Physical Chemistry Questions

c no charge The gold numbers of protective colloids A B C and D are 0 04 0 004 10 and 40 respective The protective powers of A B C and D are in the order A A B C D b B A C D C D C A B d D C B A Rist In Brownian motion the paths of the particles are red

64 A gas is found to contain 2 34 g of Nitrogen 5 34 g of oxygen Simplest formula of compound is 1 N O 2 NO 3 N O 4 NO 2

Two liquids A B form an ideal solution What is the vapour pressure of solution containing 2 moles of A and 3 moles of B at 300 K Given At 300 K Vapour pr of pure liquid A P 100 torr Vapour pr of pure liquid torr B Pg 300 1 200 torr 3 180 torr 2 140 torr 4 None of these

8 For an ideal solution with pAP which of the following is 02 to no aki elom ons o true gh to mm 05 at onderong of a XA liquid X4 vapour XA vapour b XA liquid XA liquid XA vapour 193 c d XA liquid and X with each other sdu 201 2018i0022s fonod noitulos Amih ati automaad an do not bear any relationship rob si 1 2 onesned 502 1 4 CF 0 XA vapour vapour Tom

Reaction is Fe SO4 3 BaCl2 BaSO4 FeCl3 How many moles of BaCl is needed to produce mole of FeCl C mole A m B mole m D 2 moles

27 van der Waal s constant a has the dimensions o 1 Mol L 1 2 Atm L2 mol 2 3 Litre mol 1 4 Atm L mol 2

Classify the following into solid liquid and gas Coal kerosene wood oxygen sugar blood water vapour milk wax

A 1 litre container contains 2 moles of PC1 initially If at equilibrium K is found to be 1 the degree of dissociation of PCI is C A 1 C 1 2 B 1 D 50

Cu aq 4NH3 aq Cu NH3 41 aq Overall instability constant for Cu NH3 41 ion shall be 1 2 1 1013 2 7 1013 3 4 7 x 10 14 4 3 10 16

38 The progress of the reaction AnB with time is presented in figure Determine the value of n i ii the equilibrium constant K iii the initial rate of conversion of A 0 5 0 3 0 1 1 3 CAREER INSTITUTE Path to Success KOTA RAJASTHAN 5 O 7 Time Hour

3 Square planar 54 Zero overlap takes place between which of the following if x axis is the inter nuclear axis 1 1s and 2s 3 2p and 2p 2 2p and 2s Li 4 2p and 1s S S CHECE

150 The total number of different kind of buffers obtained during the titration of H PO with NaOH 3 4 2 1 3 2 4 0 are 1 3

Calculate the mass of a photon of sodium light having 5894 and velocity 3x108 ms h 6 6x10 34kg m s 1 wavelength

8 By how much would the oxidizing power of the MnO Mn couple change if the H ions concentratio is decreased 100 times at 25 C A It will increase by 189 mV B It will decrease by 189 mV C It will increase by 19 mV D It will decrease by 19 mV

For reaction A 2B 2C Initially 2 mole of A and B are taken in 10 lit flask at equilibrium 1 mole of C is formed then calculate K for given reaction 1 6 66 2 3 33 3 2 22 4 1 11

What is the energy kJ mol associated with the de excitation of an electron from n 6 ton 2 in He ion a 1 36 10 b 1 36 10 c 1 16 10 d 1 78 x 10

Na amalgam is prepared by electrolysis of NaCl solution using liquid Hg as cathode How long should the current of 10 amp be passed to produce 10 Na atomic mass of Na 23 Hg on a cathode of 10 g Ha

What value of 3 0 M HNO3 can react completely with 15 0g brass 90 Cu and 10 Zn according to equations Cu 4H aq 2NO3 aq 2NO2 g Cu 2H O 4Zn 10H aq NO3 aq NH 4Zn2 3H O Also report what volume of NO gas at 25 C and 1 0 atm will be produced

28 How many gram of CaCO3 be decomposed to produce 20 litre of CO at 750 torr and 27 C

Which of the following ionisation energy order is NOT correct 2 A Cu Cu 2 LOBT Mn 2 Mn C N N D All of the above W 3

The density of 1 M solution of NaCl is 1 0585 g mL The molality of the solution is A 1 0585 B 1 00 C 0 10 D 0 0585 What is the concentration of HCl in the final solution when 65 mL of a 12 M HCl solution is diluted water to a total volume of 0 15 L

51 Which one of the following is expected to exhibit optical isomerism en ethylenediamine a cis Pt NH3 2Cl b trans Pt NH3 2Cl Le cis Co en Cl d trans Co en Cl 2005

How many moles of FeCl3 can be prepared by the reaction of 10g of KMnO4 10 07 mole of FeCl and 500 mL of 3M HCI following the reaction

115 How many milli litre of 0 5 M H SO4 are needed to dissolve 0 5 g of copper II carbonate a 8 10 mL b 16 20 mL c 4 05 mL d 12 05 mLO0

25 AB is rock salt type crystal If radius of At is 75 pm then radius of B will be 1 181 2 pm 3 102 5 pm 2 333 3 pm 4 323 5 pm

Molecular shapes of SF4 CF4 XeF4 are a the same with 2 0 and 1 lone pairs of electrons respectively b the same with 1 1 and 1 lone pairs of electrons respectively c different with 0 1 and 2 lone pairs of electrons respectively d different with 1 0 and 2 lone pairs of electrons respectively

The flocculation value of HCl for arsenic sulphide sol is 30 m mol L If H SO4 is used for the flocculation of arsenic sulphide the amount in grams of H SO4 in 250 ml required for the above purpose is molecular mass of H SO4 98gm mol IPK of CH COOH 4 75

106 07 In Davisson Germer experiment the correct relation between angle of diffraction and glancing angle is Do 90 2 0 90 2 The minimum wavelength in Lyman series is 2 3 0 0 2 4 0 0

39 Listed in the table are forward and reverse rate constants for the reaction 2NO g N g O g Temperature K k M s 1400 1 1 x 10 6 1500 1 4 x 10 5 Is the reaction endothermic or exothermic Explain in terms of kinetics k M s 0 29 1 3

For a first order reaction rate constant is 1 x10 5 sec having E 1800 kJ mol Then value of InA at T 600K is 1 151 7 3 24 7 2 349 3 4 11 34

17 0 75 mole solid A4 and 2 mole O are heated in a sealed bulb to react completely and producing one mole of compound If product formed is also i gaseous state predict the ratio of final pressure a 600 K to initial pressure at 300 K

78 Read the following i When a solution of a weak monoprotic acid is titrated against a strong base at half neutralization 1 point pH pK 2 PK a ii A buffer has maximum buffer capacity when the ratio of salt to acid is 10 iii In a mixture of waek acid and its salt the ratio of concentration of salt to acid is increased ten fold The pH of the solution would Increase by one unit iv An aqueous solution of K SO4 has pH nearly equal to 7 Select the correct code for above B TFTT A TTTT Read the follow 4 C FTFT D FFTT

6 One molecule of haemoglobin will combine with four O molecules If 1 0g of haemoglobin combines with 1 53 mL of oxygen at body temperature 37 C and a pressure of 743 torr what is the molar mass of haemoglobin

When a mixture of NaCl and NaBr is heated with H SO4 the halogen components are liberated as their hydracids leaving Na SO4 as the residue In an experiment the mass of Na SO4 left is equal to the mass of NaCl NaBr taken at the begining of the experiment Calculate the percentages of NaCl and NaBr in the given mixture

The figure shows two paths for the change of state of a gas from A to B The ratio of molar heat capacities in path 1 and path 2 is A 1 0 1 B 1 D Data insufficient

Maximum efficiency of cationic hydrolysis will be shown by 1 Al 3 2 Ga 3 3 Tl 1 4 Tl 3

The freezing point of an aqueous solution of KCN containing 0 1892 mol Kg was 0 74 C On adding 0 095 mol of Hg CN the freezing point of solution was 0 53 C Assuming that complex is formed according to the equation Hg CN mCN Hg CN 2 The value of m is X then what is 2X 3

1 For which of the following electrolytes the graph of Am against gives a negative slope Sodium acetate BY Acetic acid C Ammonium hydroxide D Water dm dm Ac mbc Y Vec C

The acid catalysed hydrolysis of an organic compound A at 303 K has a time for half change of 100 minute when carried out in a buffer solution at pH 5 and 10 minute when carried out at 4 Both times of half change are independent of the initial concentration of A If the rate o pH reaction is given by K A H The value of y is d A dt

When 0 1 M Pb NO3 2 solution is titrated with 0 1 M KI solution then what will be the osmotic pressure in atm of solution when equivalence point is reached at 300 K Take R 0 08 atm L mol k

67 A sample of 16 g charcoal was brought into contact with CH4 gas contained in a vessel of nude 1 litre at 27 C The pressure of gas was found to fall from 760 to 608 torr The density of charcoal sample is 1 6 g cm The volume of the CH gas adsorbed per gram of the adsorbent at 608 torr and 27 C is mL g Assume initially vessel has CH gas only

Hybridisation and magnetic moment of Cu Cu NH are 1 dsp 0 BM 3 sp 0 M 2 dsp 3 BM 4 sp 3 BM

1 Calculate the C H bond energy in methane at 25 C from the data Heat of formation of methane is 17 9 kcal heat of sublimation of carbon is 171 1 cal and heat of formation of hydrogen atoms is 52 1 kcal mol 700 and 393 5 kcal

The number of litres of air required to burn litres of C H is approximately 1 40 2 60 3 80 4 100

25 71 g of chlorine combines with a metal giving 111 g of its chloride The chloride is isomorphous with MgCl2 6H O The atomic mass of the metal is a 20 e 40 b 30 d 69

In Bohr s model of H atom what will be shortes wave lenth in paschen series 1 820 8 nm 3 520 8 nm 2 100 8 nm 4 700 8 nm

Structure of a mixed oxide is cubic close packed ccp The cubic unit cell of mixed oxide is composed of oxide ions One fourth of the tetrahedral voids are occupied by divalent metal A and the octahedral voids are occupied by a monovalent metal B The formula of the oxide is 1 ABO 3 A B O AIPMT Mains 2012 TV 2 Ov x 2 A BO 2 4 AB O 2

Volume of 2M HCl required to neutralise the solution containing 1 mole of NH4Cl and 1 mole of NaOH is a 1 litre b 2 litre c 3 litre d 1 2 litre

The rate constant of a first order reaction at 27 C is 10 min The temperature coefficient of this reaction is 2 What is the rate constant in min at 17 C for this reaction EAMCET 2006 a 10 3 c 2x10 5x104 d 10 2

The solubility product of AgBr at 25 C is 2x10 mol L The solubility of AgBr in 102M solution of CaBr is 1 102 M 2 10 M 3 10 5 M 4 2x10 M