General Questions and Answers

AHO Latomisation C H g 2810 kJ mol AH C H g 25kJ mol AH H H 430kJ mol E Suppose Bond enthalpy of same bond in diffrent molecule will be equal Column 1 Column 2 Column 3 AHO AU A B Enthalpy of hydrogenation of C H4 g Enthalpy of formation of C H g C H6 g AHO C4H10 9 D C H4 g at very low temperature atomisation C H4 g 2255 kJ mol AHO will be positive Q AHO 225 11 P 1 Enthalpy of hydrogenation of C CH g R E of C H g is 150 R AH 125 III AS 0 kJ mol AHO AU S AHO 100 IV AGO 0

1 I IV 2 I II and IV 3 11 111 The reaction with incorrect major product is 47 H SO4 HC CH CH CHO 1 Ag 0 2 Me2 CHC1 Me CHOH BF3 C6H5OH CH N C6H5OCH3 3 4 CH CBr CBr CH3 2Zn CH3C CCH3 EtOH 4 All are correct

There is no d d transition in Cu but Cu20 is coloured due to 1 The presence of unpaired electron 2 The presence of coloured 0 ion 3 Charge transfer from oxygen to metal

In the oxymercuration demercuration of the following compound CH I H C CH CH CH CH CH OH CH COO HS NaBH The major product is expected to be 1 2 3 H C HO D H C H C H C H C 4 H C CH CH

Consider the following statements 1 An increase in pressure caused by decrease in volume at equilibrium results in increase in molar concentration of each gaseous substance involved II An increase in pressure caused by decrease in volume at equilibrium results in increase in no of moles of each gaseous substance involved III For the reaction A s B g C g at constant temperature total pressure at equilibrium of B g C g is not affected by changing the volume of container IV H O l H O g on temperature increase K of this reaction is increased Tick the correct statement s A 1 B II C III D IV

a 26 80 Hours c 82 45 Hours Zn 65 b 41 23 Hours d 53 61 Hours 4 Electrochemical equivalent of a substance is 0 0006735 g C Its equivalent weight is a 25 d 65 c 40 d 27 5 During the electrolysis of Acidulated water th hydrogen nhtained in 12

6 Which of the following adsorption isotherms shows the adsorption of a gas by a solid involving multi adsorption layer P denotes saturation pressure P a C x m x m P P P S b d x m x m P P P P

How many moles of Ca3 PO4 2 will contain 0 4 mol oxygen atom Question Type Single Correct Type 1 2 3 4 0 05 mol 0 4 mol 8 mol 4 mol

7 Two monobasic weak acids have the same concentration of H ions What is the relationship between dissociation constant and dilution 1 Ka V Ka V 2 Ka V Ka V 4 Ka V Ka V 1 3 Ka V Ka V

For melting snow from sidewalks and roads the concept of depression in freezing point is applied Consider the solutes glucose NaCl and MgCl2 If these substances have the same cost per gram the most efficient solute would be assume electrolytic salts to be 100 ionised and M m Glucose NaCl MgCl Cannot be commented

Ionic solid AB s M wt 50 crystallise in NaCl s type structure if edge length of unit cell is 1 x 10 7 cm then calculate density of AB s in 3 gm ml if it contain 100 3 schottky defect NA 6 102

48 Which of the following compounds will give methyl orange by the reaction with diazonium salt of sodium p amino benzene sulphonate 1 Aniline 2 N N Dimethyl aniline 4 m bromophenol 3 m nitro aniline 49 The relation between K and Ke for the reaction 4 g B g C g 2D g is DY P PIRTT JK DT

46 Choose the correctly matched pair from the codes given below A CH CH COCH B CH C NH 47 1 2 octanone 2 Trimethyl amine 3 Acrolein 4 Vinyl acetylene C CH CH CN D CH CH C CH 1 1 and 4 2 2 and 3 3 2 and 4 4 1 and 3 The current needed to reduce 26 6 9 of nitrobenzene to aniline in acidic medium is

0 What is the time required in seconds for depositing all the silver present in 125 ml of 1 M AgNO solution by passing a current of 241 25 A 1F 96500 C a 10 sec b 50 sec c 1000 sec d 100 sec

Ex 1 One mole of an ideal gas expands isothermally and reversibly at 25 from a volume of 10 litres to a volume of 20 litres What is the change in entropy of the gas ii How much work is done by the gas

Which of the following statements is incorrect a One gram atom of carbon contains Avogadro s number of atoms b One mole of oxygen gas contains Avogadro s number of molecules c One mole of hydrogen gas contains Avogadro s number of atoms d One mole of electrons stands for 6 02 10 electrons

8 If the rate of a reaction at 50 C is 2 6 10 3 mol L s 1 then what will be rate of reaction at 80 C Given that the temperature coefficient is 3 a 7 02 10 c 7 8 x 10 3 b 7 025 x 10 d None of these

What is the threshold energy of reaction RP in represented diagram all energy in Kcal mol 1 1 12 Kcal mol 2 14 Kcal mol 3 50 Kcal mol 4 70 Kcal mol R C HEREHEHE

17 Half life t and completion time T of the zero orden reaction are K 0 001 mol litre sec and a 1 M a 500 min 750 min b 500 sec 750 sec c 500 sec 1000 sec d None of these

32 The order of a reaction A reagent is reacted in half an hour three quarters in one product in which half the hour and seven eighth in one and half hours is a 2 b 1 c Zero d 1 32 A 103

15 The mass of 350 cm of a diatomic gas at 273 K at 2 atmospheres pressure is one gram Calculate the ma of one atom of the gas 10 jou 16 How 00 nd molecules of phosphorus are present in 124 g of phosphorus P

4 A 0 5 L reaction vessel which is equipped with a movable piston is filled completely with a 1 M aqueous solution of H O The H O decomposes to H O and O g in a first order process with half life of 10 hrs at 300 k As H O decomposes the piston moves up against constant external pressure of 1 atm The net work done from the start of sixth hour till the end of 10 hours is nearly a 100 J b 120 J c 130 J d 150 J

10 Two reactions R R have identical pre exponential factors Activation energy of R exceeds that of R by 10 kJ mol Ifk k are the rate constants for reactions R R respectively at 300 K then In k k is equal to R 8 314 J mol k a 12 c 4 b 6 d 8 18 A de m re a C 19 W f

9 Discounting economic considerations which of the following would be the best to shrinkle an icy road in quantities proportion to their respective formula weights a NaCl b CaCl c CuSO4 5H O d Al SO4 3

75 titute A 0 1 M 2 Cu aq B 0 1 M NH aq S P M In which of the following compartment Blue colour of Cu NH3 4 2 will be observed first 1 A compartment 2 B compartment 3 Blue colour will be observed at same time in both compartment 4 None of these compartment shows blue colour

is the normal molecular mass and a is the 2 If M normal degree of ionization of K Fe CN then the abnormal molecular mass of complex is a M 1 3a b M 1 2a normal normal c M 1 d None of these normal

The vapour pressure of a solution of liquid A and liquid B is 600 torr The mole fraction of component A in liquid phase is 0 7 The vapour pressure of pure A and B are respectively Question Type Single Correct Type 1 2 3 4 300 torr 130 torr 1300 torr 130 torr 300 torr 1300 torr 300 torr 300 torr

A 40 0 mL sample of sulfuric acid is titrated to a neutral end point by the addition of 15 6 mL of a 0 250 M potassium hydroxide solution 4 Write the balanced formula equation for this reaction i What is the molarity of the sulfuric acid solution in this question

37 A solution containing 12 5 g of non electrolyte substance in 185 g of water shows boiling point elevation of 0 80 K Calculate the molar mass of a substance k 0 52 k kg mol a 53 06 g mol b 25 3 g mol c 16 08 g mol d 43 92 g mol 38 10 solution of urea is isotonic with

For the reaction A B Product following data are given Expt No A 1 1M 1M 2 2M 1M 3 2M 2M Order of reaction will be B C D 1 2 3 A o 2 5 B o Rate M Sec 1 1 2 8

52 Mark out the correct statement among the following 1 Aqueous AgNO solution can be stored in a copper bowl 2 Aqueous CuSO solution can be stored in a silver bowl 3 Cu Ag can release hydrogen gas from dil HCI 4 H cannot reduce Cu and Ag in the form of metals 53 In the reaction

Decomposition of 3A g 2B g 2C g follows 1st order kinetics Initially only A is present in the container Pressure developed after 20 min and infinite time are 3 5 and 4 atm respectively Which of the given option s is are correct A 50 20 min B 175 40 min C 199 64 3min D 87 5 60 min

When x g carbon is burnt with y g of oxygen in a closed box and no residue is left which of following statement is correct regarding the relative amounts of oxygen and carbon must be less than 1 33 a c X y X must be greater than 2 67 y b must be greater than 1 33 X d y must lie between 1 33 and 2 67 X

d 9 14 A 0 1097 g sample of As O required 36 10 mL of KMnO solution for its titration The molarity of KMnO solution is a 0 02 M c 0 0122 M 15 0 52 g of a dibasic acid required 100 ml b 0 04 M d 0 3 M NaOH

14 If AgCl is doped with 105 mol of CdC1 The concentration of cation vacancies is b 6 02 x 1018 d 6 02 x 1016 a 6 02 1028 c 6 02 x 1017 5 An element at wt 50 crystallises in fcc lattice with a 0 50 nm What is the density of unit noll if it

d All are correct 13 When Cr s OH aq Cr OH aq H g basic solution is balanced the sum of the coefficients of all the reactants and products is a 14 b 15 c 17 d 9 14 A 1097 a samplo

60 In the following redox reaction XUO Cr O yHxUO2 zCr 6H O the value of coefficients x y and z respectively are b 3 8 7 d 3 1 8 a 3 8 2 c 3 2 4 How many moles of iodine are liberated wit

If O concentration in tissue is almost as higher as at the respiratory surface A B D Oxyhaemoglobin would not dissociate to supply O to the tissue CO will interfere the O transport Oxyhaemoglobin would dissociate to supply O to the tissue Haemoglobin would combine with more O at respiratory surface

2 An atomic solid crystallizes in a body centre cubic lattice and the inner surface of the atoms at the adjacent corner are separated by 60 3 pm If the atomic weight of A is 48 then density of the solid is nearly b 5 07 g cc a 2 7 g cc c 3 5 g cc d 1 75 g cc

QUESTION 23 Chemometrics is the science of extracting information from measurements made on MARKS 1 chemical systems physical system hypothetical system natural system

1st attempt Jul See Periodic Table O How much 5 60 MNaOH must be added to 600 0 ml of a buffer that is 0 0190 Macetic acid and 0 0270 M sodium acetate to pH to 5 75

4 100 mm Hg 38 K for H g water system is 5 34x107 torr If the partial pressure of H over a solution at 25 C is 760 torr then determine the solubility of hydrogen Assume density of H O and solutions are same 1 6 4 x 10 3 mol L 1 2 7 89 10 4 mol L 1 3 5 9 x 10 3 mol L 1 4 8 9 x 10 4 mol 1 1

23 NaCl is doped with Ti4 in such a way that Ti ions replace Nat at the edge centres of NaCl lattice The no of voids created per mole of NaCl are a 4 5 1023 b 1 35 x 1024 c 1 8 1024 d 3 38 x 1023

4 The Boltzmann distribution a is a measure of energy state accessibility b describes the distribution of energy associated with the dominant configura c quantifies the average energy of a chemical system that is far from equilibri d determines what specific energy level the atom molecule populates

A gas expands from 3 dm to 5 dm against a constant pressure of 3 atm The work done during expansion is used to heat 10 mole of water at temperature 290 K Calculate final temperature of water Specific heat of water 4 184 J g K Given 1 atm 101 33 J 1 290 81 K 2 290 61 K 3 290 41 K 4 290 21 K

1 The equivalent weight of P in the following reaction is 4 P NaOH H O PH NaH PO 4 M 3 M 6 where M molar mass a C b d M 11 M 2 8 9

8 When beryllium carbide is reacted with water gas X of characteristic smell is given out The oxidation state of heaviest constituent element of gas X should be a 1 b 1

Some amount of commercial AgNO3 of 50 purity is dissolved in 50 ml of water It is treated with 50 ml of KI solution The silver iodide thus precipitated is filtered off Excess of KI in the filterate is M treated with 50 ml of KIO3 solution in presence of conc HC1 when all the iodine is converted into 10 M KIO3 under similar conditions What ICI 25 ml of the same stock solution of KI requires 30 ml of 10 is the amount of AgNO3 initially taken a 0 68 g b 0 54 g c 0 45 g d 2 g

18 A 0 50 M solution of KI reacts with excess of H SO in KIO solutions according to the equation 6H 51 10 31 3H O Which of the following statements is true a 200 mL of the KI solution reacts with 0 10 mole KIO b 100 mL of the KI solution reacts with 0 060 M of H SO c 0 5 litre of the KI solutions produces 0 15 mole of 1 d None of the above

Which statement is false b c a Elements of VB group are transition elements Elements of VA group are all metalloids Elements of IA and IIA groups are metals Elements of IVA group are neither strongly electronegative nor strongly electropositive d