Physical Chemistry Questions

Using the data in the table calculate the rate constant of this reaction k A B C D 1 404 Incorrect Trial 1 2 3 Units A M B M 0 360 0 200 0 360 0 440 0 432 0 200 M S 1 Rate M s 0 0230 0 111 0 0276

In the Example of resonating structures of N20 cannot we simply rule out the other two since they do not obey the r ule which states that negative charge should be on electro negative element and positive charge on electropositive el ement

Use the given data to calculate the atomic mass of Chlorine Show your work and use correct number of significant figures Natural Percent Abundance 3517C1 75 7700 3717CL 24 2300 Average Mass 34 9690 36 9660

69 H2 g and N2 g were placed in a vessel of constant volume and allowed to reach equilibrium according to the following reaction 92 kJ N2 g 2NH3 AHxn 3H g Concentration N H NH Time t t Which of the following is are true for the system between t t I The temperature of the system will decrease II The rates of the forward and reverse reactions were equal III The rate of formation of NH3 is equal to the rate of disappearance of H IV If more NH3 g is added to the system at time to while the temperature is held constant total pressure in the container will decrease A I and II B II and IV C III only D II only

An unknown particle with a mass of 9 10x10 28 grams has wavelength of 9 5 um Use this info to calculate the velocity of the unknown particle in m s Report your answer to 2 or 3 sig figs Do not include units

An assumption for B E T theory 1 point is O All of the mentioned O The adsorption at one site never affects the adsorption at the neighbouring site Physical adsorption of adsorbate is O always occurred resulting in the formation of the multilayers Solid surface possess uniform localised sites

10 ml of a weak acid HA solution is 20 dissociated in water This solution iscompletely neutralized by 10 ml of 2x10 M NaOH solution Which of the following is are correct abou the solution log 2 0 3 A B C D pH of weak acid HA solution was 3 4 The dissociation constant of weak acid HA was 1x10 pH of solution after addition of NaOH is 7 5 Kh hydrolysis constant of the salt is1x10

Q28 NTA Test 33 Single Choice IM NH OH and IM HCl are mixed to make a total be the volume ratio of NH OH and HCI mation A 2 1 C 2 3 mathume of 300 mL If pH of the mixture is 9 26 and pK NH 9 26 then mathong mathongo B 1 2 D 3 2

A metal oxide has the formula Z 03 It can be reduced by hydrogen to give free metal and water 0 1596 g of the metal oxide requires 6 mg of hydrogen for complete reduction The atomic weight of the metal is 1989 a 27 9 c 79 8 b 159 6 d 55 8

Q A chemical compound exists in two forms one of which in is found in 10 more than double of other Their respective weights are 220 5 and 225 6 Calculate the average atomic mass of the compound Show proper calculation

Which among the following is a first order reaction 2 NH3 g N O g 2H O 1130K Pt catalyst N g 3 H g 2NO g 1 0 g 1 alkaline medium hr m 2H O O 2 NO g O g 2 NO g

39 Which among the following occurs in the given reaction 2PbO C2Pb CO2 A Lead is getting reduced B Lead dioxide is getting oxidized C Carbon is getting oxidized D Lead oxide is getting reduced

34 Arrange the following ecosystems in decreasing order of productivity Only one correct answer Review A Sugar cane field coral reef tropical rain forest estuary Coral reef estuary sugarcane field

i and i as shown in the diagram If ratio of their radil is concentric circular loops carrying current MEC 1 2 and ratio of the magnetic field due to A and B at the centre is 1 3 then the ratio of 4 1 1 2 C 13 will be 2 3 4 Loops 1 2 3 carry same current Torque on loon 1 is Class XIII Spartan batch Electronics Modern Physics Vector 1 0 Projectile fergen sefla en 1 12 fef 1 1 2 y 3 A 4452 6 F B A BI 1 21 A 1 3 11 12 11 12 2 12 XY1 1X2 B2

2 4 ms 3 15 ms 1 2 4 sinzo x8 xXx 2 4 ms gax 2 XXXsing 4 3 ms xxx 4 3 ms 3 15 ms ms 26 From the top of a tower of height 40 m a ball is projected 126 40 m HR20 m s 30 upwards with a speed of 20 m s at an angle of elevation of 30 Then the ratio of the total time taken by the ball to hit the ground to the time taken to ball come at same level as top of tower R M 844 3 20 24 sino uso rom 1 2 1 2x sino 2 3 1 FAR 1 2 1 y nmax 20m u w50 2h Raufan Uw 146 2 3 1 P Unus y R Z

9 Identify a N the following as atoms molecules or formula units b Co c CO d NaCl e H O 10 Find the molar mass of the following a H SO4 b Ca NO3 2

so that block of mass m just begins to move up the frictionless plane 1 Mg tan 0 2 2 Mg cote 2 Mg cos o 1 sine A force P to be applied to the 28 me and fit for w MEC Electronics Modern Physics Vector 1 D Projectile XIII Spartan Batch fed det ut amal she wr M 3 4 None A person who weights w newtons stands on a scale in elevator that is initiall 1 Psine 1 Mg tan 0 2 2 Mg cot0 2 3 4 Mgcos 0 1 sin 0 M Puso mysino Peso P mg tano tamo

is the movement of 1p charged surfaces with corresponding ions and H2O in the stationary liquid induced by an external field O Colloidal suspension O Emulsion O Micro emulsion

The vapour pressure of a solution having 2 0 g of solute X gram atomic mass 32 g mol in 100 g of CS vapour pressure 854 torr is 848 9 torr The molecular formula of the solute is 1 X 3 X 2 X 4 X8

ary man rain appears to be falling at his back at an angle 30 with the vertical As he starts movin forward with speed of 0 5 m s He find that the rain is falling vertically 132 14mmeren of the fa a Class XIII Spartan Batch MEC KTG 2 D Relative Motion The speed of rain with respect to the stationary man is 1 0 5 m s 2 0 53 m s 3 1 0 m s 4 0 43 m s 3 A projectile is thrown with velocity v at an angle 0 with the 133 horizontal When the projectile of the ondt ge sfera vial font a arer formareen fera fas under givit 30 six 0 5 m s far from for end wit 1 0 5 m s 2 0 53 m s 3 1 0 m s 4 0 43 m s

The potential difference between the fixed charged layer and the diffused layer having opposite charge is called O Zeta potential O Electrokinetic potential O sedimentation potential 1

The compression factor compressibility factor for one mole of a vander Waals gas at 0 C and 100 atmosphere pressure is found to be 0 5 Assuming that the volume of a gas molecule is negligible calculate the vander waals constant a A 1 2544 atm L2 mol B C 125 44 atm L2 mol 12 544 atm L2 mol 2 2

5 Identify the wrong statement in the following a Amongst isoelectronic species smaller the positive charge on the cation smaller is the ionic radius b Amongst isoelectronic species greater the negative charge on the anion larger is the ionic radius c Atomic radius of the elements increases as one moves down the first group of the periodic table d Atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the periodic table 2012

9 10pts Following figures depict changes in various physical properties during a physical transformation Determine whether this physical transformation is the 1st order or the 2nd order phase transition Explain your answer Volume V Enthalpy H Chemical potential Entropy S Heat capacity C

For A g 3B g 2C g If initial pressure of A Po and after time t from the start of reaction th total pressure is p then the rate constant reaction is given by NCERT Pg 10 1 In 2 the In po 5p 4p 4p 3 In p 5p

3 20 m s 28 4 20 5 m s 5 50 22 A car completes two laps around a 1 0 km race track at an 22 25 0 m s 31 0 km V2 average speed of 25 0 m s If the car is to have an aver age speed of 28 0 m s for four laps what should be its average speed for the last two laps 1 28 0 m s 28x28 28 V2 2 31 0 m s 3 31 8 m s 4 32 2 m s 7 25 1 106 140 12 26 428 540 2 14 11 2 10 m s 3 20 m s 4 20 5 m s 28 m s fax se stem and d alfa 3 2 km 1 28 0 m s 2 31 0 m s bear 3 31 8 m s 48 H ux 3 3407 PRXX km 2X26X2

Solvelancer Test Choose the correct statement Solvelancer Test a The study of gases is much easier than study of liquids because the gases are easily compressible b The study of gases is much easier than study of liquids because the particles in gases are present far from each other thus no interparticle in teraction between them c The study of gases is much easier than study of liquids because the physical properties of gases are identical d None of the given statement is correct

Which of the following general electronic configuration s belong s to a representative element i ns 1 2 n 1 d 1 10 ii ns 2 np 1 6 iii ns 2 n 1 d 0 1 n 2 f 14 1 2 iv ns A i and iv B ii and iv C c ii and iii i and iii

21 A particle is projected in the X Y plane with y axis along vertical 2 sec after projection the velocity of the particle makes an angle 45 with the X axis 4 sec after projection it moves horizontally Find the velocity of projection 1 10 5 m s 2 10 m s 3 20 m s 4 20 5 m s 60 20m s 457 10m 400x 25 50 39 28 2X25 x V 25 1 4 X Y Z 2 48e 40x2 800 800 h 2440 1 10 5 m s 2 10 m s 3 20 m s 4 20 ml 10 6 4 60 45 20m s 457 a f uxs3 BABARNANTY 10m 40560 u 8 20 CUS 20 XX 20 x2

According to Langmuir adsorption isotherm amount of gas adsorb at very high pressure 1 point O Reaches a constant limiting values O Increasing with pressure O Decreasing with pressure Increasing first and decreasing later with pressure

denly put into neutral gear i e allowed to coast the ve driven at 20 m s on a level road is sud 13 2 kg locity decreases in the following manner 1 20 t S where t is the time in sec The deceleration of car at the instant its speed is 10m s is 1 1 4 m s 2 1 2 m s 3 1 m s 4 3 4 m s 20 a yov dx 20 m s MEC Electronics Modern Physics Vector 1 D Projectile s XIII Spartan Batch L0 20 ax 20 m s A car is moving uniformly on a road and appears t aran Berita for it ht fan V 3 1 m s 4 3 4 m s 20 248 itt et 44 second ame 10m s 1 1 4 m s 2 1 2 m s 20 20m s Lo LO 20 1 4 0

Which of the following reactions represents a disproportionation reaction A 2H 20 2 aq 2H 20 1 O2 g B Zn s 2HCl aq ZnCl 2 aq H2 g C C s O2 g CO 2 g D 2Na s 2H000 2NaOH aq Ho a

Read the passage given below and answer the following question The shape of a molecule depends upon the number of valence shell electron pai lp and bp around the central atom and magnitude of repulsive forces between them Sidgwick and Powell in 1940 proposed a theory which was later develope and redefined by Nyholm and Gillespie for predicting the shape of a molecule Th theory came to be known as VSEPR Valence Shell Electron Pair Repulsion theo According to it the valence shell is taken as a sphere with the electron pairs localizing on the spherical surface at maximum distance from one another The molecules are classified into the following two categories to predict the geometrical shapes of molecules using VSEPR theory Molecules in which the central atom has no lone pair Molecules in which the central atom has one or more lone pairs Which of the following statements is correct about PCI 5 molecule A All the bonds are equal B The geometry is octahedral C Five lone pairs are present on the central phosphorus atom It hee to

4 m A buffer solution is prepared in which the concentration of NH3 is 0 30 M and the concentration of NH4 is 0 20 M If the equilibrium constant K for NH3 equals 1 8 105 what i the pH of this solution log 2 7 0 43 3 11 72 2 9 43 1 9 08 4 8 73 potentials for

0 The specific conductance of saturated solution a CaF is 3 86 x 10 5 mho cm and that of wate used for solution is 0 15 x 10 5 The specifi conductance of CaF alone is 2 1 3 71 x 10 5 2 4 01 x 10 5 3 3 7 x 10 4 4 3 86 x 104

A 118 Cd Radionuclide goes through the transformation chain 118 Cd Cd 1 2 30min 118 In t1 2 45 min 118 Sn stable At time t 0 only Cd was present find the fraction of nuclei transformed into stable over 90 minutes

hergy per nucleon vs mass number curve for nuclel 20 fra affer f is shown in the flugre W X Y and Z are four nuclei as indicated on the curve The process that would release energy is 8 5 8 7 5 5 30 N W 60 90 120 1 Y 2 Z 2 W Y Z 3 W 2Y 4 X Y Z A particle is projected in the X Y plane with y axis along menty whit 9 8 5 8 7 5 5 1 X 2 W Y ZX 3 W 2Y 4 X Y Z Z 30 W X Y Z W 60 90 120 uruk AGEM 1 20

one pair e pair 24 36 70 13 0 SC 35 4 only C 3 A C 34 The output Y of the combination of gates shown is equi B 1 A 2 A 3 A B 4 AB In the given si OR AND 1 Mg tan 0 2 2 Mg cot 9 2 Mg cos 8 1 sine 4 None 9 A person who weights elevator that is initially ward to a constant spe the following graphs E 3 ling

AgCl is crystallized from molten AgCl containing a little Cd Cl2 The solid obtained will have anionic vacancies neither cationic nor anionic vacancies cationic vacancies equal to double the number of Cd2 ion S cationic vacancies equal to a number of Cd2 ions incorpo rated

For first A g 3B g 2C g If initial pressure of A Po and after time t from the start of reaction th total pressure is p then the rate constant reaction is given by NCERT Pg 100 1 In STRAGE 2 In 3 the In p p p 5p 4p 4p p 5p

For a hypothetical A 3B P AH 2 x kJ mole of A and M 2Q R AH x kJ mole of M If these reactions are carried simultaneously in a reactor such that temperature is not changing If rate of disappearance of B is y M sec then rate of formation in M sec of Q is 1 3 2 y 3 reaction 3 2 4 3 4 y

The density of KCl is 1 9893 g cm and the length of a side unit cell is 6 29082 A as determined by X rays diffraction The value of vogadro s number calculated from these data is a 6 017 x 1023 b 6 023 x 1023 c 6 03 x 1023 d 6 017x 101

The energy of a radiation of wavelength 8000 A is E and energy of a radiation of wavelength 16000 is E What is the relation between thes two 1 E 6 E 3 E E 2 E 2 E 4 E 2 E 22

12 36 in the given compound In the organic compound CH CH CH CH C CH the pair of hydridised orbitals involved in the formation of C C bond is a sp sp b sp spc sp sp d sp sp on organic compound the Prussian blu

4 1 and 3 are correct 4 54 A hydrocarbon C5H 0 does not react with chlorine in dark 54 Uch Sich C5H 0 3 but gives a single monochoro compound C H Cl in bright sunlight Identify the hydrocarbon 1 2 H C CH CH CH CH 3 CH CH CH CH CH3 4 None of these 55 Select correct statement s 1 SN reactions of 55 CH Cl for 0 F S R H 2 H C CH CH2 CH2 CH3 3 CH CH CH CH CH 4 chifora ediri atas F R A

2 Enthalpy changes in chemical reactions from the data given below 2 g 12 2 HI AH 26 0 kJ 2 s H 12 HI AH 5 0 kJ 2 g AH sublimation of I can be obtained as A 31 kJ C 62 kJ B 62 kJ D 21 kJ

Given Rydberg constant R 105 cm Supposing if electron jumps from M shell to K shell of H atom the frequency of the radiation emitted in cycle s would be 8 1 105 8 3 10 1 2 4 8 13 8 9 1015 1015

The rate constant the activation energy and Arrhenius parameter of a chemical reaction at 25 C are x 10x kJ mol and 2x s 1 Value of rate constant as T is 1 X S 1 2 2x s 1 K A e dt 3 4 10x s 1 8

4 None of these When the value of n is not more than 3 which of the following subshells is not possible to exist 1 2s 2 3s 3 3p 4 2p Rudbarn constant R 105 cm Supposing 14

formed 4 none of the above is formed 63 CH CH CH HI A Bis 1 CH CH CH OH C6 Aq KOH B 2 CH CH CH 2 CH 0 3 CH CH CH 4 CH G CH OH 54 Consider the following statements about S2 reaction 3 4 63 CH CH CH HI A Ag KOH B Be Fon h 3 1 CH CH CH OH 2 CH CH CH 3 CH CH CH OH 64 S 2 34f4fsh41 H FR 4 CH G CH