Physical Chemistry Questions

i Chose the correct options for following match the following A p Neutrons q p orbital r charge on electron s Lyman series a p i q ii r iii s iv c p iv q i r ii s iii B i six electrons ii 1 6 10 1 C iii Ultraviolet region iv Chadwick b p ii q i r iii s iv d p iv q ii r iii s i

1 Suppose an unknown metal sulfate is found to be 41 35 SO4 Assuming the charge on the metal is 3 determine the identity of the metal and enter the chemical formula of the unknown metal sulfate below

Choose the correct statement of the following A The specific heat capacity at constant pressure for H g is 7 cal unit amount B The critical volume of a gas is three times of its excluded volume Dalton s Law of partial pressure is applicable to the mixture of H and He at all temperatures D In the diffusion process of a mixture of He and Ne the remaining gas in the container is enriched in

A sample of gas contains 0 1000 mol of HBr g and 5 000 102 mol of Cl R and occupies a volume of 7 23 L The following reaction takes place 2HBr g Cl g 2HCl g Bry Calculate the volume of the sample after the reaction takes place assuming that the temperature and the pressure remain constant

To prepare a buffer of pH 8 26 amount of NH4 2 SO4 to be added to 500 mL of 0 01 M NH4OH solution is pKa NH4 9 26 A 0 05 mole C 0 10 mole B 0 025 mole D 0 005 mole

25 V H O solution means O 25 L O g is obtained at STP from 1 mole H O aq solution O 25 L H O aq solution will provide 1 L O g at STP O 25 L O g is obtained at STP by 1 L H O aq solution O 1 mole of O g is obtained by 25 L of H O aq solution

For molar equivalent conductivity of a electrolyte A By which of the following is correct for kohlroush law Ox AG Av y Ag gr OX Am AY Y Am B 169 Av 6 Br X y Ox Am A y Am By

0 8 9 2 Paragraph for question nos Three laser guns labelled as I II and III have power 2 watt 3 watt and 5 watt Not necessary in same order are used to produce photocurrent from metal plate Number of photons emitted by laser guns are 4 x 1018 5 x 1018 and 9 x 1018 per sec Metal plate have threshold energy 4 5 x 10 19 J Neither the power nor the number of photons emitted by a particular laser gun is known and it is known that all capable photons emit a photoelectron Minimum possible wavelength of emitted photoelectron is A 680 C 480 A 08 3 30 Minimum photocurrent which must be passed through the circuit A 2 88 B 1 44 C 2 08 D None of these D 0 64 Ratio of maximum to minimum photocurrent which can be passed through the circuit A 5 4 B 9 5 C 9 4 D 9 2

3 A solution containing 2 7 10 mol of A2 ions required 1 6 10 3 mole of MnO4 for the oxidation of A to AO3 the medium use is Question Type Single Correct Type 1 2 3 4 Neutral Acidic Strong basic None of these

19 Which of the following statements is incorrect a One gram atom of carbon contains Avogadro s number of atoms b One mole of oxygen gas contains Avogadro s number of molecules c One mole of hydrogen gas contains Avogadro s number of atoms d One mole of electrons stands for 6 02 10 3 electrons

The system that forms maximum boiling azeotrope is a carbon disulphide acetone b benzene chloroform c acetone chloroform d n hexane n heptane

Incorrect statement among the following is O Number of o and bonds in ethene TT respectively are 5 and 1 O In PC15 three P Cl bond lie in one plane and make an angle of 120 with each other O In SF6 hybridization is sp d O BrF5 is trigonal bipyramidal in shape

Incorrect statement among the following is O Number of a and TT bonds in ethene respectively are 5 and 1 O In PC15 three P Cl bond lie in one plane and make an angle of 120 with each other In SF hybridization is sp d O BrF is trigonal bipyramidal in shape

Which of the term in green chemistry is used for the process where no solvent is used A Colourochemistry B Sonochemistry skipped C No solvent chemistry

55 RR0065 What would be the equivalent weight of the reductant in the reaction Fe CN H O 20H 2Fe CN 2H O 0 Given Fe 56 C 12 N 14 O 16 H 11 1 17 2 212 3 34 4 32

7 NaBr used to produce AgBr for use in photography can be self prepared as follows Fe Br FeBr i FeBr Br Fe Brg Fe Br Na CO NaBr CO FegO Mass of iron required to produce 2 06 x 10 kg NaBr A 420 g B 420 kg iii not balanced not balanced D 4 2 x 108 g 11 C 4 2 x 105 kg If the yield of ii is 60 iii reaction is 70 then mass of iron required to produce 2 06 x 103 1 kg NaBr A 105 kg B 105 g C 10 kg D none 12

A 10 cm diameter disk is placed at the center and parallel to a 25 cm diameter hemisphere Designating the sphere as surface 1 the disk as surface 2 and a large surrounding room as surface 3 calculate all the shape factors

In a mixture of A and B components show negative deviation when 1 A B interaction is stronger than A A and B B interaction 2 A B interaction is weaker than A A and B B interaction 3 AV 0 AS 0 4 AV 0 AS 0

2 The cell diagram for an electrochemical cell is written as Ni s NiCl aq Ce ClO4 4 aq Ce CIO4 3 aq Pt s Write the equations for the half cell reactions that occur at the electrodes Balanc overall cell reaction

Question No 11 Density of O gas at 127 C and 0 41 atm pressure is R 0 082 L atm K moll O 0 8 g L O 0 2 g L O O 0 4 g L 1 1 2 g L 1

t O O 20 H hiles a c 3 d 13 69 Solution of a monobasic acid has a pH 5 If one mL of it is diluted to 1 litre what will be the pH of the resulting solution a 3 45 c 8 58 b 6 96 d 10 25

For an ideal solution with PA PB which of the following is true a XA liquid XA vapour b XA liquid XA vapour c XA liquid XA vapour d XA liquid and XA vapour do not bear any relationship with each other

density of SO gas with respect to methane The density of air at STP is 0 001287 g mL Its vapour density is A 143 B 14 3 C 1 43 Hint Divide with the density of hydrogen at STP i e 0 00009 g mL D 0

3 COOH The geometry of some complex ions are given against them A 4g NH Linear B C Cu NH Square planar D Ni CN Square planar The correct match is 1 A D 2 A B C Br MnCl Tetrahedral 3 A C D 4 A B C D

J Valence Shell Electron Pair repulsion VSEPR theory is used to predict which of the following a Energy levels in an atom b The shapes of molecules and ions c The electron densities of elements d The type of bonding in compounds

1 What is the method used in the preparation of the iso alcoholic elixir 2 Compute for the alcoholic strength v v of the prepared low alcoholic elixir 3 What volume in mL of the prepared low and high alcoholic elixir with 55 v v alcoholic strength 4 Why was the low alcoholic elixir allowed to stand for 24 hours 5 Explain why turbidity occurs when an aqueous solution is added to the alcoholic solution 6 A 60 year old male patient was prescribed with an alcoholic elixir with 40 alcohol strength for his cough However he also orders aspirin for his headache What will you tell the patient OmL 1 What is the former official name of the terpin hydrate oral solution 2 What is the method used in the preparation of the terpin hydrate oral solution 3 Compute for the alcoholic strength in v v of the prepared elixir 4 Does the prepared product comply with the terpin hydrate content stated in the USP monograph 5 In the preparation of elixirs talc is most commonly used as filter aid to remove turbidity Explain how this process works 6 Givr the role of the orange peel tincture benzaldehyde glycerin and syrup in the preparation Explain why the adjunctive solvents glycerin and propylene glycol are commonly added in manufacturing elixirs 7 8 Aside from sucrose what other material are used as sweeteners in preparing elixirs

For parallel reaction all following first order kinetics k 3B k 8C k 3D at time 1 0 initial mole of A is 1 If overall half life of reaction is 15 days and kyky kj 4 2 1 then log2 0 3 213 514 Number of moles of C after 45 days are 2 Number of moles of B after 30 days are Total moles at the end of reaction are 3 36 28 Ratio of moles of B D at any time except t 0 is 4

Comprehension 3 NaBr used to produce AgBr for use in photography can be self prepared as follows Fe Br FeBt FeB Br Fe Brg Fe Big Na CO3 NaBr CO2 FegO4 Mass of iron required to produce 2 06 x 103 kg NaBr A 420 g B 420 kg ii iii not balanced not balanced 11 C 4 2 x 105 kg D 4 2 108 g If the yield of ii is 60 iii reaction is 70 then mass of iron required to produce 2 06 x 103 kg Nap A 105 kg B 105 g C 10 kg D none

Ch31 P34 A rare decay mode has been observed in which 222 Ra emits a 14C nucleus The decay equation is 222 Ra AX 14C and you have identified unknown nuclide AX in the problem of Section 31 4 You ll need to use that answer in this problem a Find the mass change from the parent nuclide to the daughter nuclides Enter your answer to 7 SigFigs The mass change answers in nuclear decays must be correct to 6 places pas the decimal point Units are not required for this problem U b Find the energy emitted in the decay in units of MeV The mass of 222 Ra is 222 015353 u Enter your answer to 3sigFigs in MeV Units are not required in this answer

Consider the following reaction mechanism A A 21 K 4 B 1 K 1 B C K K K and K I and I are intermediates Which of the following expression is correct d C k A dt A 9 d C K K 41 B 4 C K 4 dt d C

second option in this case with or without selection of any correct op If speed of a wave 2 x 10 m s and valelength 3000 then Frequency 2 x 10 8 Hz Frequency 6 7 x 10 4 Hz Wave number 3 3 106 m Wave number 107 m 1

A glow worm of mass 5 0 g emits red light 650 nm with power of 0 10 W entirely in the backward direction What velocity v in m s will it have accelerated to after 10 years if released in free space and assumed to live Then v is

A hypothetical element Z exists in nature as two isotopes Z65 and Z67 with their relative abundances 25 75 respectively Then the average atomic mass in u of element Z is A 65 5 B 66 C 66 25 D 66 5

If A is the wavelength of the line for jump of the electron from 7th to 6th orbit and A that of the line for jump from 6th to 5th orbit then the wave number of the line for the jump from 7th orbit to 5th orbit will be

In aqueous solution Cd II exists as 6 coordinate aqua complex The solution on treatment with Br ion forms finally 4 coordinate Cd II complex with Br ions successively in four steps with stepwise formation constants logK 1 56 logK 0 54 logK 0 06 and logk 0 37 The higher value of K as compared to K is due to A transformation of trigonal complex into tetrahedral complex B change from octahedral to tetrahedral geometry C increase in AH of the reaction D large increase in the number of particles when fourth Br enters the coordination zone

The volume of nitrogen gas at STP required to cover a sample of silica gel with a monomolecular layer is 112 cm g of gel Calculate the surface area per gram in m of the gel if each nitrogen molecule occupies 16 0 x 10 22m Give your answer to the nearest single digit integer NA 6 x 10 3

If all the O atoms from 4 4 g CO 6 022 x 1022 molecules of N O 0 2 moles of CO and 1 12 L of SO gas at NTP are removed and combined to form O gas then the resulting gas occupies a volume of at NTP A 22 4 L B 44 8 L C 33 6 L D 11 2 L

HI cannot be prepared by the action of conc H SO4 on KI because A HI is a stronger acid than H SO4 B HI is more volatile than H SO4 C conc H SO4 is an oxidant and HI is a reductant D conc H SO4 is a dehydrating agent

Estimate the molal solubility of oxygen in water at 25 C and a partial pressure of 21 kPa Henry s constant of oxygen at 25 C 7 92 X 104 k Pa kg mol Select one a b 5 56 X 104 mol kg 2 60 X 104 mol kg 2 65 X 104 mol kg d 2 9 X 104 mol kg 290 X 104 mol kg C D

17 10 pts The mass of a proton neutron and electron is 1 661 x 10 27 Kg 1 662 x 10 27 Kg and 9 11 x 10 31 Kg respectively Calculate the total mass of the ion and the wt of Am protons in the space below

1 Sodium hydroxide NaOH is used to titrate benzoic acid C6H5COOH which has a pka of 4 19 Would methyl orange be a good indicator to use for this titration Explain why or why not 2 A new indicator was found at pH values less than 7 5 the indicator is blue and at values greater than 9 5 it is grey What is the approximate pka for this indicator

Which of the following represents correctly the changes in thermodynamics properties during the formation of mol of an ideal binary solution A C ve J mol Ok ve ve J mol AGmix AHmix TASmb Mole fraction ve TASmix AGmix AHmix Mole fraction B D AGmix TASmix AHmix Mole fraction ve J mot Ok ve ve J mol Ok ve TASmix AHmix AGmix Mole fraction

Which of the following graphs represent the behavior of ideal binary liquid mixture a Plot of 1 PTotal against yA is linear b Plot of 1 PTotal against y is non linear c Plot of PTotal against yA is linear d Plot of PTotal against y is linear

139 74 The degree of ionisation of an acid HA is 0 00001 at 0 1 M concentration Its dissociation constant will be a 109 c 10 b 10 11 d 10 7 What will be the ionisation constant of formic acid

Which of the following substances are responsible for slowing down of the rate of autoxidation A Butyl hydroxyl toluene skipped B C Sucralose Saccharin

V Litre of solution A Resistance 50 ohm is mixed with V Litre of solution B V 2 V Resistance 100 ohm Resistance of final solution is 80 ohm then will be using same cell Correct statement out of the following for penicillin is are

A compound formed by elements P and Q crystallizes in a cubic lattice where P atoms are at the com and Q atoms are at the body centre and alternate face centres of the cube Formula of the compound is 1 PQ 2 PQ2 PO

1 g of charcoal having surface area 3 02 10 m is mixed in 100 ml of 0 5 M acetic acid solution after few times concentrations of solution becomes 0 49 M what will be surface area occupied one molecule of acetic acid A 2 10 m C 6 10 m B 5 10 m D 10 m

C D is an elementary 2 The reaction A 2B g g process In an experiment the initial partial pressure of A B and Bare P 0 60 atm and P 0 80 atm When P 0 20 atm the rate of reaction relative B to the initial rate is 1 1 24 32 a 1 16 b C d 1 48

At a certain temperature for which RT 25 lit atm mol the density of a gas in gm lit is d 2 00 P 0 20 P where P is the pressure in atmosphere The molecular weight of the gas in gm mol If your answer is x write the value of x 10 IS