is the tempera which a all molecular motion ceases b bolume becomes zero c mass becomes zero d none of the above

3 1 2 If H SO ionises as H SO4 2H O 2H O SO then total number of ions produced by Molar and 1L aqueous H SO4 will be 2 3 01x10 2 4 1 8x10 4 1 1 9 03 10 3 6 02 10 A micelle formed during the cleansing action by soap is

During the experiment a student determined that 19 50 ml NaOH solution from problem 2 was used to titrate a 6 00 mL of a vinegar sample Determine the concentration as mass of acetic acid HC H30 in the vinegar density if vinegar 1 02 g mL MM acetic acid 60 05 g mol

1 Ba 2 Ba 3 Ba The pH value of decinormal solution of NH OH which is 20 ionized is 1 13 30 2 14 70 3 12 30 4 12 95 Among the following the compound that is both paramagnetic and coloured is 1 K Cr O 2 KMnO 3 COSO 4 K Cu CN 141 4 B

28 A solution of protein extracted from crabs was prepared by dissolving 0 75 g in 125 cm of an aqueous solution At 4 C an osmotic pressure rise of 2 6 mm of the solution was observed Then molar mass of protein 3 is Assume density of solution is 1 00 g cm a 9 4 x105 b 5 4 x 105 d 9 4 1010 c 5 4 1010

platinum wire loop of the salt with concentrated HCI When he takes a small amount of this J KA TOPPER paste and keeps it in a non luminous Bunsen flame the colour of the flame changes to grassy green He should therefore conclude that the metal is 1 Barium 2 Calcium 3 Potassium 4 Strontium

1 19 Ferric oxide crystallises in a hexagonal close packed array of oxide ions with two out of every three octahedral holes occupied by ferric ions Derive the formula of the ferric oxide 1 20 Classify each of the following as being either comiconductor ile9 p type or a n type

5 The energy of electron in first energy level is 21 79x 10 12 erg per atom The energy of electron in second energy level is a 54 47 x 10 12 1 erg atom b 5 447x 10 2 1 erg atom c 0 5447 10 2 erg atom 1 d 0 05447x 10 12 erg atom 1

gas absorbs photon of wavelength 345 nm and emits two wavelengths If one of the emission is at 680nm the other at A 1035nm B 325nm C700nm D 518nm A

What is the potential of an electrode which originally contained 0 1 M NO and 0 4 MH and which has been treated by 60 of the cadmium necessary to reduce all the NO to NO g at 1 atm AAJ KA TOPPER Given NO 4H 3 NO 2H O E 0 95V and log2 0 3010 1 0 52 V 3 0 86 V 2 0 44 V What is the major product of the reaction 4 0 78 V

d obeyance of Raoult s law Among the following mixtures dipole dipole as the major interaction is present in a benzene and ethanol b KCl and water acetonitrile and acetone d benzene and CC14

The alkali metals form salt like hydrides by the direct synthesis at elevated temperature The thermal stability of these hydrides decreases in which of the following orders LiH NaH KH RbH CsH CsH RbH KH NaH LiH KH NaH LiH CsH RbH NaH LiH KH RbH CsH

a 4 b 3 c 2 139 6x10 mole K Cr O reacts completely with 9x 10 3 mole X to give XO3 and value of n is Doubt a 1 b 2 c 3 d None of these 140 What weight of H C 04 2H 0 mol wt 126 should be dissolved in water to prepare 250 ngent

2 5 g acetic acid CH3COOH is dissolved in 75 g of benzene Calculate the molality of this solution A 0 555 m B 0 666 m 0 444 m D 0 777 m of

49 Which of the following is most polar a b c non utemara d

9 How many litre of oxygen at STP is required to bum 60 g C H 1 22 4 L 2 11 2 L 3 22 4x7 L 4 8 5 L D For the formation of 3 65 g of HCI gas what volume

Which among the following plots are linear a x is the concentration of reactant remaining after time t 1 a x vs t for a first order reaction 2 a x vs t for a zero order reaction 3 a x vs t for a second order reaction 4 1 a x vs t for a second order reaction a 1 and 2 c 2 and 3 e 1 and 4 b 1 and 3 d 2 and 4 Kerala PMT 2008

1 6 1 6 147 What is the molar solubility of Mn OH 2 Ksp 4 5 x 10 14 in a buffer solution containing and NH3 K 1 8 x 10 5 b 1 38 x 10 4 equal amounts of NH a 3 0 10 4 c 1 38 10 148 Find moles of NH4Cl required to prevent Mg OH from precipitating in d 7 3 10 4

or which reaction s given fact s is are correct H S H O H O HS Kc is ionization constant of acid H O H O H O OH Kc is ionic product of water 1 CH NH H O CH NH3 OH Kc is ionization constant of base 2 O Cu 4NH Cu NH3 2 Kc is stability constant of complex 2 4