Physical Chemistry Questions

A 54 35 pm In diamond carbon atom occupy FCC lattice points as well as alternate tetrahedral voids If edge length of the unit cell is 356 pm then radius of carbon atom is A 77 07 pm B 154 14 pm C 251 7 pm D 89 pm

Which of the following cations posses neither noble gas nor pseu i Bi ii Pb iii Sn 1 ii iii 2 i iv 3 i ii iii U 18 ations iv Tl 4 i ii iii iv

Among the complex ions Cr CO 6 Fe CO 5 PtCl Br CO NH3 3 NO3 3 Fe H O 4 OH 2 Fe NH3 2 CN 4 Co NH CH CH2 NH2 2 NH3 CI 2 and Co NH3 4 H O CI 2 the number of complex ion s that show s cis trans isomerism is Answer 00 01 02 03 04 05 06 07 08 00 01 02 03 04 05 06 07 8 9

7 Total number of compounds that can be taken as a reagent in the titration of boric acid with NaOH is nic acid w HIS RAYANA GROU Ethylene glycol glycerol transcyclopentan 1 2 diol salicyclic acid glucose mannitol cis cyclohexane 1 2 diol

product if concentration of X is increased to three times then rate increases by a factor of 3 and when the concentrations of both the reactants X and Y are tripled then rate increases by a factor of 9 The rate law for the reaction can be written as In a reaction X Y Rate K X Y Rate K X Y Rate K X Y Rate K X Y 3

When Eext 1 1 volt is applied in Daniel cell having electrodes of zinc and copper dipping in one molar solutions of their respective salts then O Electrons flow from Cu to Zn O Electrons flow from Zn to Cu O Zn dissolves at anode and Cu deposits at cathode O No flow of electrons or current

I will be taking an question to help you know what is my d oubt Let the example be A electron makes transition from 7th energy state to 2nd s tate Find number of spectral lines visible in Balmer series So here if I apply the formula An An 1 2 where An n 2 n1 then I am getting wrong answer So is there any diffe rent formula

als i All orbitals of the same shell in the absence of magnetic field possess same energy i e they are degenerate ii All orbitals of the same subshell differ in the direction of their space orientation 2 iii Total number of orbitals in a main energy shell is equal to n but not more than 16 in any of the main shells of the known elements n 1 No of orbitals 1 1 1s n 2 No of orbitals 2 2 4 2s 2 px 2py 2pz No of orbitals 3 9 3s 3 px 3 py 3 pz 3dxy 3d 3d a n 3 3d

The ionisation constant of an acid K is the measure of strength of an acid The K values of acetic acid hypochlorous acid and formic acid 1 74 x 10 3 0 x 10 and 1 8 x 10 respectively Which of the following orders of pH of 0 1 mol dm solutions of these acids is correct are i acetic acid hypochlorous acid formic acid hypochlorous acid acetic acid formic acid

ALLEN 88 For one mole of vanderwal s gas when b 0 and 88 1 V T 300K the PV vs The value of vanderwaal constant a is 1 1 0 2 4 5 3 1 5 PV 24 6 21 6 20 1 plot is shown below 2 0 3 0 che 1 V fraic 25 1 1 2 4 3 1

1 mol of FeC O4 is oxidised by x mol of Cr O in acidic medium then x is 1 3 2 1 5 3 0 5 4 1 0 82

Consider the following sparingly soluble salts having same solubility product in their saturated solution in water a XY b X Y C XY3 The correct order of increasing solubility of these salts in water will be A A B C B C B A C B A C D B C A Your Answer B Correct Answer Description

3 253 kJ mol 4 313 kJ mol 10 ml each of IM HCI and IM H SO are 79 neutralised by IM NaOH solution that liberate the heat of x and y respectively Which is true 1 2x y 2 x y 3 x 2y 4 3x y 3 253 kJ mol IM HCI IM H SO face and artiq rufaa 1 2x y 3 x 2y 4 313 kJ mol t mol 10 ml IM NaO xay 35 2 x y 4 3x y

mm 4 At 25 C a 0 1 molal solution of CH COOH is 1 35 dissociated in an aqueous solution Calculate freezing point and osmotic pressure of the solution assuming molality and molarity to be identical 0 189 C 2 48 atm

16 Determine the value of AH and AU for the reversible isothermal evaporation of 90 0 go water at 100 C Assume that water vapour behave as an ideal gas and heat of evaporatio of water is 540 cal R 2 0 cal mol K B

3 The isomerism exhibited by the co ordination compounds Cr H O 6 Cl3 violet and Cr H O 5Cl Cl H O grayish green 1 Linkage isomerism 2 Solvate isomerism 3 Ionization isomerism 4 Co ordination isomerism

Why they say kp is independent of pressure It is directly proportional to total pressure is not it correct OVO TH 55 The equilibrium constant k for the reaction A 2B is related to degree of dissociation of A is a and total pressure P is 1 kp 2 kp P 3 kp 05 pressure 4 Kp P 4a P 1 2 kp is independent of pressure 2a P 1 pressure 4a P 1 2 1 kp is directly proportional to kp is directly proportional to P kp is directly proportional to

1 Q 53 The solubility of Co Fe CN 6 in water at 25 C from the following data Conductivity of saturated solution of Co Fe CN 6 2 06 x 106 ohm cm and that of water 4 1 x 107 ohm cm The ionic molar conductivities of Co and Fe CN are 86 and 444 ohm cm mol respectively is 2 x 10 mol

Limiting molar conductivity of CH COOH ie Am CH3COOH is equal to O Am HCB Am NaC1 Am CH COONa O Am HCB Am CH COONS Am N CI

An aquous solution containing IM NISO and IMS O is electrolysed using palladium electrode at 25 C Ni 2 Ni E 0 25V 21 2e H E 0 00V O 4H 4e 2H O E 1 23V Pd 2 Pd E 0 92V S O 2 2SO E 2V pH of solution is 7 Select the correct statement s on the basis of given information Ignore over voltage and neglect variation with cocentration A Reaction at anode is Pd Pd 2 C Reaction at cathode is Ni 2 Ni B Reaction at anode is 2H O O 4H 4e D Reaction at cathode is 2H 2 H

2 59 At 500 kilobar pressure density of diamond and graphite are 3 g cc and 2 g cc respectively at certain temperature T The value of AH AU is kJ mol kJ mol for the conversion of 1 mole of graphite to 1 mole of diamond at temperature T

Half life period of a reaction is directly proportional to the initial concentration of the reactant This statement is correct for a O First order reaction O Third order reaction O Second order reaction O Zero order reaction

Aluminium crystallises in a cubic close packed structure Its metalli radius is 125 pm i What is the length of the side of the unit cell ii How many unit cells are there in 1 00 cm of aluminium

X and Y are two volatile liquids with molar weights of 10 g mol and 40 g mol respectively Two cotton plugs one soaked in X and the other soaked in Y are simultaneously placed at the ends of a tube of length L 24 cm as shown in the figure The tube is filled with an inert gas at 1 atmosphere pressure and a temperature of 300 K Vapours of X and Y react to form a product which is first observed at a distance d cm from the plug soaked in X Take X and Y to have equal molecular diameters and assume ideal behaviour for the inert gas and the two vapours L 24 cm Cotton wool soaked in X 2 Initial formation of the product Choose the correct answer The value of d in cm shown in the figure as estimated from Graham s law is 1 8 3 16 Cotton wool soaked in Y 2 12 4 20 The experimental value of d is found to be smaller than the estimate obtained using Graham s law This is due to 1 Larger mean free path for X as compared to that of Y 2 Larger mean free path for Y as compared to that of X 3 Increased collision frequency of Y with the inert gas as compared to that of X with the inert gas 4 Increased collision frequency of Y with the

The solution prepared by dissolving 6 06 g of triphenyl methane C6H5 CH in 1000 g of benzene which has a cryoscopic constant of 5 12 Kkg mol is cooled at 0 221 C below the freezing point of pure benzene a Mass of crystallized benzene b Molality of the solution in equilibrium with the crystals

A For the reaction Fe 2 aq Ag aq Ag s Fe aq Predict which change will decrease the cell voltage 1 Increase the amount of Ag 3 Increase the concentration of Fe 3 2 Decrease the concentration of A 4 Both 2 3

assuming reactions are of order 2 52 A radioactive element has atomic mass 90 amu and a half life of 28 years The number of disintegrations per second per g of the element is X 10 2

cubic ii body centred cubic and 18 An element with molar mass 2 7 10 kg mol forms a cubic unit cel with edge length 405 pm If its density is 2 7 10 kg what is th nature of the cubic unit cell

For a cell to work spontaneously which of the following option should be correct AG 0 Ecell 0 AG 0 Ecell 0 AG 0 Ecell 0 AG 0 Ecell 0

D equal number of extra cations and electrons are present in Li forms a body centre cubic lattice if the lattice constant is 3 50 x 10 m and the experiemental density is 5 3 x 10 kg m Calculate the percentage occupancy of Li metal A 98 B 96 C 90 D 86 to have the composition Cu S because of incorporation

1 M Expermentally it was found that a metal oxide has formula Mo 980 Metal M is present as M and M 2 Jee Main offline 13 0 0 N 2 in its oxide Fraction of the metal which exists as M would be 3 1 7 01 2 4 08 3 6 05 M80 4 5 08 dius of 0 14pm crystallizes in an fcc unit cell What is the length of a side

1 3 Classify each of the following solids as ionic metallic molecular network covalent or amorphous i Tetra phosphorus decoxide PO 0 ii Ammonium phosphate NH 3PO4 iii Sic iv L v P4 vi Plastic vii Graphite viii Brass ix Rb x LiBr xi Si

and O2 2gm each Because of a sudden sparking inside the container the gases reacted with ea The vapour pressure of water at 27 C is 45mm Hg A closed container of volume 1 L is filled with other with 100 efficiency Calculate the partial pressure of gases remaining and total pressure the container finally at 27 C

A 3 33 B 4 33 K The packing fraction in the CsCl structure with anion anion contact along with anion cation contact will be CS CI TC TC A 11 3 1 B 11 3 1 1 c 2 1 D 2 1

Antimony is obtained by heating pulverized stibnite Sb S3 with scrap iron and drawing off the molten antimony from the bottom of the reaction vessel Sb S3 3Fe 2Sb 3FeS Suppose that 0 600 kg of stibnite and 0 300 kg of iron turnings are heated together to give 0 300 kg of Sb metal Calculate a The limiting reactant b Excess reactant c The degree of completion d The percent conversion e The yield

i think this faculty is incorrect plz tell me what is the cor rect answer as i have studied that it is more in H2O2 then H2O ymogen 1 Hydrogen Which of following is incorrect for order H O H O 1 Boiling point 2 Reactivity 3 Dipole moment x 4 H bond strength 13 M 11

Q 51 The decomposition of N O into N and O in presence of gaseous argon follows second order kinetics with k 5 0 x 10 L mol s e parameters are kJ mol 29000 K T Arrhenius

Q 53 The e m f of cell Zn ZnSO4 CuSO4 Cu at 25 C is 0 03 V and the temperature coefficient of e m f is 1 4 x 10 V per degree The heat of reaction for the change taking place inside the cell is kJ mol

We were taught in class that in this case rxn goes to side vith less moles l e forward so why is it not working here ols don t send previous answers give a nicer detailed expla nation At some constant equilibrium temperature T K following gaseous equilibrium is set in a vessel fitted with a movable piston N 3H 2NH Now at this equilibrium state total pressure is increased and allowed to attain a new equilibrium state Which of the following will be true at the new equilibrium state Concentration of NH3 will increase but that of N and H will remain same Concentration of NH3 N and H will increase There shall be no change in the concentration of any of these gases Concentration of NH3 will increase but that of N and H will decrease

If the freezing point of a 0 01 molal aqueous solution of a cobalt III chloride ammonia complex which behaves as a strong electrolyte is 0 0558 C the number of chloride s in the coordination sphere of the complex is Kf of water 1 86 K kg mol Answer 0 01 02 03 04 05 06 07 08 09 0 01 02 03 04 05 06 07

What is the oxidation number of titanium Ti 48 Spinel is a important class of oxides consisting of two types of metal ions with the oxide ions arranged in CCP pattern The normal spinel has one eight of the tetrahedral holes occupied by one type of metal ion and one half of the octahedral hole occupied by another type of metal ion Such a spin l is formed by Zn Al and 0 with Zn in the tetrahedral holes Give the formulae of spinel

Choose the correct statement among the following O Number of formula units of CsCl per unit cell in CsCl structure is 4 Co ordination number of fluoride ion in fluorite type structure is 4 Number of formula units of NaCl per unit cell in rock salt structure is 1 Co ordination number of chloride ion in rock salt type structure is 2

I think I have made no mistake then too why my answer is not matching with answer key Please help me 3 102 00 9 2 g of toluene C Hg is completely burnt in air The difference in heat change at constant pressure and constant volume at 27 C is 1 2 5 kJ 2 2 5 kJ 3 Zero 4 0 50 kJ For the reaction P Q 3YAH nCPAT PUENGAT AH AU NAT CP C a Load pat tznate to ex ZMATR 10 21x300x25

For most of the transition metals of first series the magnetic moment is nearly equal to spin only magnetic moment This is due to The contribution of orbital angular momentum is very high so it plays important role in measurement of magnetic moment The contribution of orbital angular momentum is effectively quenched so orbital angular momentum have no significance in magnetic moment Most of the metals or metal ions are diamagnetic in nature O Most of the metals or metal ions are coloured in nature

1 Pressure of 1 g of an ideal gas X at 27 C is 2P bar When 2 g of another ideal gas Y is introduced into the same flask at same temperature the pressure becomes 1 5 times How many times is molar mass of Y as compared to X

2 15 points Calculate the probability that an electron described by a hydrogen atomic 1s wave function will be found within a 34 ao of the nucleu 5 within 1 5 as of the nucleus and c between 3 and 4 ao of the nucleus The walue of an is 5 291 x 10 1 meters the Bohr radius

Which one of the following schemes of ordering closed packed sheets of equal sized spheres do not generate close packed lattice A ABCABC B ABACABAC ABBAABBA D ABCBCABCBC than the ideal radius of B

Q 59 Dipole moment of HX is 2 59 x 10 30 coulomb metre Bond length of HX is 1 39 bns The ionic character of molecule is

entre of Excellence Consider the decomposition of solid NH4HS in a flask containing NH3 g at a pressure of 2 atm What will be the partial pressure of NH3 g and H S g after the equilibrium has been attained Kp for the reaction is 3 A PNH3 C PNH3 4 atm PH S 2 atm 3 atm PH S 1 atm 1 732 atm PH S B PNH3 D PNH3 1 atm PH S 1 732 atm 1 atm

In a bimolecular reaction the steric factor P was experimentally determined to be 4 5 Th correct option s following among is are This question has multiple correct options A Experimentally determined value of frequency factor is higher than that predicted by Arrhenius equation B The value of frequency factor is higher than that higher than that determined experimentally C The activation energy of the reaction is unaffected by the value of steric factor D Since P 4 5 the reaction will not proceed unless an effective catalyst is used