Physical Chemistry Questions

is negligible The graph of compressibility factor Z vs P for one mole of a real gas is shown in follow diagram The graph is plotted at constant temperature 273 K If the slope of graph at very atm then calculate volume of one mole of real gas molecules dz pressure dp 2 8 in L mol Given N 6x 1023 and R 3 Steth 22 4 273 Z L atm K mol 1 ITVAMITATE 28 atm 100 I TRAMATAN dP 13 2 TRIMITATE S THAMATAN Under the identical conditions of temperature the density of a gas X is two times to that of p Y while molecular mass of gas Y is three times that of Y Calaul

27 HCl was passed through a solution of CaCl2 MgCI and NaCl Which of the following compound s crystallise s Both MgCl and CaCl Only NaCl Only MgCl NaCl MgCl and CaCl 28 Anisole on cleavage with HI gives 1 2 3 4 OH

show hamiltonian operator for the plane waves exponential imaginary Prove that this operator does not change this function Prove that this operator does generate energy of a particle in free space

Consider the reaction 2CrO H O 2KOH K Cr 012 2H O Potassium peroxy chromate K O Cr 0 0 Cr OK 0 0 Pick INCORRECT statements 1 Oxidation number of Cr changes in the reaction 2 Cr is hexavalent in both reactant and product side 3 Covalency of Cr changes in the reaction 4 Total number of peroxy linkages on reactant and product side is same in the balanced reac 1 2 both O2 3 both O 1 3 both 1 2 3 4 all

The decomposition reaction 2N O g 2N O g O g is started in a closed cylinder under 10 s the pressure inside the assuming ideal gas isothermal isochoric condition at an initial pressure of 1 atm After Y cylinder is found to be 1 45 atm If the rate constant of the reaction is 5 10 behaviour the value of Y is

3 31 pm then minimum uncertainty in kinetic energy is yx10 16 J Calculate the value of y TI 13 In a sample of excited hydrogen atoms electrons make transition from n 2 to n 1 Emitted quanta strike on a metal of work function 4 2eV Calculate the wavelength in associated with ejected electrons having maximum kinetic energy 14 For 1s orbital of Hydrogen atom radial wave function is given as 3 2 R r e r ao where a 0 529 1 1 ao The ratio of radial probability density of finding electron at r a to the radial probability density of finding electron at the nucleus is given as x e Calculate the value of x y 15 Calculate the value of A A E1 2 2E21 Sjeve I where Enz Energy of electron in nth orbit Z atomic number of hydrogen like

pair both the species b NF3 H O d H S BF3 Karnataka NEET 2013 29 which of the following ionization processes 28 An which of the following have sp hybridization a SiF4 BeH c NF3 BF3

121 In set of reaction ethyl benzene yielded a product D CH CH D would be 1 2 3 COOCH Br Br KMnO B KOH CH CH COOCH Br Br CH COOCH COOH Brz C C H OH D Feds

7 Calculate the number of waves made by a Bohr electron in one complete revolution in nth orbit of He ion if ratio of de Broglie wavelength associated with electron moving in n and 2 brbit is 2 0

104 A two dimensional solid is made by alternating circles with radius a and b such that the sides of the circles touch The packing fraction is defined as the ratio of the area under the circles to the area under the rectangle with sides of length x and y X y 2a bi x 2a 2b The ratio r b a for which the packing fraction is minimized is closest to A 0 41 B 1 0 C 0 50 D 0 32

500 ml of each three sample of H O2 labelled 10 V 15V and 20 V are mixed and then diluted with equal volume of water The volume strength of resultant H O2 solution is Considering 1 mole of gas at STP 22 7 L

A 20 L container at high temperature contains CO at pressure 0 4 atm and an excess of CaO s The volume of the container is now decreased by moving the movable piston fitted in the container The maximum value of volume of the container when pressure of CO attains its maximum value is found to be 4 L Kp of following equilibrium is CaCO3 s CaO s CO g A B C D 5 atm 10 atm 4 atm 2 atm

0 1 mole H3POx is completely neutralised by 5 6 g KOH then the true statement is O x 3 and given acid is dibasic O x 4 and given acid has no P H linkage O x 2 and given acid has two P H linkage All of these

For the reaction calculate how many grams of the product form when 24 4 of Sr completely reacts Assume that there is more than enough of the other reactant 267 AEO 2Sr s O g 2SrO s

Avogadro number is 1 Number of atoms in one gram of the element 2 Number of mililitre which one mole of a gaseous substance occupies at NTP 1 atm 0 3 Number of molecules present in one gram molecular mass of a substance 4 All are correct

Imagine a alternate existing universe in which the set of 4 quantum numbers exist in given values n 1 to infinity 0 to n 1 m l 1 to l 1 including zero S 1 2 0 1 2 On the basis of given data in which periodic table s block copper will belong and what would be its electronic config uration in ground stato 2

Suppose you are given two oleum samples Sample A contains equimolar mixture of its components while sample B contains equimass mixture of its components Which of the two samples will have greater strength Sample A Sample B Both have same strength Nothing can be predicted until numerical data is given

A tetravalent element forms monoxide and dioxide with oxygen When air is passed over heated element 1273 K producer gas is obtained Monoxide of the element is a powerful reducing agent and reduces ferric oxide to iron Identify the element and write formulas of its monoxide and dioxide Write chemical equations for the formation of producer gas and reduction of ferric oxide with the monoxide

47 Scientist of UK have invented the cars working on hydrogen fuel cells instead of petrol engines Here hydrogen is used as a sources of electrical energy i e a reaction of hydrogen an oxygen is used to generate electrical energy It has many advantages over the conventional fossil fuels and electric power generation i Give two advantages of hydrogen over fossil fuels ii What is the efficiency of fuel cell as comparison to other conventional fuels iii What are the values possessed by scientists of UK

Semiconduction non stoichiometric nickel II oxide can be prepared by the reaction of stoichiometric compound with oxygen gas What volume of oxygen gas at 25 C and 2 5 atm would be consumed in converting 1 0 kg of NiO to the appropriate amount of Ni0 9701 00 What mass of semiconductor would be produced

Excess F g reacts at 150 C and 1 0 atm pressure with Br g to give a compound BrF If 423 mL of Br g at the same temperature and pressure produced 4 2 g of BrF what is n Atomic mass Br 80 F 19

inflated to a immersed to the bottom of a lake its volume reduce to 1 25 L Assuming atmospheric pressure to be equivalent to 10 m column of water and no change in temperature if the depth of the lake is x x 10 cm what is the value of x A gaseous mixture containing equal moles of H 0 and He is subjected to series of effusion steps The composition by moles of effused mixture after 4 effusion steps is x 1 y X respectively Then find the value of One mole of a gas changed from its initial state 15L 2 atm to final state 4L 10 atm eversibly If this change can be represented by a straight line in P V curve maximum emperature approximate the gas attained is xx 102K Then find the value of x Two moles of an ideal gas undergoes the following process Given that OP is x x 10 then Tv

4 9 Molar conductivity of a solution of an electrolyte AB is 150 59 AB facen at sige nachal on s cm mol If it ionises as AB A 3B its equivalent cm mol AB A conductivity will be arguratat at grain 1 150 in Scm eq 2 75 in Scm eq 3 50 in Scm eq 4 80 in Scm eq 1 150 in Scm eq 2 75 in Scm eq 3 50 In Scm eq 4 80 In Scm eq

Glucose form 3 different solution with water Solution A 10 w w Solution B 10 ppm Solution C 10 ppb Select correct option A Max mass of glucose present in solution A B Max mass of glucose present in solution B C Max mass of glucose present in solution C D Same mass of glucose in solution A B and C

95 The following facts are available 2A B 2B A 2C B No reaction 2D A 2A D Which of the following statements is correct 1 EC IC EB 1B E10 2 EC IC EB 1B EA 1A E 1D 3 EC IC E B EA 1A E 10 FO FO 4 F EO A A FO 50

Question 2 A 5 0 cm solution of H O liberates 0 508 g of I from an acidified KI solution The strength of H O solution in terms of volume strength at STP is Options a 2 24 vol b 8 96 vol c 1 12 vol d 4 48 vol

5 A co ordination complex of cobalt has molecular formula 65 containing five ammonia molecules one nitro group and two chlorine atoms for one cobalt atom One mole of this compound produces three mole ions in an aqueous solution In reacting this solution with excess of silver nitrate solution two moles of AgCl get precipitated The ionic formula of this complex would be 1 Co NH3 4 NO C NH3 C 2 CO NH3 CI CI NO 3 CO NH3 NO Cl 4 ICO NH 1 NO C Te face n en casa fac fuffrage fant AgCl se 1 Co NH3 NO C NH 2 CO NH3 a C NO 3 CO NH3 NO 4 CO NH3 NO

a Examine the given defective crystal X Y X Y X Y X Y X Y X Y X e X Y X Y X Y Answer the following questions i Is the above defect stoichiometric or non stoichiometric ii Write the term used for the electron occupied site iii Give an example of the compound which shows this type of defect

Q2 Aqueous A reacts to form R AR and in first minute in batch reactor its concentration drops from CAO 2 5 mol liter to CA 2 0 mol liter Find the rate equation for the reaction if kinetics is second order with respect to A Also find the conversion after 6 minutes 24

9 Total vapour pressure of mixture of 1 mole of volatile component 69 a 2 P 100 mm Hg 3 A P 100 mm Hg and 3 mole of volatile component B iB p 80 mm Hg f P 80 mm Hg is 90 mm Hg For such case 90 mm Hg 1 fra fog 1 There is positive deviation from Raoult s law 1 2 Boiling point has been lowered 2 3 Force of attraction between A and B is smaller than 3 AB that between A and A or between B and B 4 All the above statements are correct 4 faca

Plot of log x m against log p is a straight line inclined at an angle of 45 When the pressure is 0 5 atm and Freundlich parameter k is 10 the amount of solute adsorbed per gram of adsorbent will be log 5 0 6990 Kerala PET 2008 lg 28 30

Am of 0 01 M MgCl2 is 220 S cm mol 1 A of MgCl is 240 S cm mol 1 A of Mg2 is 100 S cm mol 1 All above measurements are done in a conductivity cell Assuming MgCl2 to be a strong electrolyte which of the following is are incorrect Limiting equivalent conductivity of MgCl is 480 S cm eq 1 Am of MgCl2 varies linearly with its concentration Am of 0 04 M MgCl2 will be 160 S cm mol 1 Am of 0 04 M MgCl2 will be 200 S cm mol 1

An ammonia ammonium chloride buffer has a pH value of 9 with NH3 0 25M What will be the new pH if 500 ml 0 1 M KOH is added to 200 ml buffer solution K 2 105 log2 0 3 A 8 4 B 9 6 C 5 6 D 4 4

Given below are two statements Statement I The E value of Ce4 Ce3 is 1 74 V Statement II Ce is more stable in Ce4 state than Ce state In the light of the above statements choose the most appropriate answer from the options given below 1 Both statement I and statement II are correct 2 Statement I is incorrect but statement II is correct 3 Both statement I and statement II are incorrect 4 Statement I is correct but statement II is

Explain the following i Gallium has higher ionization enthalpy than aluminium ii Boron does not exist as B ion iii Aluminium forms AlF ion but boron does not form BF ion

4 An aqueous solution of AgNO js electrolysed using direct current The electrodes are inert and time dependence of current is represented as Ag N 03 1 0 J Current 1 amp 4 2 5 10 15 Time sec The mass in mg of Ag 108 g mol deposited at

The decomposition of formic acid on gold surface follows first order kinetics If the rate constant at 300 K is 1 0 x 10 3 s 1 and the activation energy E 11 488 kJ mol the rate constant at 200 K is x 10 5 s Round a of to the Nearest Integer Given R 8 314 J mol K Official Ans by NTA 10

en B and B 4 All the above statements are correct 4 70 If the concentration of Cro ion in a saturated solution 70 fe faca of silver chromate is 2 x 10 M Find solubility product of silver chromate 1 4 x 10 8 2 8 x 10 12 3 32 x 10 12 4 6 x 10 12 When white phosphorus faca Croa 2 10 Mat fan it factual 1 4 x 10 8 2 8 x 10 12 3 32 x 10 12 4 6 x 10 12

Industrial process a Haber s process b Ostwald s process Application i HNO3 synthesis ii Aluminium extraction c Contact process iii NH3 synthesis d Hall Heroult process iv H SO4 synthesis Choose the correct answer from the options given below 1 a ii b iii c iv d i 2 a iii b iv c i d ii 3 a iii b i c iv d ii

Isomerization of cyclobutene into 1 3 butadine follow first order kinetics as g g The kinetic study was performed by taking same amounts of cyclobutene in three sealed flasks First k was broken after 20 minute and the reaction mixture was absorbed completely in bromine solution 0 mL 1 0 M bromine solution was required The second flask was broken after a very long time and reaction mixture required 20 mL bromine solution of the same strength If the third flask was broken r 30 minute what volume of bromine solution of same strength would have been required

Kerala PMT 2002 Isothermic nature Solute solute interaction Solute solvent interaction Density of the liquid Incorrect Correct

79 Q 18 A salt X is heated to become its dehydrated form Y and this Y after mixing with water becomes X that can be used for white washing of walls and this solution dries very quickly and become hard mass Y The substance X and Y respectively is Full Marks 1 a Calcium oxide and calcium hydroxide b Calcium carbonate and calcium oxide c POP and gypsum d Gypsum and POP

NH 5 6 NaNO HCI X 273 278 K 1 X 2 X In the above chemical reaction intermediate X and reagent condition A are 3 X 4 X N CI NO A NO N CI Major Product A H O NaOH A H O A OH A H O A A H O NaOH

Freundlich isotherm is obeyed The slope of the plot is zero Then the extent of adsorption is Kerala PMT 2012 Directly proportional to the pressure of the gas Inversely proportional to the pressure of the gas Directly proportional to the square root of the pressure of the gas Inversely proportional to the square root of the pressure of the gas Independent of the pressure of the gas

8 Calculate the molality of an aqueous solution that has a boiling points elevation of 1 00 K For water K 0 512 K mol kg 9 When 36 0 g of a non volatile solute having the empirical formula CH O is dissolved in 1 20 kg of What is molecular formula of the compound

1 mole of anhydrous X is added in 1 Kg water volume is finally 1 litre To this mixture small amount of Y is added such that it acts as Limiting reagent In each case Y reacts to give water soluble products Identify the correct option s List I X Y P KCN AgCN s 1 CUS Q Conc HNO3 S R Hgl2 Kl s CH3COOH Ba OH 2 s List II Effect of addition of Y on X water mixture Freezing point decreases Osmotic pressure 2 does not increases Freezing point 3 does not increases Vapour pressure decreases

When light of wavelength 248 nm falls on a metal of threshold energy 3 0 eV the de Broglie wavelength of emitted electrons is Round off to the Nearest Integer Use 3 1 73 h 6 63 x 10 34 Js m 9 1 x 10 31 kg c 3 0 108 ms me 1eV 1 6 10 1 J

81 Q 20 The oxidation different from combustion of ethanol because Full Marks a Oxidation requires 1 O atom but combustion requires 1 molecule of O b Oxidation gives acid but alcohol give CO2 and H2O c Heat is liberated in combustion but heat is supplied in oxidation d All of the above

Given below are two statement one is labelled as Assertion A and the other is labelled as Reason R Assertion A Size of Bk ion is less than Np ion Reason R The above is a consequence of the lanthanoid contraction In the light of the above statements choose the correct answer from the options given below 1 A is false but R is true 2 Both A and R are true but R is not the correct explanation of A 3 Both A and R are true and R is the correct explanation of A 4 A is true but R is false

Let CNaCl and CBaso be the conductancesongo mathongo in S measured for saturated aqueous solutions of NaCl and BaSO4 respectively at a temperature T Which of the following is false mnothonge A CBaSO4 T BaSO4 T for T T B CNaCl T CNaCl T1 for T T C CNaCl CBaSO4 at a given T D lonic mobilities of ions from both salts increase with T