Physical Chemistry Questions

List 1 Condition for the system parameter when Non PV work is zero P dH 0 Tds dq R dU 0 List 11 Comment on the nature of spontaneity o the process 1 Spontaneous 2 Non Spontaneous 3 Equilibrium

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Identily comply bromine dissolved in carbon tetrachloride 1 It is a solid liquid homogeneous mixtu re 2 After separation bromine cannot be br oken down into simpler substances 3 Carbon tetrachloride has the propertie s of carbon and chlorine 4 Bromine and carbon tetrachloride can be separated by a separating funnel Can you please explain the answer to this q

OUR DEPARTMEN CHNICAL MARKE PROJECT MANAGMENT

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Solid calcium fluoride and solid barium fluoride are in equilibrium with a solution containing 9 76 103 M barium acetate Calculate the concentration of calcium ion present in this solution calcium M

The Haber Bosch process involves the combination of nitrogen and hydrogen at high temperatures in the presence of a catalyst to produce ammonia It is currently the main industrial source of ammonia N g 3H g 2NH3 g Assuming that a reaction vessel originally contains 0 350 moles of N and 0 550 moles of H answer each of the following questions a How many moles of NH3 could be produced from these quantities of N and H NH3 0 3667 b After the reaction is complete how many moles of N would remain N 0 1833 c After the reaction is complete how many moles of H would remain H 0 mol mol moles

For the estimation of nitrogen 1 4 g of an organic compound was digested by Kjeldahl method and the M evolved ammonia was absorbed in 60 mL of sulphuric acid The unreacted acid required 20 mL of 10 M 10 sodium hydroxide for complete neutralizaton The percentage of nitrogen in the compound is JEE Main online 2014 A 3 B 5 C 6 D 10

Name the product of chemical reaction of but 1 3 diene with chlorine 1 2 dichlorobutane 1 3 dichlorobut 1 ene 1 4 dichlorobutane O 1 4 dichlorobut 2 ene 1 2 dichlorobut 2 ene

1 n 1 2 21 1 1 1 I n 1 9 1 n 1 2 2 21 1 1 1 I n 1

Consider the following chemical equation 2NaOH H SO4 Na SO 2H O The informations conveyed by this equation are 1 NaOH reacts with H SO to produce Na SO and water 2 For every one molecule of H SO4 two molecules of NaOH are required III Acids and bases are non ionic in nature IV This is not a redox reaction The correct statements are a I and II b II and III

Consider the following physical transformation X s X aq If one were to write an equilibrium constant K for the process Assi K X aq X s K X aq K

Solid calcium fluoride and solid barium fluoride are in equilibrium with a solution containing 9 76 103 M barium acetate Calculate the concentration of calcium ion present in this solution calcium M

Describe the position of electrons around one O atom in the Lewis structure of O Select one O a 3 shared electron pairs Ob 3 shared electron pairs 1 lone pair O c 2 shared electron pairs 2 lone pairs O d 1 shared electron pair 3 lone pairs O e 2 shared electron pairs 1 lone pair 4

4 How much energy must be supplied to break a single sodium 23 nucleus into separated protons and neutrons if the nucleus has a mass of 22 983733 amu How much energy is required in BTU mole of this nucleus 15

In an electrolytic cell containing molten Cal2 Select one a Ca is deposited at the anode b Current flows from the cathode to the anode through the solution c Ca2 gains electrons d lodine is released as I e 12 is released at the cathode

N 24 What is the weight of available oxygen from a solution of H O if 20 ml of this solution needs 25 ml KMnO for complete oxidation 1 59 30 01 g 2 4 0 25 g 0 5 g

The cell reaction for the Zn H cell is Zn s 2H aq Zn aq H g Standard cell potential is 0 76 V and the cell potential at 298K is 0 45 V Calculate the pH of the cell if Zn 1 0 M and PH 1 0 atm at equilibrium H

onsider the following statements 1 137 a Velocity of electron is th velocity of light b First line of Balmer series will be more intense compared to second line c Radius of third orbit of Li2 ion is 1 5 times more than radius of second orbit of He ion Correct among the following is are 1 a only 2 b c only 3 a c only 4 a b c are correct

What is the a molar enthalpy of the ammonium chloride water solution cal mol and b partial molar enthalpy of each component cal g given that mass of NH4Cl 0 103g mass of H2O 100g Specific enthalpy of solution 54 8533 cal g

Incorrect among the following is are a Number of electrons having m 0 in Na are 7 b Energy of 4s orbital is more than 3d in H atom c Energy of 2s orbital in O is more than carbon 1 a only 2 b only 3 a b only 4 c only

e 04 Calculate Bond Pairs BP s 1 mark Calculate Lone Pairs LP s 1 mark Draw Lewis Structure 1 mark VSEPR Notation 0 5 mark Predict of then molecular Shape 0 5 mark Polarity 0 5 mark Provide the reason and justify your answer for the polarity

Prepare a control chart and evaluate whether or not the data meet each criterion for stability in control chart Sample Recovery Sample Recovery Sample Recovery 1 94 6 10 104 6 18 104 6 2 93 1 11 123 8 19 91 5 3 100 0 12 93 8 83 1 4 122 3 13 80 0 100 8 5 120 8 14 99 2 123 1 6 93 1 15 101 5 96 2 7 117 7 16 74 6 96 9 8 96 2 17 108 5 102 3 73 8 9 20 21 22 23 24 25

1 12 pts Describe how you would measure the density at room temperature of a pure substance composed only of this molecule You will need to figure out if this substance is a solid liquid or gas at room temperature and make your plan according to this Be creative and assume you have access to whatever glassware equipment and instruments you need a Describe your stepwise procedure here Include details about the kind of glassware and equipment you are using for each step Make sure you include any calculations you would need to perform on your measurement s to determine the density

electrochemical cell Mg s Mg OH 2 s NaOH aq MgCl aq Mg s given that E for the reduction half cell reaction is 2 369 V and E for the oxidation side is 2 690 V at 298 15 K You can assume that the solutions are ideal Enter in your answer to 2 decimal places in units of x10 11 Your Answer E E Answer RT InQ X b b 4ac 2a Constants and Conversion Factors ax bx c 0 fxdx Data for H O Standard values all at 298 15 K PH O 3175 Pa at 298 15K AH H O 285 83 kJ mol T273 15 K 1 1 Arus H 6 008 kJ mol K 0 51 K kg mol Tap 373 15 K dr X R 8 314 J K mol 0 08206 L atm mol K 0 08314 L bar mol K N 6 022 x 1023 mol g 9 81 m s 1 Pa 1 kg m s 1 L 1 dm10 m 1 kJ 1000 J 1 atm 101325 Pa 1 01325 bar 760 Torr 1 atm 1 bar 10 Pa 100 kPa 1 L atm 101 325 J Inx e de dx F 96485 C mol 1J 1 kg m s Avap H 40 646 kJ mol K 1 86 K kg mol M 18 02 g mol

A student at GCC made a saturated solution of Ca 103 2 by adding 256 gr of Ca 103 in 2 0 L of pure water Calculate the molar solubility of this salt at 298 K Ksp of Ca 103 2 2 0 x 10 6 O 3 9 x 10 3 O 7 9 x 10 3 O 4 4 x 10 3 O We can t tell since too much salt is in water 6 6x10 3

A mixture of liquids A and B exhibits ideal behavior At 74 C the total vapor pressure of a solution containing 1 6 moles of A and 2 7 moles of B is 321 mmHg Upon the addition of another mole of B to the solution the vapor pressure increases to 338 mmHg Calculate the vapor pressures of pure A and B at 74 C

Example 7 8 Phosphorus pentachloride decomposes according to the equation PCI g PCl3 g Cl g 1 00 mol of PCl is placed in a closed container of 5 0 L capacity and heated to 523 K What will be the composition of the mixture when equilibrium is attained at 523 K The equilibrium constant K for the reaction at 523 K is 1 80

Brass an alloy of copper and zinc can be produced by simultaneously electroplating the two metals from a solution containing their 2 ions A 32 83 A current is applied to the brass If 78 82 of the total current is used to plate copper while the rest goes to plating zinc what is the mass percent of copper in the brass Record your answer with one decimal

The densities of solid and liquid silver MW 107 9 g mol are 11 7 g mL and 10 5 g ml respectively The normal melting point of silver is 962 C The enthalpy of fus of silver is 12 0 kJ mol What is the melting point in C of silver under an applied pressure of 500 atm

A plane electromagnetic wave of frequency of 50 MHz travel in free space along x axis At a particular point in space and time amplitude of electric field vectors is E 9 3 V m What is amplitude of magnetic field vector at that point 3 1x 10 8 T 3 1 10 7 ki 9 3x10 8 KT

Suppose you have 600 0 grams of room temperature water 20 0 degrees Celsius in a thermos You drop 90 0 grams of ice at 0 00 degrees Celsius into the thermos and shut the lid a What is the equilibrium temperature of the system Provide your final answer with three significant digits of precision here b How much ice is left in grams

calculate the packing fraction of BCC unit cell Half life of a first order reaction at a given temperature is a 3 min Calculate the time required for the completion of 3 4 th of the reaction a 12 min b 6 min c 24 min d 20 min mothoxymothon c HI

A 1 000 g sample of an alum is dissolved and sulfate is precipitated as BaSO The precipitate weighed 0 466 g after it was washed dried ware in the form K Al SO 24H O calculate the percentage if ALO in the sample Given Atomic mass of Ba 137 S 32 Al 27 alum A 3 4 B 13 2 C 1 7 D 6 8

An experiment calls for 185 mL of a 1 55 M solution of hydrochloric acid Stock solutions of concentrated hydrochloric acid are 12 4 M How many mL of stock solution would need to be diluted in order to make the solution required for the experiment O 14 8 mL O 23 1 mL O 2 31 x 102 mL O 9 59 x 10 3 mL O 1 48 mL

Element A with minimum atomic number in which last electron has n m 3 but divisible by 3 bra How many given statements are correct about A n Principal quantum number m magnetic quantum number 1 Sum of group number and period number in Modern Periodic Table is even number ii Element belongs to s block iii Element belongs to IIIA group number iv Element is a metal v Atomic number of element is divisible by 3 vi Another element B has an atomic number atomic number of A 10 then element B belongs to III B group vii Element A has largest radius in their period viii The group in which element A is present has maximum elements in Modern Periodic Table to pa

3 pts For a pair of certain electron donor and acceptor pair A G 1 065x10 J Which scenario would you predict would have the fastest electron transfer A Distance is 20 angstroms reorganization energy is 5 065x10 19 J B Distance is 20 angstroms reorganization energy is 1 065x10 19 J C Distance is 60 angstroms reorganization energy is 5 065x10 19 J D Distance is 60 angstroms reorganization energy is 1 065x10 19 J 1

8 Calculate the total heat in kJ required to convert 10 0 grams of liquid ethanol MM 46 07 g mol at its boiling point to gaseous ethanol at 158 C Note that not all of the data below is necessary for this problem AH 40 5 kJ mol AH 5 10 kJ mol 1 14 kl 6 28 kJ 9 93 kJ MP 115 C BP 78 C Cand 1 88 J g C Chand 2 45 J g C C 1 43 J g C

CI None of these acid halide anhydride least reactive acid halide ester amide anhydride most reactive least reactive amide anhydride acid halide ester most reactive least reactive acid halide anhydride ester amide most reactive least reactive amide ester anhydride acid halide most reactive least reactive ester amide anhydride acid halide most reactive

Xe Oa Calculate Bond Pairs BP s 1 mark Calculate Lone Pairs LP s 1 mark Draw Lewis Structure 1 mark VSEPR Notation 0 5 mark Predict of then molecular Shape 0 5 mark Polarity 0 5 mark Provide the reason and justify your answer for the polarity

Which of the compounds would have the weakest conjugate base O cyclohexanone with a Ka 5 X 10 16 O cyclopentadiene with a Ka 1 X 10 15 acetylene with a K 1 X 10 25 2 chloroethanol with a K 2 X 10 14

3 5 Concentration of glucose C6H 2O6 in normal blood is approximately 90 mg per 100 mL What is the molarity of the glucose solution in blood 1 5 M 2 0 005 M 3 0 05 M 4 1 M

35 Match the metal Column I with its reaction with oxygen Column II A B a Column I Potassium b x c i ii iii iv A iv B iii C ii D i A iv B ii C i D iii A iii B ii C i D iv A iv B ii C iii D i C D Silver Zinc Copper Column II Does not react event at high temperatures Gets coated with black coloured layer of oxi Does not burn at ordinary temperature Burns vigorously

1 12 pts Describe how you would measure the density at room temperature of a pure substance composed only of this molecule You will need to figure out if this substance is a solid liquid or gas at room temperature and make your plan according to this Be creative and assume you have access to whatever glassware equipment and instruments you need a Describe your stepwise procedure here Include details about the kind of glassware and equipment you are using for each step Make sure you include any calculations you would need to perform on your measurement s to determine the density b Choose one measurement e g mass volume length etc you described in a Describe one way

1 A steel tank contains air at a pressure of 15 bar at 20 C The tank is provided with safty valve which can withstand a pressure of 35 bar Calculate the temperature to which tank can be safely heated

A Molarity Imole in slit Sol MATB 1 Molar V L 20 166 X 480 Imole in 980 Solut mole of solut volunce u seln m1 Soluti 50 wen 20gm y 1 45 M AB C MATA x 1000 X1000 molal Imole in sing of solvent v y 2 IND I more concentrated 1 202 Imole in Ike solut

a For pure oxygen O2 gas at 0 C calculate the molecular density in the form of molecule cm3 in the following cases i and ii b In the following cases i and ii what is the average velocity of the N2 molecule 1 mole of oxygen atoms 16 g i at standard atmospheric pressure 1013 mbar normal pressure is accepted ii at 10 10 mbar pressure UHV and 1000 km above the ground surface Assume O2 gas behaves as an ideal gas

Suppose a 250 mL flask is filled with 0 70 mol of H and 0 80 mol of HI This reaction becomes possible H g 1 g 2HI g 1 Complete the table below so that it lists the initial molarity of each compound the change in molarity of each compound due to the reaction and the equilibrium molarity of each compound after the reaction has come to equilibrium Use x to stand for the unknown change in the molarity of H You can leave out the M symbol for molarity initial change 0 X 1 0 HI 0 A X

A mixture of 20 ml of methane and 20 ml of O is exploded and cooled at room temperature If the reaction between the two substance is written as CH4 20 CO H O then final volume of the gaseous mixture is 1 10 ml 2 20 ml 3 30 ml 4 60 ml