General Questions and Answers

produced by the passage of 4F electricity Calculate the cell potential in V if AG 96 5 kJ mol and n 1 If K for the reaction Cu2 aq Sn2 aq 4 Sn aq Cu s at 25 C is represented as 2 6 x 10 then find the value of y Given Eu C 0 34 V Es Sn4 Sn 0 15 V If AG for the half cell MnO4 MnO2 in an acid solution is xF then find the value of Given E O MnO4 Mn2 1 5 V E MnO 2 Mn2 1 25 V If the equilibrium constant for the reaction Cd aq 4NH3 aq Cd NH3 aq i then find the value of x Given Eca cd 0 4 V E Cd NH3 2 Cd 0 61V

For the metallurgical process which combination of ores are calcined and can further be reduced by carbon O Haematite and iron pyrites O Haematite and calamine O Calamine and sphalerite O Sphalerite and iron pyrites

generates photoelectrons of velocity 6x105 ms from it Mass of electron 9 10 kg Velocity of light 3 10ms Planck s constant 6 626 10 34 Js Charge of electron 1 6 10 19 JeV a 0 9 eV b 3 1 eV c 2 1 eV d 4 0 eV Main Jan 12 2019 1

Total number of structural unsaturated 3 alcohols possible with molecular formula C6H12O is aga Cat20ger foxat en s Enter your answer Type your answer here

25 A 0 96 g sample of Fe O3 solid of 50 purity is dissolved in acid and completely reduced by heating the solution with zinc dust The resultant solution is cooled and made upto 100 0 mL An aliquot of 25 0 mL of this solution requires 30 mL of 0 01 M solution of an for titration Calculate the number of moles of electrons taken up by 1 mol of oxidising agent in the reaction of the above titration noxidising agent m

The Lassaigne s extract is boiled with conc HNO3 while testing for the halogens By doing so it B decomposes Na S and NaCN if formed helps in the precipitation of AgCl increases the solubility product of AgCl increases the concentration of NO ions

What will be compound C and F respectively Cl hv Alcoholic CH3 CH CH3 B KOH F Na dry ether E Br A Mono chlorinated HBr 2 eq H O D O CH CH CH and O CH CH CH and Br Na dry ether O CH3 CH CH Br and CH3 CH CH Br and NBS N bromo succinamide C Mono brominated Br Br

1 The molality of a urea solution in which 0 0200 g of urea NH CONH is added to 0 400 dm of water at STP is 1 0 555 mol kg 1 3 8 33 104 mol kg 2 5 55 104 mol kg 1 4 33 3 mol kg

Chlorine atom has two naturally occurring isotopes 35Cl and 37CI with respective molar abundance of 75 and 25 Which of the following is are correct for Cl2 molecules A There are three types of Cl2 molecules on the basis of molecular mass B Average molar mass of Cl2 is 72 g mol C In a Cl2 sample molar abundance of the heaviest possible Cl molecule is 6 25 D In a Cl sample molar abundance of the 35C137CI molecule is 18 75 25 3 75 Y H 1 A re B C 72 g mol 1 C C1 C 6 25 1 D Cl 3513718 75 1 5

DA BI Can auto o que Each question has FOUR options A B C and D ONLY ONE of these four options is correct For each question marks will be awarded in one of the following categories Full Marks 4 If ONLY the correct option is chosen Zero Marks 0 If none of the options is chosen i e the question is unanswered Negative Marks 2 In all other cases Column l 1 CH 11 Fe 2 III V 3 IV Mn 2 1 ii Column II Total number of unpaired P Spin only magnetic electrons are 2 moment is 35 BM Total number of electron related to f 2 are 6 iii Total spin 2 iv Total number of electrons related to n 5 are 5 H 11 Column III 4 Q Total number of electrons having n 5 are 2 R Total number of electrons having n f 5 are 6 S Spin only magnetic moment is 24 BM DIGH III

When sodium chloride is dissolved in water energy is absorbed potential energy of the product Na aq Cl aq have higher potential energy than NaCl s H 0 1 Which statement is consistent with the very high solubility of NaCl in water The presence of Na and Cl restrict the number of possible configurations that water can adopt Na and Cl are more energetically stable in the aqueous solution Water interacts with Na and Cl ions more strongly than with other water molecules Na and Cl and water also adopt more configurations when mixed together

2 17 A 0 518 g sample of lime stone is dissolved in HCl and then the calcium is precipitated as CaC O4 After filtering and washing the precipitate it requires 40 0 mL of 0 250 N KMnO4 solution acidified with H SO4 to titrate it as MnO4 H CrO2 Mn CO 2H O 2 4 2 The percentage of CaO in the sample is a 54 0 c 42 b 27 1 d 84

10 AH of the reaction is equal to 13 C4H10 g O2 g 4CO2 g 5H O 1 2 NCERT Pg 176 1 AfH of CO2 2 AfH of H O 3 AfH of C4H10 4 AcH of C4H10 11 In isothermal free expansion of an ideal gas NCERT Pg 166

Calculate the enthalpy of combustion of pentanol from the given information Enthalpy of formation of pentanol AH 354 kJ mole O2 g C H OH 5C s Enthalpy of combustion of carbon and hydrogen are 395 5 kJ mole and 285 8 kJ mole respectivel 6H 2 g

In the sugar factory sugar is produced from sugarcane The process 5M involves the following steps not in order a The separated crystals are sent to a dryer and the dried sugar is packed b Lime is added to the juice in a mixer and the coagulated impurities are separated with a filter c The sugar crystals are separated in a basket centrifuge and the mother liquor filtrate is again sent to the evaporator for further concentration d The concentrated juice is sent to a crystallizer where the sugar crystals are formed e The clarified juice is sent to an evaporator for concentrating the juice f Extraction of juice with a roller crusher

eV Consider an electronic state y of Het whose energy The ground state energy of hydrogen atom is 136 azimuthal quantum number and magnetic quantum number are 3 4 eV 2 and 0 respectively Which of the following statement s is are true for the state y JEE Adv 2019 Paper 2 A It is a 4d state ADM B The nuclear charge experienced by the electron in this state is less than 2e where e is the magnitude of the electronic charge C It has 2 angular nodes D It hoc 3 radial podes

Which of the following represents an oxidation only change Select an answer 2 A Cu aq 2e Cu g B Mg s Fe aq Mg aq Fe s C Cl aq 2e 2Cl aq D Zn s 2e Zn s

the estimation of nitrogen 1 4 g of an organic Aan compound was digested by Kjeldahl method and the evolved ammonia was absorbed in 60 mL of M 10 sulphuric acid The unreacted acid required 20 M mL of sodium hydroxide for complete 10 neutralization The percentage of nitrogen in the compound is JEE Main 2014 1 6 2 10 3 3 4 5

A patient is required to received a 15 mg lb solution every 12 hrs The supply in the hospital is 1 2 g ml How many ml of solution does the patient need every 12 hrs Assuming that the patient is 50 kg Final answer should contain at least 4 SF

L X gm of Ag was dissolved in HNO3 and the solution was treated with excess of NaCl When 2 87 gm of AgCl was precipitated The value of x is Ag 2HNO3 AgNO3 NO H O AgNO3 NaCl AgCl NaNO3 A 1 08 gm B 2 16 gm C 2 70 gm D 1 62 gm

1996 86 If a is dissociation constant then the total number of moles for the reaction 2HI H 1 will be a 1 c 2 b 1 a d 2 a 1996 87 The pH value of N 10 NaOH solution is b 13 a 12 c

the mole of an ideal gas with Cvm 3R 2 indipendently of the temperature which was initially at 300K and 1 atm is compressed adiabatically so that the final temperature is 350K Find q w the change in U and the change in H all in joules J for the process

SolveLancer Test Quicklime is soluble in water If we want to dissolve 3 g of quicklime in water then minimum amount of water required will be SolveLancer Test a 2g b 18g c 3g d 0 96g ERK 560

23 An organic compound C H 0 was bu the amount of oxygen needed for complete combustion to CO and H O The hot gases when cooled to 0 C and 1 atm pressure measured 2 24 litres The water collected 00110 010 during cooling weighed 0 9 g The vapour pressure of pure water at 20 C is 17 5 mm Hg and is lowered by 0 104 mm when 50 g of the organic compound are dissolved in 1000 g of water Give the molecular formula of the organic compound al or gason 1983

a Calculate the kinetic energy of a photoelectron emitted by a sodium surface when light of wavelength 400 nm is incident on it The work function of sodium is 2 28 eV b Calculate the value of the longest wavelength which can result in the emission of a photoelectron from a sodium surface

When a gaseous sulphur dioxide and hydrogen sulphide mix in the presence of water the reaction SO2 2H S 2H O 3 S occurs Here hydrogen sulphide in acting as Select an answer A B C An oxidizing agent A reducing agent A dehydrating agent A catalyst

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

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

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

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

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

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

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

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

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

Assign and balance the oxidation numbers for the following redox reactions Then determine both the oxidizing and reducing agents a Zn Cu Zn Cu b Fe Ce Fe Ce c 3Ag Al 3Ag Al ER INTERSESSION

1 Assign and balance the oxidation numbers for the following redox reactions Then determine both the oxidizing and reducing agents a Zn Cu Zn Cu b Fe Ce Fe Ce c 3Ag Al 3Ag A1 FR INTERSESSION

A Newtons first law in valid from the pilot i n an aircraft which is taking off B Newtons first law in valid from the obser ver in a train moving with constant velocity Which of the following is correct Give reason for your answer a A only b B only c Both A and B are correct

4 5 6 7 8 the table by Formula N O4 Cr 06 NbFs SO3 PbBr Hg Cl VO4 AIN ating the oxidation numbers for the following elements N Cr Nb S Pb Hg V Al Element and Oxidation Number 88 O O F 310 O ZO

When an electron is bound to a proton it makes a hydrogen atom for which the accepted atomic diameter is 128 pm a Estimate the largest wavelength that an electron could have if it were trapped inside of a box of this size assume that the wave has to go to zero at the boundaries of the box From this wavelength calculate the average kinetic energy

42 The incorrect statement among the following is a a D glucose and B D glucose are anomers b the pentaacetate of glucose does not react with hydroxylamine c cellulose is a straight chain polysaccharide made up of only B D glucose units d a D glucose and D glucose are enantiomers

43 Heavy water is manufactured a by repeated electrolysis of 3 aqueous NaOH b by electrolysis of water containing heavy hydrogen dissolved in it c by combination of hydrogen and heavier isotope of oxygen d none of the above

in 0 635 x 10 3 kg of a substance of molar mass 190 x 10 3 kg mol 1 dissolved 30 5 x 10 kg of a solvent If the depression in the freezing point is 0 62 C find the molal depression constant of the solvent 2 marks