Physical Chemistry Questions

KINDLY PROVIDE A HANDWRITTEN SOLU TION and also explain why water is taken a s solution here volume of solution is taken as 500mL 31 5 g of HNO3 is added to 500 mL of wate r Then choose the correct option s A Strength of the solution is 31 5 g L 1 B Molarity 1 M C Molarity 1 5 M D Strength of the solution is 63 g L 1

70 An aqueous solution is 1 00 molal in KI Which change will cause the vapour pressure of the solution to increase ps pixsh 1 addition of NaCl 2 addition of Na SO4 3 addition of 1 00 molal KI 4 addition of water

Mg s 2Ag 0 0001M E Electrochemistry 1 1 85 V 3 4 65 V cell Mg2 0 130M 2Ag s af E 3 17 V cell 2 2 96 V 4 3 12 V 8 0 0 1

The allowed energy levels for a rigid rotator are given by E 27 J J 1 which can also be expressed in the rotational term F J where F J where B E hc h 8 cl BJ J 1 is the rotational constant and 2hcl J J 1 J J 1 h 8n cl If the bond length in 2C 4N is 117 pm and its force constant is 1630 N m 1 As the molecule rotates more e nergetically with increasing J the c entrifugal force causes the bond to stretch slightly Write down the rot ational energy by taking the centrif

cy 176 If LPG cylinder contains mixture of butane cy and isobutane then the amount of oxygen that would be required for combustion of 1kg of it will be cy 2C4H10 1302 8CO2 10H 0 A 1 8 kg B 2 7 kg C 4 5 kg D 3 58 kg

2 For the following reaction C diamond 0 CO g AH 94 3 kcal C graphite O kcal CO g AH 97 6 The heat required to change 1 g of C diamond C graphite is A 1 59 kcal B 0 1375 kcal D 0 275 kcal C 0 55 kcal

The following plot is drawn for a first order reaction A 2B B concentration 2 0 M 1 2 M 45 time min What is the half life period of the reaction as per the graphical data A 0 56 min B 0 84 min C 1 86 min

Two liquids having vapour pressures P and P in pure state in the ratio of 2 1 are mixed in the molar ratio of 1 2 The ratio of their moles in the vapour state would be 1 1 1 3 2 1 2 1 2 4 3 2

When 5F of charge is passed through CaSO4 aq CuSO aq Al SO molten and Na SO molten then ratio of moles of substances obtained at cathode are 1 1 2 3 3 3 3 2 6 2 1 2 3 4 4 2 3 4 5

Molar solubility of Ni OH in 0 5 M Ca OH is Ksp of Ni OH 2 10 M Options 13 2 10 M 14 2 10 M 2x107 M 16 2 x 10 M 15 Solution Answer 3 NCERT Reference Equilibrium XI part 1 Page No 230

ergy of 2nd excited state of H like sample ximately then the ionisation energy is b 24 eV d 216 eV lotron moving in a 8 Which of the following represents the correct se quantum numbers of a 4d electron a 4 3 2 1 2 b 4 2 1 0 c 4 3 2 1 2 d 4 2 1 1 2 Which of the following statements is are correct f

Rate of Reaction Factors Affecting the Reaction Rate 1 For the reaction N O5 2NO Given and 1 0 02 2 d N O5 dt d NO dt K N O5 K N O5 d 0 K N O5 dt The relation between K K and K3 is 1 2K K 4K3 3 2K 4K K 2 K K K3 4 K 2K 3K3

An element X has two crystalline forms P CsCl type and Q ZnS type zinc blende in which both the positions of cations and anions are occupied by the atoms of element X Identify the correct statement s Ratio of mass of unit cell of P type and of Q type crystalline form is 4 The ratio of packing fraction of P type and Q type crystalline form is 2 approximately The ratio of packing fraction of P type and Q type crystalline form is 4 approximately The ratio of density of P type and Q type crystalline form is 2 approximately

Which mixture of the solutions will lead to the formation of negatively charged colloidal Agl sol Question Type Single Correct Type 1 2 3 4 50 mL of 1 5 M AgNO3 50 mL of 1 5 M KI 50 mL of 1 M AgNO3 50 mL of 2 M KI 50 mL of 2 M AgNO3 50 mL of 1 5 M KI 50 mL of 0 1 M AgNO3 50 mL of 0 1 M KI

Chlorophyll the green colouring matter of plants responsible for photosynthesis contains 2 68 of magnesium by mass How much chlorophyll contain 1 75x1024 magnesium atoms Answer in kilograms O 1 34 kg O 2 16 kg 2 64 kg O 1 45 kg D

7 Select the correct observation in the following isotherm where amount of the adsorbate adsorbed per gram of the adsorbent 1 2 m 3 m X X m x O X Y Pressure P Desorption may start along XY X m 4 All of the above p when point X is reached p along OX

154 When 22 4 litres of H g is mixed with 11 2 litres of Cl g each at S T P the moles of HCI g formed is equal to A 1 mol of HCI g B 2 mol of HCI g C 0 5 mol of HCI g D 1 5 mol of HCI g

Calculate the volume in mL of 25 1 g of a substance with a density of 4 63 g mL enter with correct sig figs I will grade it after the due date as always Your Answer

Medical Chemistry of the following transition neither shows absorption nor emission of energy in case of hydrogen atom 1 3px 3s 3 3s 3dv xy In ground stat 2 3dy 3d z 4 All the abou

Same quantity of current is passed through molten NaCl and molten Al O If 4 6 g of Na was deposited in one cell the mass of Al deposited in other cell is 1 0 9 g 2 1 8 g 3 2 7 g 4 3 6 g

137 At a constant temperature AS will be maximum for which of the following processes A Vaporisation of a pure solvent B Vaporisation of solvent from a solution containing nonvolatile and nonelectrolytic solute in it C Vaporisation of solvent from a solution 14 containing nonvolatile but electrolytic solute in it D Entropy change will be same in all the above cases

13 An energy of 24 6 eV is required to remove o the electrons from a He atom The energy requir remove both the electrons from He atom is a 38 2 eV c 51 8 eV b 49 2 eV d 79 eV

What quantity in mL of a 45 acid solution of a mono protic strong acid must be mixed with a 20 solution of the same acid to produce 800 mL of a 29 875 acid solution Main Online April 9 2017 c 316 d 330 a 320 b 325

Which of the following features is incorrect for phylloclade It shows unlimited growth L Green in colour and photosynthetic in nature Modified fleshy cylindrical structure Has large number of stem thorns

4 On the basis of the following thermochemical data AH 0 H O 1 H aq OH aq AH 57 32 kJ H g O g H O 1 AH 286 20 kJ The value of enthalpy of formation of OH ion at 25 C is

5 60 9875327541 par BEGINNER S BOX 3 The units of solubility product of silver chromate Ag CrO will be 1 mol L 2 mol L 3 mol L 4 mol L

Magnesium reacts with an element X to form an ionic compound If the ground state electronic configuration of X is 1s 2s 2p the simplest formula for this compound is 2018 a Mg X c Mg X b MgX d Mg X

For formic acid HCOOH HCOO H Ka 1 7 10 4 calculate concentration of H ions present in the mixture of 0 1 M HCOOH and 0 05 M HCOONa solutions Question Type Single Correct Type 1 2 3 A 3 4 x 10 4 M 8 5 x 10 5 M 4 1 x 10 3 M

If initially 3M each of CO and H O are present and equilibrium constant Kc 4 the equilibrium concentration of CO gas for the reaction CO g H O g CO g H g is Options 1 M 2 M 3 M 4 M Solution Answer 2

Given EA 0 80 V EMM 2 37 V E 0 34 V Egg 0 79 V Which of the following statement is correct 1 AgNO can be stored in copper vessel 2 Mg NO can not be stored in copper vessel 3 CuCl can be stored in silver vessel 4 HgCl can be stored in copper vessel

Consider a lattice whose plane passing through two opposite edges appears as A B A B B The formula of lattice is AxByC The value of x y z is Answer 0 01 02 03 04 05 06 07 08 09 0 01 02 03 4 05 06 07 9

Column I Compound A Et Me B C D CI Br Br CI Br 1 A p B r C q D p 2 A p B r C q D q 3 A p B r C s D q 4 A r B s C q D q Column II Number of stereoisomers P 2 q 3 r 4 s 6 M45

Match the transformations Column I in column I with appropriate options in column II Column II A CO s CO g Pris p phase transition B CaCO s CaO s CO g a allotropic change X AH is positive C 2H H g D P Prie red solid s t AS is positive AS is negative 201

The correct expression for packing fraction of sodium chloride if the ions along a face are diagonally removed is radius of Nat r radius of Cl r A B C D 13 8 r r 13 16 8 r r 16 3 13 8 r r 13 8 r r

148 For a first order reaction the plot of log C against t logC vs t gives a straight line with slope equal to A k 2 303 C In k 2 303 B k 2 303 R 15

8 Calculate the mole fraction of toluene in phase which is in equilibrium with a solution o benzene and toluene having a mole fraction o toluene 0 5 The vapour pressure of pure Benzene is 119 torr and that of toluene is 37 torr at the same temperature 1 0 5 2 0 75 3 0 625

Which of the following combinations will make a buffer solutions i CH COONa 2 mol HCl 1 mol iii CH COOH 1 mol CH COONa 1 mol 1 i 2 H ii CH COOH 2 mol NaOH 1 mol 3 0 0 4 i ii

2 18 A simple harmonic motion having an amplitude A and time period T is represented by the equation y 5 sin 2n t 4x m Then the values of A in m and T in sec are a A 5 T 2 b A 10 T 1 c A 5 T 1

For the reaction 2NO g N O g AH 57 2 kJ mol 1 The value of K can be increased by C Options Adding NO Adding N O4 Increasing temperature Decreasing temperature Solution

Consider the lons given below along with their size w 100 pm P x 150 pm y 200 pm Identify the incorrect statement O The solid wR undergo Frenkel defect The solid yP undergo Frenkel defect O The solid xP undergo Schottky defect O The solid xQ undergo Schottky defect R 200 pm 300 pm 350 pm

The wave number of the spectral line in the emission spectrum of hydrogen will be equal to 8 9 times the rydberg constant if the electron jumps from a n 3 to n 1 b n 10 to n 1 c n 9 to n 1 d n 2 ton 1

he conductivity of a saturated solution of AgCl is 9 x 10 6 sm and its molar conductivity at infinite dilution is 3 1 p of AgCl is A B 9 10 10 4 32 x 10 18 1 8 10 9 X 5 10 16

Zero Marks Negative Marks 1 If wrong option is selected If a solution of stearic acid C18H3602 M 284 in benzene contains 1 42 gm acid per L When this solution 100 L is dropped on surface C6H6 gets evaporated and acid forms a unimolecular layer on the surface If it covers an area 6020 cm with unimolecular film Find the area covered by one molecule of acid NA 6 02 x 10 3 O 2x 10 20 cm 4 x 10 20 cm O 2 1020 cm 0 If none of the option is selected O 4 1020 cm

Reaction AB carried out inside a container Concentration varies as Ct a bt Rate of reaction can be expressed in term of pressure at temperature T 300 K 1 Take b 4 R atm mol k 12 Give your Answer divide by 10

No of mole of KMnO4 needed to react with 1 mole of SO ion in acidic medium is 2 5 NO NH The equivalent mass of NO ion is 7 75 g eq 2N H O solution is same as that of 1M H O2 solution in its reactions with KMnO4 Amount of NaOH required to neutralize completely 100mL of 0 15N N O5 is 0 6g

2 In a mixture of 0 1 M AgNO3 and 0 1 M Pb NO3 2 solution 0 1 M KCl solution is added dropwise to precipitate AgCl When precipitation of PbCl just starts what is the concentration of Ag in the solution Given solubility product LAgCI 1 5 10 0 LPbc12 2 4 10

A non volatile solute A dissolved in water undergoes partial association as per the following reaction nA A If van t Hoff factor is found to be 0 75 select the correct option s for n and degree of polymerisation a n 2a n 2 1 2 n 2a n 3d 3

An element atomic mass 100 g mole having BCC structure has unit cell edge 400 pm The density of the element is no of atoms in BCC Z 2 uch dra 31fuach R 100 g mole for BCC pm 2 FREAT 400 34 BCC Z THY H O O O iffa A 2 144 g cm B 5 2 g cm C 7 289 g cm D 10 376 g cm

Edge length of M X fcc structure is 7 2 Assuming M X contact along the cell edge radius of X ion is M 1 6A M X fcc 7 2 M X go X 3 A 2 0 B 5 6 C 2 8 D 38 Your Answer R fua f M 1 6

4 Very weak metallic bond 54 Calculate the equilirium constant for the reaction Fe 2 Cet Fe Ce Given Ee C 3 1 44 V E2 0 68V 2 303RT F 0 06 at 25 C log 4 68 0 67 1 K 5 x 108 2 K 4 68 x 10 2 3 K 2 x 104 4 None 76 06 12 6 54 fe Fe f Cath 1 44 62 76 19 6 Kc C 2