General Questions and Answers

7 20 mL of CH3COOH reacts with 20 1 mL of C H5OH and produce CH3COOC H5 according to the following reaction density of CH3COOC H5 is 0 902g mL CH3COOH C H5OH CH3COOC H5 H O a Which one is the limiting reagent in this reaction b If 27 5 mL of pure CH3COOC H5 is produced then find the percentage amount of production density of CH3COOH and C H5OH are 1 05g mL and 0 789g mL respectively

3 0 molal NaOH solution has a density of 1 110g mL The molarity of the solution is a 29732 b 3 05 a 3 0504

6 The reaction H S H O2 S 2H C manifests 1 Oxidising action of H O 2 Reducing nature of H O 3 Acidic nature of H O 2 4 Alkaline nature of H O

A balloon blown up with 1 mole of gas has a volume of 480 mL at 5 C The balloon is filled to 7 8 th of ins maximum capacity Suggest a Will the balloon burst at 30 C b The minimum temperature at which it will burst c The pressure of gas inside the balloon at 5 C d The pressure of gas when balloon bursts

The oxidation state shown by silicon when combines with strong electropositive metal is 1 2 2 4 3 4 4 2

The equilibrium constant K for the reaction 2NOCI g 2NO g Cl g is 6 95 x 108 at 298 K The standard Gibb s free energy change AG at 298 K will be R 2 cal K 1 mole log 6 95 0 8420 1 4 912 kcal 3 7 3 kcal 2 14 74 kcal 4 9 825 kcal

The sum of the number of lone pairs of electrons on each central atom in the following s is JEE Adv TeBr BrF SNF and XeF3 Atomic number N 7 F 9 S 16 Br 35 Te 52 Xe 54

7 One litre of a mixture containing BaF2 and H SO4 was taken for analysis 25 mL of this mixture was treated with 20 0 mL of 0 1N KOH for complete neutralisation Another 25 mL of the mixture was added to 100 mL of 0 05 N K CO3 solution and precipitate was filtered off The filtrate required 12 mL of 0 025 M oxalic acid solution using phenolphthalein as indicator Find the strength of BaF and HSO in mixtura

Density of 2 05 M solution of acetic acid in water is 1 02 g mL The molality of same solution is a 1 14 mol kg c 2 28 mol kg 1 AIEEE 2006 b 3 28 mol kg d 0 44 mol kg 1

59 10 mole of SO2 and 15 mole of O2 were passed over catalyst to produce 8 mole of SO3 The ratio of SO 2 and SO 3 moles in mixture is a 5 4 b 1 4 c 1 2 d 3 4

8 Light of wavelength 300 x 10 m strikes a ma surface with photoelectric work function of 2 13 Find out the kinetic energy of the most energ photoelectron

4 412 H S 4H O 9 A drop 0 05 mL of 12M HCl is spread over a thin sheet of aluminium foil thickness 0 10 mm and density of Al 2 70g mL Assuming whole of the HCl is used to dissolve Al what will be the maximum area of hole produced in foil

Back bonding plays a central role in the following phenomena B X bond length is lower in BF3 as compared to BC13 Stronger acidic strength of CH3 3SiOH as compared to CH3 3COH Less lewis basic strength of SiH3 3N as compared to CH3 3N Less stability of Si Si X as compared to

45 Study the table carefully and select the appropriate options Sample Physical P Q R S State Solid of electricity X P 1 Aluminium 2 Phosphorus 3 Iron 4 Sulphur X Conductor Ductility Q CGraphite Nitrogen Zinc Copper X R Bromine Magnesium Tin Potassium X X X S Sodium Aluminium Fluorine Bromine

2 How much of Fe can be theoretically obtained by the reduction of 1 kg of Fe O3 3 Calculate the mass of 60 H SO4 required to decompose 50 g of chalk calcium carbonate Which is chooner 40 hydrochloric acid at the rate of 50 paise per kilogram or 80 H SO a

Electron Affinity of Cl is 3 7 eV How much Energy released in kCal when 2g of gaseous chlorine atoms is converted to Cl ions in the gaseous state A 4 80 kCal Correct Answer 5 20 kCal 1 50 kCal MANSZAMAL water wwwww stop NYAMA

Zinc is reacted with Hydrochloric acid to form zinc chloride and hydrogen gas The reaction is carried out in a glass container that has a mass of 14 7 grams After placing the zinc in the glass container the mass is 29 5 grams The hydrochloric acid is poured into the container and the zinc chloride is formed The excess hydrochloric acid is removed leaving the glass container and the zinc chloride which together have a mass of 37 5 grams What is the percentyield Zn 2HCl aq ZnCl H g

6 02 x 1020 molecules of urea are present in 100 mL solution The concentration of urea solution is AIEEE 2004 a 0 1 M c 0 02 M b 0 01 M d 0 001 M

4 Mno 1 mole in neutral aqueous disproportionates to 1 2 3 2 3 1 3 1 3 2 mole of MnO and mole of MnO and mole of Mn O and 4 mole of Mn O and 13 32 3 2 3 1 mole of MnO2 of Ma mole of MnO mole of MnO 2 mole of MnO

36 Which of the following arrangements of electrons is most likely to be stable 3d 3d 4s 1 A 4s 2 41

In the following change 3Fe 4H O Fe O4 4H If the atomic weight of iron is 56 then its equivalent weight will be dib 1 42 2 21 3 63 4 84

9 Gold number gives a the amount of gold present in the colloid rano b the amount of gold required to break the colloid CREMO c the amount of gold required to protect the colloid d none of the above FIORE

Q16 Increasing order of thermal stability of I K CO A I II III II MgCO B II III I III Na CO C II I III D I III IL

7 If we add dilute aqueous solution of KI dropwise to AgNO aqueous solution the Agl colloid formed will have a negatively charged b positively charged Jam c neutral d nothing can be predicted loz siht AgI KN 90

0 In S be the specific charge e m of cathode ray S be that of positive rays then which is true a S S b S S c S S d Either of these

500 ml of 10 5 M NaOH is mixed with 500 ml of 2 5 x 10 5 M of Ba OH To the resultin solution 99 L water is added Calculate pH

56 A sea water sample has a density of 1 03g cm and 2 8 NaCl by mass A saturated solution of NaCl in water is 5 45 M NaCl How much water would have to be evaporated from 106 litre of sea water before NaCl would precipitate

6 JEE 200 Statement 1 Pb 4 compounds are stronger oxidizing agents than Sn compounds Statement 2 The higher oxidation states for the group 14 elements are more stable for the heavier mem of the group due to inert pair effect A Statement 1 is True Statement 2 is True Statement 2 is a correct explanation for Statement 1 B Statement 1 is True Statement 2 is True Statement 2 is NOT a correct explanation for Statement 1 C Statement 1 is True Statement 2 is False D Statement 1 is False Statement is Trun

1 At 300 K and 1 atm 15 mL of a gaseous hydrocarbon requires 375 mL air containing 20 Q by volume for complete combustion After combustion the gases occupy 330 mL Assuming that the water formed is in liquid form and the volumes were measured at the same temperature and pressure the formula of the hydrocarbon is 1 C3H6 2 C3Hg 3 C Hg

muoride UF 6 from of uranium The molar mass of UF is 352 g mol Nitric acid is manufactured by the Ostwald process in which nitrogen dioxide reacts with water 3 NO g H O 1 2 HNO3 aq NO g How many grams of nitrogen dioxide are required in this reaction to produce 25 2 g HNO

30 On addition of NaOH to CH COOH solution 60 of the acid is neutralised If pK of CH3COOH is 4 7 then the pH of the resulting solution is 1 More than 4 7 but less than 5 0 2 Less than 4 7 but more than 4 0 3 More than 5 0 4 Remains unchanged

5 4 A solution at 20 C is composed of 1 5 mol of benzene and 3 5 mol of toluene If the vapour pressure of pure benzene and pure toluene at this temperature are 74 7 torr and 22 3 torr respectively then the total vapour pressure of the solution and the benzene mole fraction in equilibrium with it will be respectively 1 35 0 torr and 0 480 2 38 0 torr and 0 589 30 5 torr and 0 389 3 35 8 torr and 0 280 U10 camera

52 Which of the following gaseous molecules is polar a CS2 b BF3 c SnCl d PbC14

d 0 477 M and 0 477 M 2010 6 10 g of hydrogen and 64 g of oxygen wer filled in a steel vessel and exploded Amour of water produced in this reaction will be a 3 mol b 4 mol c 1 hol d 2 mol 200

The species in which the 1 NO2 2 NO 3 NO The pair in which phosphorous atoms have a formal oxidation state of 3 is 1 Pyrophosphorous 2 Orthophosphorous and pyrophosphoric acids and pyrophosphorous acids 3 Pyrophosphorous and hypophosphoric acids 4 Orthophosphorous and hypophosphoric acids molecular force is most responsible in allowing xenon gas to liquefy N

4 A solution labelled 65 0 by weight H SO has a density of 1 43 gm ml at 20 C A concentrated soluton of NH is 20 by weight having d 0 898 gm ml what maximum volume of NH solution can be completely neutralised by 5 ml of a concentrated given H SO solution 1 3 4 C

69 Among the following the number of elements showing only one non zero oxidation state is Cl F P Na O Sn Tl N Ti

7 5 5 g of a mixture of FeSO4 7H O ar Fe2 SO4 3 9H 0 required 5 4 mL of 0 1N KMnC solution for complete oxidation Calculate mole hydrated ferric sulphate in mixture IIT 198 3 0 5 g sample containing Mp in

Two solutions of a substance non electrolyte are mixed in the following manner 480 ml of 1 5M of first solution with 520 ml of 1 2M of second solution The molarity of final solution is AIEEE 2005 a 1 20M c 1344M b 1 50M d 2 70M

3 17 g of a substance was deposited by the flow of 0 1 mole of electrons The equivalent weight of the substance is A 3 17 B 0 317 C 317 D 31 7

JEE 71 The total number of lone pairs of electrons in melamine is 72 Assuming 2s 2p mixing is NOT operative the paramagnetic species among the following is A Be BY B C C D N JEE 79

Acertain crude oil has an idex of refraction of 1 25 A ship dumps 1 m of this oil into the ocean and it spreads into a thin uniform film on water surface When light of wavelength 500 nm is incident on it the reflected light shows maximum What is the area in km covered by the spilled oil Assume that the thickness of film is minium required to satisfy this criterion

Under the action of force P the constant acceleration of block B is 6 m sec up the incline For the instant when the velocity of B is 3 m sec up the incline Choose the correct option s A Velocity of B relative to A 1m s B Acceleration of B relative to A is 2 m s C The velocity of point C of the cable in ground frame is 4 m s D Velocity of B relative to A is 2m s 20

If valence factor n factor of compound NaHC 0 2H C 0 3K C 0 4A1 C O 3FeC 0 in acid base titration is x and redox titration with KMnO is y then value of y x is A 8 4 B 9 C 11 25 D 12 INH1 0 25M What will be monio LI T TT

In a mole of water vapour at STP the volume actually occupied or taken up by the molecules i e Avogadro number the volume of one molecule is a less than 0 1 of 22 4 litres b about 10 of the volume of the container of 22 4 litres c between 10 to 20 of 22 4 litres d between 2 to 5 of 22 4 litres

Find out number of reactions giving optically active diastereomeric pair b a Me CH Et 1 Cl d HC1 CCI SbCl HI CCL e 2 chlorobutane f Racem ic m ixture of 2 butanol 2 methyl butanoic acid c AICI HBr CC1

8 500 mL of a solution contain 1 10th of equivalen mass of HCI The normality of solution will be a et b 0 3 c 0 2 d 0 4

Assuming a black body at a temperature of T and that the Earth is also a black body Diameter of Sun subtends a very small angle 0 radians at the centre of Earth Neglect sources of heat from the Earth itself If an opaque cloud of dust particles in the form of a spherical shell with a radius equal to half the radius of the Earth s orbit were interposed between Earth and Sun centred on the Sun Mark the CORRECT statement s Assume cloud of dust and earth to behave as black body A Equilibrium temperature of cloud T is T e B Equilibrium temperature of cloud T is Ts C Equilibrium temperature of Earth T is 2 TD D Equilibrium temperature of Earth T is 4 Colo 0 AC

m The correct expression x 1 aP a c m x m b 1 aP 1 bP for Langmuir adsorption isotherm is x b d m X aP 1 bP 1 bP m a YE EI ap Top T op ab a n btained according to Langmuir

5 The molality of 1M solution of NaCl specific gravity 1 0585 g mL is a 1 0585 b 1 0 c 0 10 d 0 0585