General Questions and Answers

A solution contains 5 62 10 M ammonium sulfite and 7 70 10 M potassium carbonate Solid barium acetate is added slowly to this mixture What is the concentration of carbonate ion when sulfite ion begins to precipitate M carbonate

1 5 4 10 m 2 5 4 10 m 3 5 4 10 m 4 5 4 10 m If the dipole moment of Toluene and Nitro benzene are 0 43D and 3 93D respectively then what is the expected dipole moment of p Nitrotoluene 1 3 50 D 2 2 18 D 3 4 36 D 4 5 30 D Methanoic acid is heated with conc H SO to form 1 CO 2 CO 3 CH 4 COOH

10 0 mL of Na CO3 solution is titrated against 0 2 M HCl solution The following titre values were obtained in 5 readings 4 8 mL 4 9 mL 5 0 mL 5 0 mL and 5 0 mL Based on these readings and convention of titrimetric estimation the concentration of Na CO3 solution is mM Round off to the Nearest Integer n

Solutions 64 g of methane g is mixed with 16 moles of oxygen g The mixture is then allowed to react to produce maximum amount of carbon dioxide g and water g Choose the correct statement regarding the above case Mole fraction of methane g in the initial reactant mixture is 0 25 Mass percent of oxygen in the limiting reagent is 100 Mass of carbon dioxide g produced is 88 g Mass percent of water a in

The Balmer series in the hydrogen spectrum corresponds to the transition from m 2 to n 3 4 This series lies in the visible region Calculate the wave number of line associated with the transition in Balmer series when the electron moves to n 4 orbit RH 109677 cm

Which of the following combinations of solutes and solvents could result in a solution Check all that apply H O and hexane CH CH CH CH CH CH Ethanol CH CH OH and H O H O and Na SO Hexane CH CH CH CH CH CH and ethane CH CH Do you know the answer

A certain reaction B is getting converted to B 4 in solution The rate constant of this reaction is measured by titrating a volume of the solution with reducing agent which reacts only with Bnt B 4 In this process it converts B to B n 2 and B n 4 to B n 1 At t 0 the volume of reagent consumed is 26 mL and at t 23 minutes volume used is 35mL Bn to B 4 is first order reaction The rate constant is 1 33x10 min log 1 3 0 1139 The value of x is

TE TE IE IE Element S 796 1583 3238 4362 The values of dissociation constant of some bases are given below Which is the weakest base 1 1 8x10 2 4 8x10 0 3 7 2x10 4 7 07 10

2 HCl 1 aq MgCl aq The initial masses of the uncombined reactants appear below Mg Mass of Magnesium Mg Mass of Hydrochloric Acid HCI 99 1 0 H 51 The reactants are combined and the final mass of the system is determined If the final mass of the system is 120g what was the percent yield of the reaction 35 48 g 73 g

3 CH CH CH CH CH C CH CH CH 4 CH CH CH CH CH C CH CH CH Which of the following is the disproportionation redox reaction 1 2CH COOH is 2 2CH CHO NG I 3 2CH COCH 4 2HCHO 50 NO g H O Determine the stability order of given carbocations

20 ml solution contains 0 1 M NH4Cl and 0 01 M NH4OH By adding which one its pH will not change Addition of 1ml water O Addition of 5ml 0 1 M NH4Cl O Addition of 5ml 0 1 M NH4OH O Addition of 10ml 0 1M NH4Cl

Use the balanced equation to answer the following question 6CUNO3 Al2 SO4 3 3Cu2SO4 2AI NO3 3 Molar mass of CUNO3 125 56 g mol Molar mass of Al NO3 3 213 01 g mol How many grams of copper 1 nitrate CUNO3 are required to produce 44 0 grams of aluminum nitrate Al NO3 3 77 81 g 155 62 g 24 88 g

Draw the complete mechanism for the radical reaction shown light CH CI Arrow pushing Instructions 3 Use curved arrows to show the mechanism of the initiation step below Make the ends of your arrows specify the origin and destination of reorganizing electrons Sight 00 Br m light H Homolytic cleavage of Br gives two Br radicals light 20 Homolytic cleavage of Br gives two Br radicals 2 Br Arrow pushing Instructions points Delete CH CIBr Correct b Use curved arrows to show the mechanism of the propagation step below Make the ends of your arrows specify the origin and destination of reorganizing electrons Correct Previous Next Email instructor

1 5 2 8 4 In the reaction 4 4 2B 3C A B C what will be the number moles of product formed starting from one mole of A 0 6 moles of B and 0 72 moles of C 1 0 25 2 0 3 3 0 24 4 2 32 The solubility of AgCl s with solubility product 1 6 10 in 0 1 M NaCl solution would be 1 1 26 10 M 3 1 6 10 M 4 1 26 10 M 2 1 6 10 M

Which one is the wrong statement 1 The uncertainty principle is AE x At h 4t 2 Half filled and fully filled orbitals have greater stability due to greater exchange energy greater symmetry and more balanced arrangement 3 The energy of 2s orbital is less than the energy of 2p orbital in case of Hydrogen like atoms h 4 de Broglie s wavelength is given by A my where m mass of the particle v velocity of the particle

At a constant pressure P the plot of volume V as a function of temperature T for 2 moles of an ideal gas gives a straight line with a slope 0 328 L K value of P in atm is closest to Gas constant R 0 0821L atm mol K A 0 25 0 5

3 Calculate the difference between heat of combustion of carbon monoxide gas at constant pressure and at constant volume at 27 C R 2 cal K mol A 54 cal B 600 cal C 300 cal D 27 cal 4 The conductivity of an electrolytic solution decreases on dilution due to

56 57 The configuration of the compound H C 1 R I CH Cl is 2 S 3 E 4 Z The first ionization energies of magnesium and aluminium are respectively 1 7 64 5 98 2 7 64 7 64 3 5 98 7 64 4 5 98 5 98 given by

A block A of mass 2m is hanging from a vertical massless spring of spring constant k and is in equilibrium Another block B of mass m strikes the block A with velocity u and sticks to it as shown in the figure The magnitude of the acceleration of the combined system of the blocks just after the collision is 8 000000 2m A 3 o 4 zem

1 00 g of BaCl2 is treated with excess of aqueous AgNO3 and all chlorine is recovered as 1 38 g of AgCl What is the atomic weight of BA Cl 35 5 Ag 108 A 137 B 172 5 C 33 D 68 5

An aqueous solution contains a mixture of Ca NO and Al NO A sample of this aq solution is 2M in Ca NO3 and 3m in AI NO What should be the density of solution such that the molality and molarity of NO ion becomes numerically same Molar masses Ca NO 164 g mol Al NO 213 g mol A 1 0 gm ml B 1 967 gm ml C 1 310 gm ml

ven 3 er A xenon compound A upon partial hydrolysis gives XeO F The number of lone pair of electrons present in compound A is Round off to the Nearest Integer

An element occurs in BCC structure with a edge length of 288 pm The density of the element is 7 2 gm cm How many atoms of the elemen does 208 g of the element contain 1 24 16 x 1022 2 24 16 x 1023 3 24 16 x 1024 A

4 i Suppose 2000 marbles glass balls are moving randomly on a floor which is 10 ft x 10 ft If the diameter of each marble is 1 inch and their velocity is 5 ft s derive formulas for and then calculate the mean free path the number of collisions per minute made by each marble and the total number of collisions per minute

Among ligands NH3 en CO and CN the correct field strength order is A skipped B NH3 en GN CO D CO NH3 CN en CO NH en CN NH3 en CO CN

62 63 Which among the following depicts the correct order of acidity 1 CH CH CH CH CH CH C CH CH CH 2 CH CH CH C CH CH CH CH CH 3 CH CH CH CH CH C CH CH CH 4 CH CH CH CH CH C CH CH CH Which of the following is the disproportionation redox reaction

83 84 A B CH CH CH 2 A C D B D CH CH CH 1 C B D A 4 C B A D The paramagnetic species is 1 SiO 2 Tio 3 BaO 4 KO In which of the following compounds nitrogen exhibits highest oxidation state C CH CH 3 A C B D

N 3H 2NH3 Which is correct statement if N is added at equilibrium condition 2006 3M a The equilibrium will shift to forward direction because according to IInd law of thermodynamics the entropy must increases in the direction of spontaneous reaction b The condition for equilibrium is G N 3G H 2G NH3 where G is Gibbs free energy per mole of the gaseous species measured at that partial pressure The condition of equilibrium is unaffected by the use of catalyst which increases the rate of both the forward and backward reactions to the same extent rolgo c The catalyst will increase the rate of forward reaction by a and that of backward reaction by B svilosid d Catalyst will not alter the rate of either of the reaction

Cellular Respiration occurs when the body converts energy into usable energy The equation for cellular respiration is as follows C6H 2O6 60 6CO 6H 0 12 When burning 188 16g of C6H12O6 how many grams of carbon dioxide will be produced 45 95g CO2 276g CO2 128g CO2 7 65g CO2

A solute has a KD between water and chloroform of 5 00 Suppose we extract a 50 00 mL sample of a 0 050 M aqueous solution of the solute using 25 00 mL of chloroform What volume of chloroform do we need if we wish to extract 95 0 of the solute O 190 mL 96 mL 191 mL 95 ml A B C D

CH3 3 58 The hypothetical complex triamminediaquachloridocobalt III chloride can be represented as 1 C NH H O CC 3 Co NH H O C CH3 2 Co NH H O C 4 C NH H O C

Correct option for an endothermic gaseous reaction A B 3C will be 1 AH 0 AS 0 3 AH 0 AS 0 2 AH 0 AS 0 4 AS 0 AS 0 zone assuming no

Structure of Atom 141 32 In any sub shell the maximum number of electrons having same value of spin quantum number is 1 1 3 2 1 For the 2 1 2 4 4 2

33 For the transition from n 2 n 1 which of the following will produce shortest wavelength 1 H atom 3 He lon it 2 Datom 4 Lion

Select the statements that correctly define parts per million ppm concentration ppm ppm ppm ppm volume of solute mL mass of solution g volume of solute ml volume of solution mL mass of solute g mass of solution g x 108 Check all that apply volume of solute ml volume of solvent mL x 10 x 10 x 10 Do you know the answer

Aqueous ammonia is used as a precipitating reagent for Al ions as Al OH rather than aqueous NaOH because 1 NH is a weak base 3 NaOH forms Al OH Jions Cellulose is a polymer of 2 NaOH is a very strong base 4 NaOH forms Al OH Jions

In Tollen s test for aldehyde the overall number of electron s transferred to the Tollen s reagent formula Ag NH3 2 per aldehyde group to form silver mirror is Round off to the Nearest Integer en er

Q 17 neon dioxygen mixture contains 70 6 g dioxygen and 167 5g neon If pressure of the mixture of the gases in the cylinder is 25 bar What is the partial pressure of dioxygen and neon in the mixture

Neutral ferric chloride is added to the aqueous solution of acetate The blood red colour is obtaine it is due to the compound 1 Fe OH 2 Fe OH 4 Fe OH CH COO 3 Fe CH COO OH Methane is quite stable whereas silane is unstable Because 1 C Cbond energy is much greater than Si Si bond energy 2 Si hond energy is much lower than C H bond energy

The degree of dissociation of HI at a particular temperature is 0 8 Find the volume of 1 5M sodium thiosulphate solution required to react completely with the iodine present at equilibrium in acidic conditions when 0 135 mol each of H and I are heated at 440 K in a closed vessel of ity 201

46 47 CHEMISTRY Consider the following statements Roasting is carried out to 1 Convert sulphide into oxide 2 Melt the ore 3 Remove moisture water of hydration and expel organic matter 4 Remove sulphur and arsenic in the form of volatile oxides Out of these statements 2 1 2 and 3 are correct 4 1 2 and 4 are correct 1 1 3 and 4 are correct 3 2 3 and 4 are correct Which of the following is the enantiomer of the structure

22 23 24 2 dy d A solenoid 1 5m long and 0 4cm in diameter possesses 10 turns cm A current of 5 A flows through it The magnetic field at the axis inside the solenoid is 3 4x 10 T 1 2 10 T 2 2xx 10 T 4 4 10 T If two mirrors are kept at 60 to each other then the number of images formed by them is 1 5 2 6 3 7 4 8 If the balance length corresponding to points B and C is 40cm on the potentiometer wire the balance

The equilibrium constant of mutarotation of a D glucose to B D glucose is 1 8 What percent of the a form remains under equilibrium 1 35 7 2 64 3 3 55 6 4 44 4

In which of the following reaction hydrogen is acting as an oxidising agent 1 With iodine to give hydrogen iodide 2 With lithium to give lithium hydride 3 With nitrogen to give ammonia 4 With sulphur to give hydrogen sulphide

54 55 CH H C 3 4 Containers A and B have same gases Pressure volume and temperature of A are all twice as that of B then the ratio of number of molecules of A and B are 1 1 2 2 1 4 3 4 1 4 2 1 Which of the following ion is expected to have highest value of molar conductivity at infinite

In carius method of estimation of halogen 0 2 g of an organic compound gave 0 188 g of AgBr The composition of bromine in the compound is molecular mass AgBr 188 u atomic mass Br 80 u 40 30 20

If the radiation corresponding to the second line of Balmer series of Li2 ion knocked the electron from the first excited state of H atom what is the kinetic energy of electron in eV A 19 55 B 21 68 c 27 68 D 30 10

Henry s law constant for the molality of methane in benzene at 298 K is 4 27x10 mm Hg Calculate the solubility of methane in benzene at 298 K under 760 mm Hg 1 2 56 10 2 1 78 10 3 3 78x102 4 4 13x10 Choose the incorrect statement 1 The shape of an atomic orbital depends upon the azimuthal quantum number 2 The orientation of an atomic orbital depends upon the magnetic quantum number 3 The energy of an electron in an atomic orbital of multi electron atom depends only on principal

PHYSICS A rod P of length Im hinged at one end A and there is a ring attached to the other end Another long rod Q is hinged at B and it passes through the ring The rod P is rotated about an axis which is perpendicular to the plane in which both rods are present and the variations between the angles and are plotted as shown The distance between the hinges A and B is 113m B 2 1 m P 3 2m 0 4 2 2 m

At nos Mn 25 Fe 26 Co 27 Ni 28 5 Which of the following is not among shortcomings of Bohr s model 1 Bohr theory could not account for the fine lines in the atomic spectrum 2 Bohr theory was unable to account for the splitting of the spectral lines in the presence of magnetic field 3 Bohr theory failed for He atom 4 It did not give information about energy level