Physical Chemistry Questions

C3H8 5 020 When this reaction is considered for thermodynamic studies what is the partial pressure of oxygen gas in the standard mixture state a 0 2500 atm b 0 304 atm c 1 000 atm d 7 000 atm correct answer

During a polytropic process 10lbs of an ideal gas whose R 40 ft lb lb R and Cp 0 25 BTU lb R changes state from 20psia and 40 F to 120psia and 340 F Determine I b AU C AS d Q e f Pdv Vdp

on energy of Het is 19 6 x 10 18 J per atom 45 af Het then the energy of Be ion in the second stationary state is 19 610 18 J per atom IUPAC Naming Atomic Structure Periodic a fer en 1 4 9 x 10 18 J 2 44 1 x 10 18 3 11 025 x 10 18 J 4 None of these 1 4 9 x 10 18 J 2 44 1 x 10 18 3 11 025 x 10 18 J 4 E

10 ampere current is passed through CuSO4 solution for 193 minute at 1 bar pressure and 300 K temperature If cell has 80 capacity then find out weight of Cu and volume of 0 Cu 65 3 u R 0 08314

0 76 CsBr possesses bec structure The edge length ms of the unit cell is 400 pm Find out the interionic distance 1 346 4 pm 2 200 pm

62 The following sequence of reactions may be 66 A sam used to extract zinc from its sulphide 10 the many Atomic weight of Zn 65 S 321 1 52 2ZnS 30 2ZnO 250 3 5 ZnO C Zn CO 30 mi 90 mL How many tons of Zn can be obtained from 32 33 tons of ZnS assuming that the yield is 75 for each reaction 1 5 3 12 2 2 100 4 16 4 67 produ formu 1 C 68 The S 31

We may now formulate another postulate n an isolated system there is always a endency for the systems energy to become nore disordered or chaotic and this could be criterion for spontaneous change

4 temperature pressure and catalyst 83 AH of water is 285 5 kJ mol if enthalpy of neutralisation of monoacidic strong base is 57 3 kJ mol AH of OH ion will be 84 1 228 2 kJ mol 3 114 5 kJ mol Which of the following compound has the 2 228 5 kJ mol 4 114 5 kJ mol

1 mole of an ideal gas y 1 5 taken through a series of processes as shown in following in P V curve Adiabatic C WAR 600 cal AB D WBC 300 In2 cal D B Isothermal C Information I The temperature at state A is 300 K Information II The reversible isothermal expansion form B to C doubles the volume Information III The entropy change of the system from C to D is 4 n16 cal K Select the correct option s using the above information A The entropy change of the system from D to A is 3R In8 B The temperature at point D is 2400 K

4 Low pressure and low temperature 56 In the equilibrium reaction AgCl s 2NH aq Ag NH3 aq Cl aq Onnu Salt Increase in the concentration of Cl aq causes 1 AgCl s to decompose Agci s to precipitate 3 Ag NH aq to form 4 The NH aq concentration to decrease 4 56 3 fay AgCl s 2NH aq Ag NH aq C CH aq 1 AgCl s fra 2 AC s 3 Ag NH aq fact 4 NH aq 21 B

3 6 34 x 10 4 1 49 10 51 Pick out the correct order of magnetic moment among the following 1 Na Cr2 Co Fe 2 Na Co2 Fe Cr2 3 Nat Co Cr Fe 4 Na Fe Cr2 Co tround 67

16 An open vessel at 27 C is heated until two fifth of the air assumed as an ideal gas in it has escaped from the vessel Assuming that the volume of the vessel remains constant the temperature at which the vessel has been heated is a 750 K c 750 C b 500 K d 500 C

113 Given E O 2 1 51 V 1 36 V Cr Cr 0 74 V EMnO4 Mn Cr 0 7 Cr3 1 33 V ECI CI Based on the data given above the strongest oxidising agent will be a Mn 2 c CI b MnO4 3 d Cr

If m and e are the mass and charge of the revolving electron in the orbit of radius r for hydrogen atom the total energy of the revolving electron will be Online 2014 SET 3 a c me r 1 e r b d e r 1 e

30 min Time A 10 w w solution of cane sugar has undergone partial inversion according to the reacti Sucrose water glucose fructose The boiling point of the solution is 100 7 C What fraction of sugar has inverted K H O 1 8 K kg mol

benzene 50 At 200 C hydrogen molecule have velocity torr in 2 4 x 105 cm s The de Broglie wavelength in this case is approximately a vapour 1 1 2 1000 A

RATION 8 6 Based on solute solvent interactions arrange owing in order of increasing solubility in n octane and its reason ohexane KC1 CH OH CH3CN We know that like dissolves like n octane is a ar medium hence non polar compounds will be more in it KCI CH OH CH3CN Cyclohexane Increasing solubility Conditions of Henry s Law a The pressure should not be very high b The temperature should not be too low BILITY OF GASES c Solubility of the gas in the solvent should not be very high d The gas should not chemically combine with the solvent or dissociate in the solvent A ability of a gas in any solvent is increased as the pres as over solvent increases By contrast the pressure has ble effect on the solutions of solids and liquids The ive aspect of solubility of a gas with pressure has been erms of Henry s Law s Law unt of gas dissolved w per unit volume of solvent is proportional to its pressure PA i e PA Inference It is obvious from Eq mp or m kup that higher the value of K at a given pressure the lower is the solubility of the gas in the liquid It can be seen from the table that the K value for both N and O increase with temperature indicating that the solubility of gases decreases with increase of tem perature It is due to this reason that aquatic species are more comfortable in cold water rather than in warm water Slope k atm Application of Henry s Law a In the production of carbonated beverages Why cold drink water bottles are sealed under high pressure According to Henry s law solubility of gas increases with increase in pressure of the solution that is why cold drink bottles are sealed under high pressure so that more CO can be dissolved in it b In the deep sea diving For those people who do deep sea diving nitrogen and oxygen get dissolved in their blood under the effect of pressure of water This dissolved oxygen gets utilized in the metabolic activities but nitrogen remains as such When a person comes out of the sea this nitrogen which was dissolved in blood comes out in the form of

Sodium and oxygen combine to form two c ompounds one being Na20 The amount of sodium in the other compound is 59 by we ight Find the formula of this compound

c 100 106 Of the following transitions in hydrogen atom the one which gives an absorption line of lowest frequency is b n 3 ton 8 a n 1 to n 2 d n 8 to n 3 c n 2 to n 1 ording to Bohr s model of the hydrogen atom the haracterised by the principa

3 3 5 3 6 4 5 6 5 5 Which of the following represents the unit of vanderwaal constant a 1 L mol 1 3 L atm mol 2 atm L mol 2 4 L atm mol 2 79 Under identical conditions solvolysis of which 78

Calculate the normality of a solution containing 10 5 g of NaHCO3 in 500ml water Molecular weight of NaHCO3 is 84g Write the balanced chemical equation for the reaction between copper sulphate and potassium iodide

Which one of the following conditions will favour maximum formation of the product in the reaction A2 g B2 g X g AH X kJ 1 Low temperature and high pressure 2 Low temperature and low pressure 3 High temperature and high pressure onl De fon 4 High temperature and low pressure

What is the ratio of the time period of revolution of electron He ion sample in the orbit where the path length is three time the de broglies wavelength to the time period of revolution in the ground state 1 27 1 2 1 27 3 9 8 4 8 9

1120 Average weight 11 2 100 Average atomic weight of an element M is 51 7 If two isotopes of M are 50M and 52M them calculate the percentage of occurrence of 50M in nature 50M X 52M X 100 x 100 x average atomic weight W X1 W X2 LI 51 7 50xx 52xx

The incorrect information s is are a The conductivity of a soap solution decreases sharply at CMC b Tyndall effect is more effective in gold sol in comparison to the rubber sol c The elevation in boiling point of an alcoholic solution of sulphur is less than that of its sol in water if mass of sulphur present per unit volume of mixture is same in both cases d CMC value of CH CH NH Cl will be less than that of CH CH 6 COONa

3 0 78 V 4 0 34 V 3 A graph was plotted between molar conductivity of various electrolytes NaCl HCI and NH OH and C in mol L Correct setting Molar conductivity C III 1 I NaCl II HCL III NH OH 2 I HCI II NaCl III NH OH 3 I NN OH II NaCl III HCI 4 I NH OH II HCL III NaCl 87 88

59 The enthalpy changes at 298 K in successive breaking of O H bonds of water are H O H g OH g A H 498 kJ mol OH g H g O g AH 428 kJmol the bond enthalpy of O H bond is 1 498 kJ mol 2 428 kJ mol 3 70 kJ mol 4 463 kJ mol e

In first order reaction A D the ratio of a a x was found to be 8 after 60 minutes If the concentration is 0 1M then the rate of reaction in moles of A reacted per minute is 2 226 10 3 mol liter 1 min 1 3 466x10 3 mol liter 1 min 1 4 455x10 3 mol liter min 1 5 532x10 3 mol liter 1 min

70 Given EAg Ag 0 80V EMg Mg 2 37V 0 34V EHg Hg ZENGER Cu Cu statement is correct 0 79V Which of the following 1 AgNO can be stored in copper Vessel 2 Mg NO3 can not be stored in copper vessel 0804 2 3 CuCl can be stored in copper vessel 4 HgCl can be stored in copper vessel 70 nc E Mg Mg 237V Ag Ag 0 34V Eg Hg 0 79V FAM D E TY 1 E Cu Cu 464 20 3 1 AgNO face 2 Mg NO face 0 80V E Sex Cuci Cuci a factors and forest in an interna 3 CuCl 4 HgCl faccia 2 Handy 1 X

Number of spectral lines of Balmer series obtained when electrons are de excited from th shell to ground state in sample of H atoms is 1 n 1 3 n 3 2 n 2 4 n 4

Potassium sorbate C6H KO is an additive used to prevent molding of cheese Its conjugate acid monoprotic has Ka 1 74x10 5 Find the pH of an aqueous solution containing 2 55 g of potassium sorbate in 500 0 mL Select one a 10 65 b 8 65 c 3 11 X d 4 76 e 2 55

The emission spectra of atoms in the gaseous phase do not show a continuous spread of wavelength from red to violet rather they emit light only at specific wavelengths wit dark spaces between them Such spectra is are called Silla Choose only 1 answer B C line spectra atomic spectra both A and B

2 Potassium dichromate is used to titrate a sample containing an unknown percentage of iron The sample is dissolved in H PO H SO mixture to reduce all of the iron to Fe ions The solution is then titrated with 0 01625 M K Cr O producing Fe and Cr ions in acidic solution The titration requires 32 26 mL of K Cr O for the 1 2765 g of the sample a Balance the net ionic equation using the half reaction method b Determine the percent iron in the sample

In a cubic crystal A present in non planer void with coordination number 6 if the radius of At is 100 pm then find the radius of anion in pm 1136 pm 2 645 pm 3 444 pm 4 None of these

71 72 3 35 4 45 The ratio of anion radius to cation radius of a crystal is 10 9 3 Then the coordination number of the cation in the crystal is 1 2 2 4 3 6 4 8 Which lot gorract

S 12 6 4 None 4 None 55 The EMF of the cell Cr Cr 0 1 M Fe 2 0 01 M F 55 f 12 Given E 3 cr 0 75 V Efe Fe 0 45 V 2 Cr3 Cr 1 0 26 V 2 0 52 V 3 0 72 V 4 0 60 V Be show diagonal rola 754 45 36 he ALI M log x 4x102 MAIL 76 Cr Cr 0 1 M Fe 0 01 M Fe fydd Q Fe Fea EC Fe 2 Fe 0 45 V 0 75 V C Te Feed N Fe ost by LI fl 1 0 26 V 2 0 52 V 3 0 72 V 4 0 60 V 3 Cr 4 Fe G 30 10

What is the molarity of a NaOH solution if 15 5 mL of a 0 220 M H SO4 solution is required to neutralize a 25 0 mL sample of NaOH solution Select one a 0 710 b 0 355 c 0 273 d 42 6 e 0 136 X

8 When a certain process is carried out at in a sealed rigid container the heat flow is 50 6 joules When the same process is carried out at a constant pressure of 1 25 atm the heat flow is 72 2 joules What is the value of AH at constant volume process a 21 6 J b 72 2 J c 72 2 J d 21 6 J correct answer

Which of the following salts is responsible for temporary hardness of water CaCl2 Ca NO3 2 Ca HCO3 2

C Complete the sentences by choosing the correct abstract noun from the box difference respect belief freedom 1 2 3 childhood patience 4 5 6 hunger wisdom Children must be allowed to enjoy their must be valued Rakesh believes that he will be an astronaut one day It is this in himself that will help him succeed for Ms Brown I have great When I am hungry I get very irritable I cannot bear Our elders are wise because of their experience We must respect their 7 Do not be impatient always pays in the end 8 Weather and climate are two different things Let us understand the between them Fountable and Uncountable Nouns

Given the reaction between 2 gases represented by A2 and B to give the compound AB g A2 g B2 g 2AB g At equilibrium the concentration of A 3 0 x 10 M of B 4 2 x 10 M 2 of AB 2 8 10 M If the reaction takes place in a sealed vessel at 527 C then the value of Kc will be 2 4 5 4 1 9 1 0 62 3 2 0

CAREER INS 81 The correct set of four quantum numbers for the last elec 81 37 tron of Rubidium atom Z 37 is 1 5 2 5 3 5 4 4 0 1 1 1 0 0 1 1 S 1 2 1 2 1 2 1 2 n 1 5 2 5 3 5 4 4 1 0 1 1 E o o 0 1 S 1 2 1 2 1 2

1 The time period of revolution in the third orbit of Li ion is x second The time period of revolution in the second orbit of He ion should be 8 4 XS 27 An element of atomic weight Z consists of two 1 xs XS 3

31 One mole of one of the sodium salts listed below having carbon content close to 14 3 produces 1 mole of carbon dioxide upon heating atomic mass Na 23 H 1 C 12 0 16 The salt is a C H COONa b NaHCO3 c HCOONa d CH COONa

4 I NH OH II HCL III NaCl 4 The specific conductance of a saturated solution of silver bromide is k Scm The limiting ionic conductiveity of Ag and Br ions are x and y respectively The solubility of silver bromide in gL is molar mass of AgBr 188 1 3 xx1000 x y x1000x188 x y 2 K x y 188 x y 1000 K 188 tr

1987 8 7 0 A bulb emits light of wavelength nm The bulb is rated as 200 W and 14 of the energy is emitted as light How many photons are emitted by the bulb per second 1 1 2 x 1021 3 1 33 x 10 1 2 4 x 10 0 4 4 x 1019

to combine is If all the oxygen atoms from a mixture of 2 moles H P O 54 gms H O and 98 gms H SO4 are taken and converted into Ozone the the number of moles of Ozone gas formed will be

Identify the incorrect statement Both LiCl and MgCl2 are soluble in ethanol Li is the strongest reducing agent among all the alkali metals LiCl crystallises as LICI H O Lithium nitrate when heated gives lithium oxide

A Column I Element B Compound C Mixture D H O E Fe s S s in powdered form P Q R S T U Column II Can t be decomposed into simpler substances by physical methods Can be decomposed into simpler substances by chemical methods Can t be decomposed into simpler substances by chemical methods Uniform composition Consists of one type of atoms Consists of 2 or more type of atoms

Each of the three metals X Y and Z were put in turn into aqueous solution of the other two X Salt of Y or Z Y or Z Salt of X Which observation is probably Incorrect 0 A B Y Salt of X No action observed Your Answer Y Salt of Z Z Salt of Y CZ Salt of X X Salt of Z Correct Answer Z Salt of Y No action observed