Physical Chemistry Questions

Electrons are filled in orbitals following Aufbau Principle Pauli s Exclusion Principle and Hund s Principle Quantum number are assigned to get complete information of electrons regarding their energy angular momentum etc d a s Gum 340g far dacia af 3 fuqia Aun a gue Meld xgar vi gial Fich Gui tuna H n f qui Gh rt ua B H Which of the following set of orbitals are arranged in correct energy order A 3p 3s 2p in He B 3px 3s 2p in H C 4p 4p 4p in He D 4px 4py 4p 4s 4dxy in H

7 The rate law for reaction A B C Dis rate K A 2 B 2 If the reaction starts from 1M initial concentration for both A and B then the time taken for 7 4 300 J A B C Dat K A B 1 feff IMA 0 25 M K 2 303 x 10 sec concentration of A to be reduced to 0 25 M will be K 2 303 x 10 sec 1 300 sec 2 600 sec 1 300 sec 3 900 sec 4 1200 sec 3 900 sec If bond enthalpies of N N H H and N H bonds are x N N HAN 2 600 sec 4 1200 sec

Solvelancer Test In a water sample if the COD value for water sample is 4 ppm then this water is SolveLancer Test a Pure water b c d None of the above Polluted water Cannot be determined

3 The solubility product of CuS Ag2S and H are 1031 104 and 10 54 respectively Th solubilities of these sulphides are in the orde a HgS Ag S CuS b CuS Ag S HgS c Ag S CuS HgS d AgS HgS CuS 1997 4 The equilibrium constant for the reaction N 3H ONLL

The gold number of A B C and D sols are 0 002 0 08 12 and 48 respectively The protecting power of sols in the order of A B C D A B C D A B C D A B C D

10 95 According to Le Chatelier s principle adding heat to a solid and liquid in equilibrium will cause the 991 tot a temperature to increase b temperature to decrease c amount of liquid to decrease d amount of solid to decrease 96 0 1 M solution of which one of these substances 1993

A female who is carrier for haemophilia marries a normal male then All offsprings are haemophilic All daughters are haemophilic hr min Only 50 percent of sons are haemophilic 50 percent of daughters and 50 percent of sons are haemophilic

A colourblind male marries a normal female whose fathe was colourblind What percent of their daughters will be colourblind 25 50 75 Zero

Chemistry Section A B If a gas absorbs 200 J of heat and expands by 500 cm 3 6 fe 2002 x 10 Nm 2 from against a constant pressure 2 x 10 Nm2 then change in f 500 cm af dt make a Internal energy is 1 300 J 2 100 3 100 J 4 300 J The rate law for reaction A B C Dis rate K A11 2 B 2 If the reaction aftada t 1 300 J 2 100 J 3 100 J 4 300 J 7 ff A B C D fant

Which type s of colloids is are correctly matched Multimolecular colloids Gold sols Macromolecular colloids Proteins Associated colloids Soap and detergent All of these

Sickle cell anaemia Is an X linked recessive disorder Causes accumulation of phenylalanine in brain Is caused by transversion of gene controlling B chain of haemoglobin Is a chromosomal disorder

Air is compressed in a vertical cylinder by weight of piston When a weight is added to the Piston the volume of the gas decreases from 500 mL to 400 mL If another weight of same magnitude is added the volume of the gas will decreases 2nd decrease by Assume ideal behaviour A another 100 mL B less than 100 mL C more than 100 mL D Insufficient Information

A certain amount of ideal gas present in a uniform piston fitted cylinder is allowed to expand under reversible isothermal conditions to a final state deliver some work on the surrounding The height of piston before after expansion were 10 cm 50 cm respectively By what distance the piston will be required to move in upward direction so hat half of the work of the previous process id delivered in m

41 When copper metal is treated with dilute nitric acid copper II nitrate and nitric oxide forms Find the coefficient of copper II nitrate in the balanced equation of this reaction A 2 B 4 C 1 D 3

A teacher wanted to give acid base titration to her students For that she prepared 1 HCI solution by dissolving 73 g of hydrochloric acid in one litre of water and ii sodium hydroxide solution by dissolving 0 46 g of sodium metal in one litre of water Find the volume of the hydrochloric acid solution required for complete neutralization of sodium hydroxide solution A 5 mL C 20 ml B 10 mL D 46 mL

SolveLancer Test 4 4 g of polymer having carboxylic group is titrated with NaOH and requires 11 mL of 0 02 M NaOH Calculate average molar mass of Polymer g mol SolveLancer Test a 1 0 x 104 b 20 x 10 c 0 2 x 10 d 2 x 104

4 Lithium has a bcc structure Its density is 530 kg m 3 and its atomic mass is 6 94 g mol Calculate the edge length of a unit cell of lithium metal N 6 02 1023 mol a 527 pm b 264 pm c 154 pm d 352 pm NEET I 2016

If according to De Broglie electron moves in a specific orbit like a wave and centripetal f orce only works when a object is moving in circlular path then how is the electron held i n the orbit knowing that according to uncert ainty principle it cannot exist in nucleus Nucleus r I

When electromagnetic radiation of wavelength 310 nm fall on the surface of Sodium electrons are emitted with K E 1 5 eV Determine the work function W of Sodium A 2 5 eV B 5 eV C 10 eV D 12 5 eV

11 2 ml of methane gas is produced at STP by the action of 41 2 mg of alcohol ROH with methyl magnesium iodide CH3Mgl The molecular mass of alcohol is Options 1 16 0 2 41 2 3 84 2

Column l contains some electrochemical reactions and column Il contains their characteristics Column l Q1 2Fe Zn E 0 77 V E Q2 M Ag 0 73 V E 2Fe Zn 20 2 M Ag Ag Ag 0 76 V 0 8V Q3 2H Sn H Sn E S S Q4 Ag Ou Ag Cu E Ag Ag 0 13 V 0 8 V Eriou 0 54 V Column Il A1 E 1 53 V A2 E 0 26 V A3 AG 295290 J A4 AG 25090 J A5 Spontaneous reaction

2 One mole of N H loses 10 mole of electrons to form a new compound y Assuming that all he nitrogen appears in the new compound what is the oxidation state of N in y There is no change in the oxidation state of H A 1 B 3 C 3 D 5

Two mya the man like primate who walked in east African grasslands and essentially ate fruits was O Homo erectus O Cro magnon man O Neanderthal man

4 AH 0 and AS 0 53 For N O NO NO if total pressure is P atm and amount of dissociation is 50 the value of K will be 1 3P 2 2P 4 3 Match the column 3 AH 0 AS O 4 AH 0AS O 53 3N O NO NO afeg faci 50 K 1 3P 2 2P 3 54 aas 4

48 For the cell reaction 2Ce Co2Ce Co Eo cell is 1 89V and Eco co 0 28 If Ece Ce 1 1 64 V 2 1 64 M 3 2 08 V 4 2 17 V HO 48 les were allowed to react The 49 1 2 3 4 10

58 If rate of reaction in by a factor of 2 when temperature is raised from 27 C to 37 C What is the value of activation energy in kJ mol By what factor does rate of reaction increased from 127 C to 137 C increase if temperature is Cherr Given In2 0 7 R 8 314 Joule mol K e0 4 1 5 a If temperature coefficient u is same in given temperature range b If temperature coefficient u is function of temperature

7 The stoichiometric point of the titration of 25 0 mL 0 100 M HCIO with 0 10 M NaOH a H aq occurs when the molar concentration of NaClO is 0 050 M The pH of this solution is about given pKa of HCIO 7 43 log 0 05 1 301 A 2 63 C 10 10 B D 3 94 11 36

4 The mean lives of a radioactive substance are 1620 year and 405 year for alpha emission and beta emission respectively what the time during which th of a sample will decay if it is decaying both by alpha emission and beta emission simultaneously W A 470 45 year B 449 24 year C 269 57 year D 345 56 year O A B O C D

One of the hazards of nuclear explosion is the generation of Sr9 0 and its subsequent incorporation in Expo bones This nucleide has a half life of 30 year Suppose one microgram was absorbed by a new born child how much Sr will remain in his bones after 20 years Take log 1 6 2 log 2 3

5 In order to find the strength of a sample of sulphuric acid 10 g was diluted with water and a piece of marble weighing 7 g placed in it When all action had ceased the marble was removed washed dried and was found to weigh 2 2 What was the percentage strength of sulphuric acid

Iron ores are dressed by Froth floatation process Magnetic separation Hand picking All of the above

Which of the following are arranged in increasing order of solubility Option A B CaCO3 KHCO3 NaHCO3 C NaHCO3 KHCO3 CaCO3 C KHCO3 NaHCO3 CaCO3 CaCO3 NaHCO3 KHCO3

For a reaction A B enthalpy 18 4 2 kJ mol 1 and enthalpy of activation is 9 6 kJ mol 1 The correct potential energy profile for the reaction is shown in option 1 2 X 4 PE PE A Reaction Progress PE A B Reaction Progress B PE A B A Reaction Progress B

The standard reduction potentials for the two half cell reactions are given below Cd2 aq 2e Cd s E 0 40 V Ag aq e Ag s E The standard free energy change for the reaction 2Ag aq Cd s 2Ag s Cd is given by A 115 8 kJ B 115 8 Kj C 231 6 kJ D 231 6 Kj 0 80V

Two liquids A and B form ideal solutions At 300 K the vapour pressure of a solution containing 1 mole of A and 3 moles of B is 550 mm Hg At the same temperature if one more mole of B is added to this solution the vapour pressure of the solution increases by 10 mm Hg The vapour pressures of A and B in their pure states are respectively a PA 600 mm Hg and pg 400 mm Hg b p 550 mm Hg and pe 560 mm Hg c PA 450 mm Hg and pe 650 mm Hg d p 400 mm Hg and pg 600 mm Hg B

D Consider the reaction A B The concentration of both the reactants and the products varies exponentially with time Which of the following figures correctly describes the change in concentration of reactants and products with time B B a c Concentration Concentration Time B Time A 4 b d Concentration Concentration Time Time 4 4 B

A and B combined to form four different compound P Q R S The following reaction take place in the formation of P Q R S 0 6 g A 0 8g B 1 4 g P 9 0 g A 24 0 g B 33 0 g Q 40 0 g A 160 0 g B 200 0 g R 18 0 g A 96g B 114 g S Which law of chemical combination is followed

When acetone and chloroform are mixed together hydrogen bonds are formed between them Which of the following statements is correct about the solution made by mixing acetone and chloroform a On mixing acetone and chloroform will form an ideal solution b On mixing acetone and chloroform positive deviation is shown since the vapour pressure increases On mixing acetone and chloroform negative deviation is shown since there is decrease in vapour pressure d At a specific composition acetone and chloroform will form minimum boiling azeotrope

ZnS exists in two crystalline structures i Zinc blende and ii Wurtzite Mark the correct statement about their structures a In zinc blende S2 ions are arranged in ccp while Zn occupy half of the tetrahedral sites In zinc blende S ions are arranged in hcp and Zn ions occupy all octahedral voids b c 2 In Wurtzite structure S ions are arranged in ccp and Zn ions occupy half of tetrahedral voids 2 d In Wurtzite structures S2 ions are in hcp arrangement and Zn ions are occupying all octahedral voids

Electrode potential for Mg electrode varies according to the equation 1 Mg Mg 2 log 2 Mg The graph of EMg2 Mg vs log Mg is EMg Mg a c EMg2 Mg EMg2 Mg E log Mg2 0 059 log Mg 1 b d EMg2 Mg EMg2 Mg log Mg2 Ing Mg 1

1 what is the freezing point of a solution prepared by dissolving 1 00 mol of hf in 500 gram water is 3 8 c ii The Freezing point of a Solution of 1 00 mol Hcl In 500gr Water Is 7 4 c Calculate I In Both Cases And Point Out a Difference Between Hcl And HF Based On The Calculation

The decomposition of N O according to the equation 2N O5 g 4NO2 g O2 g is a first order reaction After 30 minutes from the start of the reaction in a closed vessel the total pressure developed is found to be 305 5 mm of Hg and on complete decomposition the total pressure is 587 5 mm Hg If the rate constant of reaction is xx 10 3 then the value of x is

Which of the following helps in flocculation of lyophobic colloids O By adding opposite charge electrolyte O Electrophoresis Continuous dialysis O All of these

3 1 7 Which of the following buffers containing NH OH NH CI 64 NH OHNH C nt has the highest pH value conc of NH OH mol L 1 0 50 2 0 10 3 0 50 4 0 50 conc of NHA mol L 0 50 0 50 1 50 0 10 2 2 conc of NH OH mol L 1 0 50 2 0 10 3 0 50 4 0 50 conc of NH Cl mol L 0 50 0 50 1 50 0 10

So here let x y now and got Y 6 so X 6 Correct teacher 9 Hydrocarbon P on complete combustion produce x mol of CO and y mol of H O and x 2y 1 mol of F complete combustion required 7 5 mol of oxygen O and P contain only C and H The number of ma carbon atom in 1 mol of P are mal formula C H O is

Your spaceship will launch toward the Marti an orbit at the exact time when Earth align it self to Mars While Earth takes 365 4 days to orbit around the sun Mars takes 687 day s If both the planets aligned with each othe r 700 days ago then in how many days will t he planet align again

25 Oxidation of succinate ion produces ethylene and carbon dioxide gases On passing 0 2 Faraday electricity through an aqueous solution of potassium succinate the total volume of gases at both cathode and anode at STP 1 atm and 273 K is a 8 96 L c 6 72 L b 4 48 L d 2 24 L JEE Main

28 90 Mark for Review Choose the correct option among the following O Lyophilic sols are reversible sols O Lyophilic sols are more stable than lyophobic sols All of these hr r O Lyophilic colloids are used to protect lyophobic colloids

According to Freundlich adsorption isotherm which of the following correct at low pressure of adsorption O E 8 x E 8 p hr m O XxP

When the Bayer s process is used for recovering aluminium from siliceous ores some aluminium is always lost because of the formation of an unworkable mud having the following average formula 3Na O 3Al O 5SIO SH O Since alu minium and sodium ions are always in excess in the solution from which this precipitate is formed the precipitation of the silicon in the mud is complete A certain ore contains 13 by weight Kaolin ALO 2SiO 2H 0 and 87 gibbsite ALO 3H O Al 27 SI 28 10 What per cent of the total aluminium in this ore is 12 How many moles of AI O are present per mole of recoverable in the Bayer s process ore a 80 c 85 b 90 d 75 11 What is the percentage of silica present in the ore by weight a 2 82 c 46 5 b 3 02 d 6 05 a 1 000 c 0 222 b 0 083 d 0 242