Physical Chemistry Questions

39 A current of dry air was passed first through a series of bulbs containing a solution of C6H5 NO in ethanol of molality 0 725 and then through a series of bulbs containing pure ethanol T 284 K loss in weight of the solvent bulbs was 0 0685 g Calculate the loss in weight of the solution bulbs A 4 60 g C 2 50 g B 5 20 g D 2 05 g

4 28 23 J K After hp 1 n 1 s 2 n 2 p n 1 d n 2 s R 8 35 m k 3 20 J K 4 28 23 J K orbitals are filled the next orbital filled will be 87 np h ch H DIG I SAT fau np 1 5 1 n 1 s 2 n 2 p 3 n 1 d 4 n 2 s

40 For an elementary reaction 2A g B g 2C g If initial pressure of A g is 20 torr and after 20 seconds total pressure becomes 25 torn point how long would it take total pressure to increase to 27 5 torr A 40 s B 60 s C 30 s istroud mistry Exe

A mixture containing 1 12 litre D and 2 24 litre of H at NTP is taken inside a bulb connected to another bulb through a stop cock with a small opening The second bulb is fully evacuated The stop cock is opened for a certain time and then closed The first bulb is now found to contain 0 10 g of D Determine the by weight of the gases in second bulb 41 66 58 33

72 Which of the following complex is not correctly matched with its geometry 1 NiCl Ph P tetrahedral 2 Co Py 1 square planar 3 Cu CN tetrahedral 4 Fe CO square planar

9 In a cubic lattice A atoms occupy the corners B atoms occupy all the face centers except one and C atoms occupy the alternate edge centers The formula of the unit cell is 1 AB 3C 3 3 A B5C 2 AB5C3 4 A B5C3

The correct statement regarding SO molecule is 1 two pr dr bonds 2 molecules has 2 lone pair 20 bonds and 2 bonds 3 two pr pr bonds 4 one px pr and one pr dr bond

One gram of silver gets distributed between 10cm of molten zinc and 100cm of molten lead at 800 C The percentage of silver still left in the lead layer is approxiamtely A 94 B 97 C 69

1 c 1 3 d 1 1 55 A hydrogen electrode placed in a buffer solution of CH3COONa and acetic acid in the ratio s x y and y x has electrode potential values E volt and E2 volt respectively at 25 C The pKa values of acetic acid is E and E2 are oxidation potential E E b 0 118 a c 2212 E1 E2 0 118 d E2 E1 0 118 E1 E2 0 118

154 The correct order of bond angles smallest first 2010 10 in H S NH3 BF3 and SiH4 is A H S SiH4 NH3 BF3 B H S NH3 BF3 SiH4 C H NH3 SiH4 BF3 D NH3 H S SiH4 BF3 A 200 E

A thin ring of radius R has a charge Q non uniformly distributed on it The electrostatic potential at the center c the ring will be Zero Q 4 E R 2Q 4TE R Insufficient information

30 The magnetic moments of complexes given below are in 30 fa the order 1 Ni CO II Mn CN III Cr NH 1 IV CoF 1 1 I II III I 2 I III N 3 N II I III 4 N II I III of Pt 31

25 In forming C C and ii 0 the electrons respectively are removed from A 2pz or 2px and 2py or 2px B 2 y or 2px and 2py or 12px 2py C 12py or 12px and 2py or 2px D 2py or 2px and 2py or 2px D C E T 2009

cations radius r occupy Octahedral holes in the FCC of anions radius R such that there is no distortion in the FCC lattice the perimeter of the shaded region is A 4r 2R C 4r 5R Face centres Rock salt type B 4 r 2R D 4 r R

For which of the following reaction AH AU CaCO3 s CaO s CO g N g 3 H g 2 NH3 g CH4 g 2 O g CO g 2 H O 1 H g 1 g 2 HI g hr

If the heat of solution for one mole of KCI in 20 moles of water and 200 moles of water are 3 80 kcal and 4 40 kcal respectively then the heat of dilution is O 8 20 kcal 8 2 kcal 0 60 kcal 0 60 kcal

160 4 None of these 74 Value of screening constant for 39th electron of 39Y 1 39 2 36 3 18 4 20 4 74 Y 39 39 1 39 2 36 3 18 4 20 for fre 10 15 25 22p6 35 3 p 45 44 036 28 36 2 36

he rate constant for a first order reaction whose half life is 480 sec A skipped B 1 44 x 10 3 sec 1 D 1 44 x 102 sec 1 C 0 72 x 10 3 sec 1 2 88 x 10 3 sec 1

For given following equations and AH values determine the enthalpy of reaction at 298 K for the reaction C H4 g 6F2 g 2CF4 g 4HF g H g F2 g 2HF g AH 537 kJ C s 2F2 g CF4 g AH 680 kJ 2C s 2H g C H4 g AH 52 kJ A 1165

c 1 3 d 1 1 55 A hydrogen electrode placed in a buffer solution of CH3COONa and acetic acid in the ratio s x y and y x has electrode potential values E volt and E2 volt respectively at 25 C The pKa values of acetic acid is E and E are oxidation potential E E b 0 118 c 2212 E E2 0 118 E2 E1 0 118 E E2 0 118 d E fo a b d 63 Sil 0 1 H

4 K CO NO 4J 71 Which of the following will exhibit maximum lonic conductivity 1 K Fe CN6 3 Cu NH3 4 Cl 2 Co NH3 6 Cl3 4 NI CO 4 following complex is not correctly matched

Which one of the following has greater active mass 1 200 gm of lime stone in 2 lit vessel 2 90 gm of CS liquid in 100 ml vessel 3 56 gm of N gas in 0 5 lit vessel 2 4 1 mole of O gas at STP

For a first order reaction A products the rate of reaction at A 0 2 M is 1 0 x 10 2 mol litre min The half life period for the reaction is 832 s 440 s 416 s 14 s

Pressure exerted by vapours above the surface of liquid in liquid gas equilibrium depends on Temperature Surface area Nature of liquid Both 1 and 3

4 A solution of sucrose molar mass 342 g mol has 64 been prepared by dissolving 68 5 g of sucrose in 1000 g of water The freezing point of the solution obtained will be K for water 1 86 K kg mol 1 0 570 C 3 0 520 C 68 5 g 1000g FICK HE 342 g mol anya facer ariel Glyen facer GHIA for 68 5 342 X You 2 0 372 C 01 1 86 x 62S 2 0 372 C 342 T T 4 0 372 C 4 0 372 C For the reaction 2A B 3C D which of the following 65 3fff 2A B 3C D K 1 86 K kg mol 1 0 570 C 3 0 520 C

A student prepares four 0 10 molal aqueous solutions each containing one of the solutes given below Which solution has the lowest freezing point K4 Fe CN 6 KOH CH3COOH

A compound formed by elements X and Y has a cubic structure in which X atoms are at the corner of the cube and two atoms Y are at each body diagonal of the cube If all atoms from one body diagonal of the cube are removed then formula of the compound is A XY B XY3 C XY D XYg

the half life period for catalyst decomposition of AB3 at 50 mm is found to be 4 hours and at 100 mm it is 2 0 hour The order of the reaction is A 3

on takes place in three steps with individual rate 55 constant and activation energy Rate constant Step 1 Step 2 Step 3 k k mak 1 140 kJ mol 3 130 kJ mol K K K3 overall activation energy of the reaction will be 2 150 kJ mol overall rate constant k Activation energy Ea 180kJ mol Ea 80kJ mol Ea 50kJ mol 2 3 K AC A

24 How many grams of 70 by weight concentrated nitric acid solution should be used to prepare 250 mL of 2 0 M HNO3 1 54 0 g conc HNO3 2 45 0 g conc HNO3 3 90 0 g conc HNO3 4 70 0 g conc HNO3

The conductivity of a saturated solution of Ag PO4 is 9 x 10 6 S m and its equivalent conductance is 1 50 10 4 Sxm equivalent The K of Ag3PO4 is A 4 32 10 18 C 8 64 10 13 B 1 8 10 9 D 4 32 10 13

The total number of protons in 10g of calcium carbonate is No 6 023x10 23 Quizz 9 1 5057x10 24 23 2 0478x10 24 X 45 3 0115x10 24 14 4 0956x10 24 9 None of these

Two reactions I A Products II B Products follow first order kinetics The rate reaction I is doubled when the temperature is raised from 300 K to 310K The half life for this reaction at 310K is 30min At the same temperature B decomposes twice as fast as A If the energy of activation for reaction I is twice that of reaction II calculate the rate constant of reaction II at 300K

67 Half life time of the following first order reaction is 20 min 6 A g B g C g If initial pressure of A g is 1 atm then the total pressure of system after 80 min is 1 1 5 atm 2 1 75 atm 3 1 93 atm 4 2 5 atm inte 15 16

An imaginary place in three steps X A AH 91 B A AH 92 B Y AH 93 If Hess law is applicable then the heat of the reaction X Y is reaction X Y takes A 91 92 93 C 92 93 91 91 92 93 Correct Answer

28 20 g of magnesium carbnate sample decomposes on heating to give carbon dioxide and 8 0 g magnesium oxid What will be the percentage purity of magnesium carbonate in the sample At Wt Mg 24 1 60 2 84 3 75 4 96

Which of the following electronic configuration represents a sudden large gap between the values of second and third ionisation energies of an element 1 1s 2s 2p 2 1s 2s 2p 3s 3p 3 1s 2s 2p6 3s 3p 4 1s 2s 2p6 3s

An atom X has an electronic configuration 2 8 7 It combines with Y having 2electrons in its outermost shell 1 what type of bond will be formed between X and Y ii Show the formation of compound with owic dot diagra

Copper 1 sulfate is produced when copper is heated with sulfur If 1 5 g of Cu was heated with an excess of sulfur to yield 1 76 g of Cu2SO4 what is the yield for this reaction 75 98

ilic A hydrocarbon has molecular formula C8H12 In this hydrocarbon only one H molecule can be added On ozonolysis it gives symmetrical diketone The hydrocarbon is 1 2 3 CH CH

Metal excess defect due to the presence of extra cations interstitial sites Zinc oxide is white in colour at room temperature On heating it loses oxygen and turns yellow y mg Si Zno heating 1 Zn O 2e 2 2 Now there is excess of zinc in the crystal and its formula becomes 1 xO The excess Zn ions move to interstitial sites and the electrons neighbouring interstitial sites

CAREER 63 Wavelength of a light beam is 25 m Its wave number is 63 25 m 1 4 0 x 10 cm 1 14 2 4 0 x 106 cm 1 3 4 0 x 106 m 1 4 25 0 104 cm 1 4 0 x 10 cm 1 2 4 0 x 106 cm 1 3 4 0 x 106 m 1 4 25 0 x 104 cm 1 D 1 25X 0 104x10

Which of the following complex is an outer orbital complex 36 Fertighar para tigh outer orbital comp x TOK 4 Cr CO Mn CO V CO Sc Ti V Cr 25 1 Ni NH3 2 Mn CN 3 Co NH 6 3 4 Fe CN d 8 21 ALALALA 2 2 d g2 721 2 1 Ni NH3 2 Mn CN 6 3 CO NH 1 d7 4 Fe CN de 1272 22 1 1 d 2229499 12121212 1 Al

19 25 3 g of sodium carbonate Na CO3 is dissolved in enough water to make 250 mL of solution If sodium carbonate dissociates completely molar concentration of sodium ion Na and carbonate ions CO are respectively Molar mass of Na CO3 106 g mol 1 0 477 M and 0 477 M 2 0 955 M and 1 910 M 3 1 910 M and 0 955 M 4 1 90 M and 1 910 M

9 A sample of nitrogen gas is bubbled through liquid water at 25 C and then collected in a volume of 750 cc The total pressure of the gas which is saturated with water vapour is found to be 740 mm at 25 C The vapour pressure of water at this temperature is 24 mm How many moles of nitrogen are in the sample 0 028

The value of AH in kJ for the reaction will be CS2 1 4NOCI g CCl4 1 2SO g 2N g if AH CS x AH NOCI y AH f CCl4 z AH SO r A B C x 4y z 2r r z 4y x 2r z 4y x

3 All the metal ions contains te configurations Which of 73 the following complex will be paramagnetic 1 FeCi CN 0 2 K Fe CN 3 Co NH CI 4 Fe CN 0 1 5

If the P E of an electron is 6 8 eV in hydrogen atom then what is the K E total energy and the orbit where electron exist are respectively A B C K E 6 8 eV Total energy 6 8 eV n 2 K E 3 4 eV Total energy 3 4 eV n 2 K E 3 4 eV Total energy 3 4 eV n 4

9 From elementary molecular orbital theory we can deduce the electronic configuration of the singly positive nitrogen molecular ion N as 2 A 015 015202 202s 22p 02p B 01s201520252025 202p 2p C 0 20 o 015 0 15 025 0 25 02p 2p4 D 15 0 15 025 02s 2p 2p O F C 20 2 On 2 0 2022 1

In the following reaction which choice has value twice that of the equivalent mass of the oxidising agent SO2 H20 3S H20 Quiz AB 15 64 33 32 33 16