Physical Chemistry Questions

164 If wavelength of an electron in the 2nd orbit of hydrogen is x then circumference of the 5th orbit of the same species will be 1 25 x 2 12 5 x 4 x 35 x Oxidation electrode potential of chlorine electrode is maximum

1 14 a Ar 3d 0 4s 4p c Ar 3d 4s 4p Which of the following electronic configurations corresponds to the element with the highest electron affinity 10 Submit 30 b Ar 3d d Ar 3d 04s 4p 4s 4p

1 A B 07 2 A8B6O7 3 AgBgO7 A6B8O6 2 What happens when 2 butyne reacts with H in presence of Nickel Boride or Lindlar s catalyst Pd CaCO3 PbO CH C CH 11 CH C CH 1 2 CH C H 11 H C CH 0000 17 3 CH CH CH CH 4 CH CH IT TC 10 COL CH CH

3 34 2 g 4 136 8 g 8g of NaOH is dissolved in 18g of H O Mole fraction of NaOH in solution and molality in mol kg of the solutions respectively are JEE Main Online 2019 1 0 167 11 11 4 0 167 22 20 2 0 2 22 20 3 0 2 11 11

3 p nitrophenol p methylphenol p methoxyphenol 4 p methoxyphenol p methylphenol p nitrophenol 87 Consider the following compounds CH COCI ii ON O COCI m H C iv OHC The correct decreasing order of their reactivity towards hydrolysis is 1 i ii iii iv 2 iv ii i iii COCI COCI 3 ii iv i iii 4 ii iv

1 13 6 6 8 8 4 eV 2 13 6 10 2 3 4 e 3 13 6 40 8 eV 4 13 6 3 4 A sample of milk splits after 60 min at 300 K and after 40 min at 400 K when the population of lactobacillus acidophilus in it doubles The activation energy in kJ mol for this process is closest to Given R 8 3J mol K In 0 4 e 4 0 1 39 8 2 19 9 3 3 98 4 7 96

A B C Piston A Fresh water A SPM Piston B Concentrated sodium chloride solution in water B Water will move from side A to side B if a pressure lower than osmotic pressure is applied on piston B Water will move from side B to side A if a pressure greater than osmotic pressure is applied on piston B Water will move from side B to side A if a pressure equal to osmotic pressure is applied on piston B

If the ionic radii of K and F are about 1 34 each then the expected values of atomic radii of K and F sho be respectively A 2 31 and 1 34 B 2 31 and 0 64 C 0 64 and 2 31 D 1 34 and 1 34

Two gases A and B having the same volume diffuse through a porous partition in 20 and 10 seconds respectively The molecular mass of A is 49 u Molecular mass of B will be AIPMT Prelims 2011 1 25 00 u 2 50 00 u

The Rate constant of a first order reaction A 2B C varies with time as k 3t 1 If the initial concentration of A was 10 mol lit and the reaction ra depends on A what is the approximate concentration of A at t 3s 1 10 mol lit 2 10 mol lit 3 10 mol lit 4 10 5 mol lit

The coagulation values in millimoles per litre of the electrolyte used for the coagulation of As283 ar given below I NaCl 52 II BaCl 0 69 III MgSO4 0 22 The correct order of the coagulation power is 1 I II III 2 II I III 3 III II I 4 III I II

If 40 ml of N reacts with 60 ml of H to form NH3 and if 10 ml of NH3 is produced then find percentage yield in the reaction Question Type Single Correct Type 1 2 3 10 25 50

Za dustX CHCY 70 Consider the following reaction Phenol product z is 1 benzaldehyde 2 benzoic acid 71 Coordination number of Ni in Ni C O is 3 4 3 benzene AlkalineKMOZ 1 3 2 6 72 Electrolytic reduction of nitrobenzene in weakly acidic medium gives 4 toluene 4 2 H O the

1 Teflon 2 Natural rubber 75 Gammexane is 1 bromobenzene 2 benzyl chloride 3 chlorobenzene 4 benzene hexachloride 76 An organic compound contains carbon hydrogen and oxygen Its elemental analsysis gave C 38 71 and H 9 67 The empirical formula of the compound would be 1 CHO 2 CH 0 3 CH 0 3 styrene 4 Nylon 6 6 4 CH 0

A radioactive isotope having a half life of 3 days was received after 12 days It was found that there were 3 gm of the isotope in the container The initial mass of the isotope in gm when container was packed

EMISTRY 1 Oxygen atom forms FCC unit cell with A atoms occupying all tetrahedral voids and B atoms occupying all octahedral voids If atoms are removed from two of the body diagonals then determine the formula of resultant compound formed 1 A4B407 2 AsB607 3 A BSO7 4 A6B8O6

For the following endothermic reaction A g B g C g This reaction is Select one spontaneous at all temperatures non spontaneous at all temperatures spontaneous only at low temperatures spontaneous only at high temperatures

4 None of these 32 For the zero order reaction A B C initial concentration 32 A B C A 0 1 M of A is 0 1 M If A 0 08 M after 10 minutes then it s half life and completion time are respectively 1 10 min 20 min 2 2x 10 3 min 4 10 min 3 25 min 50 min 4 250 min 500 min 3 0 4 M 0 6 M 4 A 0 0 0 07 10 ff of 1 10 min 20 min 2 2 x 10 3 min 4 x 103 min 3 25 min 50 min X 4 250 min 500 min ats is not correct for the 33 fanforfit f A 0 08 M M 844 0 06 22 Da 643 VID us A Bre 0 1 0 1 to n n goog 22

3 226 4 g mol 4 445 9 g mol 9 Which of the following aqueous solution have highest freezing point 1 0 1 m NaCl 3 0 2 m Sucrose INCERT Pg 58 2 0 3 m Na SO4 4 0 1 m urea

Consider the following equations 2Fe H O xA yB in basic medium 2MnO4 6H 5H O x C y D z E in acidic medium The sum of the x y x y and z Ometric coefficients products A B C D and E

1 In bromoethane and chloroethane mixture intermolecular interactions of A A and B B type are nearly the same as A B type interactions II In ethanol and acetone mixture A A or B B type intermolecular interactions are stronger than A B type interactions III In chloroform and acetone mixture A A or B B type intermolecular interactions are weaker than A B type interactions A B C D Solution II and III will follow Raoult s law Solution 1 will follow Raoult s law Solution II will show negative deviation from Raoult s law Solution III will show positive deviation from Raoult s law

8 The major product during hydroboration oxidation of 1 methylcyclopentene is CH CH CH 1 2 9 For the reaction N 3H 2NH3 CH OH 3 AAJ KA TOPPER OH

What is the Keg of the following reaction NaCN r t 0 17 Cl b 017 CN AG 0 010 kJ mol c 17 d 0 01

OH 1 2 3 9 For the reaction N 3H 2NH3 AAJ KA TOPPER The rate of change of concentration for hydrogen is 0 3 x 10 Ms The rate of change of concentration of ammonia is 1 0 2 x 104 Ms 2 0 2 x 10 Ms 3 0 1 x 10 Ms 4 0 3 x 10 Ms OH

If the acid base reaction HA aq B aq HB aq A aq has a K 104 which of the following statements are true i HB is stronger acid than HA ii HA and HB have the same acidity v A is stronger base than B ii HA is stronger acid than HB iv B is stronger base than A vi B and HB are conjugate acid base pair D iv v vi vii the acid and base strengths connot be compared A i iii v B i v vi C ii iv vi

During electrolysis of aqueous NaOH 4g of O gas is liberated at NTP at anode H gas liberated at cathode is CBSE PMT 1998 a 2 8 litres 112 litres b 5 6 litres d 22 4 litres

The correct order of temperature of a real gas is 1 Boyle s temperature II Critical temperature III Inversion temperature 1 III I II 2 I II III 3 II 1 III 4 I III II

A buffer solution is made by mixing a weak acid HA K 10 6 with its salt NaA in equal amounts What should be the amount of acid or salt that should be added to make 90 ml of buffer solution of buffer capacity 0 1 1 10 milli moles 2 22 milli moles 3 9 milli moles 4 11 milli moles

The value of DH for the reaction below is 128 1 kl CH OH 1 CO g 2H g How many k of heat are consumed when 5 10 g of CO is formed as shown in the equation Select one O a 62 0 X Ob 162 O c 0 182 O d 23 3 O e 8 31

85 Which chloro derivative of benzene among the following would undergo hydrolysis most readily with aqueous sodium hydroxide to furnish the corresponding hydroxyl derivative NO 2 0 N 3 Me N CI 4 C H CI

4 CO carboxyhaemoglobin is carried in 4 0 20 M haemoglobin as 89 A cell is placed in 0 4 M solution of sugar and no change in volume of cell is found What is the concentration of the cell sap 1 40 M 2 4 M 3 0 4 M

The correct increasing order of basic strength for the following compounds is NH NH NH 1 3 1 2 NO CH 2 3 2 1 3 2 1 3 4 2 3 1

An acid base indicator which is a weak acid has a pka value 5 45 At what cocentration ratio of sodiumacetate to acetic acid would the indicator show a colour half way between those of its acid and conjugate base forms pka of acetic acid 4 75 log 2 0 3 1 4 1 2 7 1 3 5 1 4 2 1

The ionization constant of NH in water is 5 6 10 10 at 25 C The rate constant for the reaction of NH and OH to form NH3 and H O is 3 4 x 10 0 lit mol sec at 25 C The rate constant for the proton transfer from water to NH3 in lit mol sec is 1 1 6 07 105 2 6 07 10 5 3 6 07 x 10 4 6 07 x 10 3

The redox reaction among the following is JEE Main 2020 1 Reaction of Co H O Cl3 with AgNO3 2 Formation of ozone from atmospheric oxygen in the presence of sunlight 3 Combination of dinitrogen with dioxygen at 2000 K 4 Reaction of H SO with NaOH

certain weak acid has a dissociation constant 0 x 104 The equilibrium constant for its reaction ith a strong base is A 1 0 x 10 4 B C 10 1 0 x 101 Your Answer 1 x 10 0 Correct Answer

An ideal gas absorbs 2000 cals of heat from a heat reservoir and does mechanical work equivalent 4200 J The change in internal energy of the gas is 1 3000 cals 2 2000 cals 3 1500 cals 4 1000 cals

1 For a hypothetical hydrogen like atom the potential energy of the system is given by U r where r is the distance between the two particles If Bohr s model of quantization of angular momentum is applicable then velocity of particle is given by 1 V 2 V 3 V Ke 87 m 24 Ke m 8Ke m 4 V 24 Ke n m Ke

For a reaction activation energy E 0 and the rate constant at 200 K is 1 6 x 106 s 1 The rate constant at 400 K will be Given that gas constant R 8 314 J K 1 mol NEET 2019 Odisha 1 3 2 x 106 s 1 2 3 2 x 104 S 1 3 1 6 x 106 S 1 4 16 x 103 S 1

The rechargeable lithium ion battery has been developed in Japan The standard electromotive force of the battery is 3 70 V Assume that the reaction at the cathode and anode are when battery is working Cathode CoO Li 1e LiC00 Anode LiC6 6C Li e Electrodes consist of LiCoO2 and graphite The mass of graphite electrode in completely charged state and that in completely discharged state are X g and Y g while 9 8 g of LiCoO2 and 10 g of graphite are present initially Then 10 X Y is Molar mass of Co and Li are 59 and 7 g mol respectively

A buffer solution is made by mixing a weak acid HA K 106 with its salt NaA in equal amounts What should be the amount of acid or salt that should be added to make 90 ml of buffer solution of buffer capacity 0 1 1 10 milli moles 2 22 milli moles 3 9 milli moles 4 11 milli moles

Statement l 100 ml of 1M NH OH 100 ml of 1M HCI acts like a basic buffer Statement II Ammonium acetate undergoes both cationic and anionic hydrolysis A I and II are true B I is true Il is false C I is false Il is true D I and II are false

Which of the following is a buffer solution AT 500 ml of 0 1 N CH COOH 500 mL of 0 1 N NaOH 500 ml of 0 1 N CH COOH 500 mL of 0 1 N HCI 500 ml of 0 1 N CH COOH 500 mL of 0 2 N NaOH 500 ml of 0 2 N CH COOH 500 mL of 0 1 N NaOH

A compound X upon reaction with H O produces a colorless gas Y with rotton fish smell Gas Y is absorbed in a solution of CuSO4 to give Cua P as one of the products Predict the compound X 1 CazP 2 NH CL 3 As2O3 4 Ca3 PO4 2 124 2 3 4 128 WE 1 2 3

Consider the following reduction processes Zn 2e Zn s E 0 76 V Ca 2e Ca s E 2 87 V Mg2 2e Mg s E 2 36 V Ni2 2e Ni s E 0 25 V The reducing power of the metals increases in the order JEE Main 2019 1 Ca Mg Zn Ni 2 Ni Zn Mg Ca 3 Ca Zn Mg Ni

3 2 The formal potential of Fe Fe in a sulphuric acid and phosphoric acid mixture E 0 61 V is much lower than the standard potential E 0 77 V This is due to i formation of the species FeHPO4 ii lowering of potential upon complexation iii formation of the species FeSO4 iv high acidity of the medium a i and ii only c iii only b i ii and iv only d all of these

1 Libermannnitroso test 2 Neutral FeCl solution 4 all of the above 3 Bromine water A balloon weighing 50kg is filled with 685 2 kg of helium at 1 atm pressure and 25 What wil pay load if it displaced 5108 kg of air 1 4372 8 kg 2 4422 8kg 3 5793 2 kg 4 5843 2 kg The number of isomers for the compound with molecular formula C BrCIFI is

In one litre container ethyl acetate is formed by the reaction between ethanol and acetic acid and the equilibrium is represented as CH COOH 1 C H OH CH COOC H 1 H O 1 At 293 K if one starts with 1 00 mole of acetic acid and 0 18 mole of ethanol there is 0 171 mole of ethyl acetate in the final equilibrium mixture Calculate the equilibrium constant 4 K 6 23 1 K 3 92 2 K 2 56 3 K 4 89

The indicator constant of phenolphthalein is approximately 10 10 A solution is prepared by adding 100 01c c of 0 01 N sodium hydroxide to 100 00 c c of 0 01N hydrochloric acid If a few drops of phenolphthalein are now added what fraction of the indicator is converted to its coloured form 1 2 3 2 4 3 17 12 2 9 4 11

How many milliliters of 0 200 M FeCl are needed to react with an excess of Na S to produce 1 04 g of Fe S if the product yield for the reaction is 60 A 50 mL B 72 mL C 83 mL D 96 mL f Nations