General Questions and Answers

129 Which one of the following statements is not correct 1 Except Glycine all other naturally occurring a amino acids are optically active 2 a Amino acids have maximum solubility at their isoelectric point 3 A tripeptide has two peptide bonds 4 a Amino acids exist as Zwitter ions 6800 350most do sosa 560 1 755 83 ADS 3 5 ure and Kod 2 55 38g5 Do 5 5 ro i nogom do 3 95 od 5 og 50 4 a 5 bra 2965 Carbour gotron

1 The species that has a spin only magnetic moment of 5 9 BM is T tetrahedral JEE Main 2020 d 1 MnBr 1 TJ 2 NiCl 1 T 3 Ni CO 4 Td INWONY 12

53 A closed vessel contains equal number of c hydrogen moles at a total pressure of 740 mm If c removed from the system the pressure will a remain unchanged b become half of 740 mm c become 1 4th of 740 mm DAN d becomes two times of 740 mm

Question Number 160 Question Id 8135611760 Question Type MCQ Display Question Number Yes Is Question Mandatory No Single Line Question Option No Option Orientation Vertical Maximum deviation from ideal gas behaviour among the following is expected from So I do Jaw B5050 wod 182 Diestu arba da Options 1 2 3 H g N g CH4 9 AP EAMCET 2020 AP EAMCET 2020

D 131 The volume in ml of 0 1 M solution of NaOH required to completely neutralize 100 ml of 0 3 M solution of H PO is 100 200 0 3 M H PO in NaOH 1 60 35305rmo 0 00 2 2 600 rom sesoodies riebs 01 M 3067 3 300

What is the heat of a reaction in joules with a total reaction mixture volume of 55 7 mL if the reaction causes a temperature change of 4 1 C in a calorimeter Assume that the reaction mixture has a density of 1 00 g mL and a specific heat of 4 184 J g C The calorimeter has a heat capacity of 10 0 J C

320 Thermodynamics 13 A gas may expand either adiabatically or isothermally A number of P V curves are drawn for the two processes over different range of pressure and volume It will be found that 1 An adiabatic curve and an isothermal curve may intersect 2 Two adiabatic curves do not intersect 3 Two isothermal curves do not intersect 4 All of these 14 The variation of pressure P with volume V for an ideal monatomic gas during an adiabatic process is shown in figure At point A the magnitude of rate of change of pressure with volume is 3 3 P 5 3 Po 2 3 P O 2 V 2 1 Monatomic 2 Diatomic 4 5 P 3 5 P 2 15 Figure shows the adiabatic curve on a log 7 and log V scale performed on ideal gas The gas is log T4 5 4 3 3 Polyatomic 4 Mixture of monatomic and diatomic 16 A cyclic process on an ideal monatomic gas is shown in figure The correct statement is Board Competitive Exams 1 Work done by gas in process AB is more than that in the process BC 2 Net heat energy has been supplied to the system 3 Temperature of the gas is maximum at state B 4 In process CA heat energy is absorbed by system 17 A diatomic gas undergoes a process represented by PV3 constant Choose the incorrect statement 1 The gas expands by absorbing heat from the surroundings 2 The gas cools down during expansion 3 The work done by surroundings during expansion of the gas is negative 4 None of these 18 If a gas is taken from A to C through B then heat absorbed by the gas is 8 J Heat absorbed by the gas in taking it from A to C directly is P kPa 20 10 A 200 400V cc 1 8 J 2 9 J 3 11 J 4 12 J 19 The process CD is shown in the diagram As system is taken from C to D what happens to the temperature of the system 3v 1 Temperature first decreases and then increases 2 Temperature first increases and then decreases 3 Temperature decreases continuous

134 The number of unit cells present in 39 grams of Potassium if it crystallizes as body centred cube is N Avogadro number At wt of Potassium 39 e sono od 39 ro rabo teraso 365 o De Bong Jos N Sopg N 1 135 Which of the N 3 F 3 00 39 4 N

151 0 16 gms of an organic compound containing sulphur produces 0 233 gms of BaSO Percentage of sulphur in the compound is 5 on 1 20 2016 505 255 0 233 0 BaSO30 035 r s 2 80 3 50 4 10

58 19 grams of a mixture containing NaHCO and Na CO on complete heating liberated 1 12 lit of CO at STP The weight of the remaining solid was 15 9 g What is the weight in g of Na CO in the mixture before heating NallCO 20c Na CO eo sO1 GN 19 n 2 n m ng n v 1 12 bug CO STP 5 Dosar 1 8 4 c dowod Dond any u Borg ro 15 9 m os a Na CO o m 0df Jod 3 4 0 4 10 6 2 15 9

4 First increases and then decreases 25 The variation of pressure P with volume V for an ideal diatomic gas is parabolic as shown in the figure The molar specific heat of the gas during this process is 1 3 9R 5 3R P 2 4 17R 6 8R 5

4 During process BC internal energy of the system decreases 21 A hydrogen cylinder is designed to withstand an internal pressure of 100 atm At 27 C hydrogen is pumped into the cylinder which exerts a pressure of 20 atm At what temperature does the danger of explosion first sets in 1 500 K 2 1500 K 3 1000 K 4 2000 K

2 Question Number 156 Question Id 7512345596 Question 19 Single Line Question Option No Option Orientation Vertical 3 Options Identify the relation among the rates of following nucleophilic substitution reactions 800 005 60330 000 30 Somodo bodo NaNH NaNH k k k k www universityupdates in www ios universityupdates in k k k k k k k k NH NO com www ios previousquestionpapers com NaNH k4 NaNH 1

Q 17 0 5 g mixture of K2 Cr2 O7 and KMnO4 was treated with excess of potassium iodide in acidic medium Iodine liberated required 150 cm of 0 10 N solution of thiosulphate solution for titration Find the percentage of K Cr2 O7 in the mixture

Question Number 129 Question Id 7512365249 Question Type MCQ Option Shuffling Yes Display Question Number Yes Single Line Question Option No Option Orientation Vertical Find the approximate amount of Pt in g in 1 g of Mn95Pt 0502 Atomic weight of Mn Pt and O are 55 195 0 and 16 respectively Options 2 1 g Mno 95Pt 050 Pt 385ro geef so sordom sto boa 0 95 Mn Pt 50800 0 365 rorex 565 55 195 0 5080500 16 1 3 www android previousquestionpapers com www previousquestionpapers com www ios previoung 0 20 0 15 0 1 www android rsityupdates in www universityupdates in ww ios universiruupdates in 0 25

What is electrokinetic potential Select one a the difference of potentials between potential determining ions and counterions O b the difference of potentials between counterions present in the adsorbed and diffuse layers O c the difference of potentials between potential determining ions charge and counterions present in the diffuse layer Previous page Next page

A student measured the diameter of a sphere and determined the average value His measurements are 5 17 cm 5 16 cm 5 16 cm and 5 17 cm If the true diameter is 6 18 cm what can be said about the student s results O It is accurate and precise O It is accurate but not precise O It is precise but not accurate It is neither precise nor accurate

density of sodium chloride crystal is while its X ray density is 26 The pyknometric 2 165 x10 kg m 3 2 178 x 10 kg m 3 The fraction of the unoccupie sites in sodium chloride crystal is AIPMT 2007 a 5 96 c 5 96 X10 1 b 5 96 10 2 d 5 96 10 3

A metal crystallizes in such a lattice in which only 68 of the total space of the crystal is occupied by the atoms If the atomic mass of the metal is 24 g mol and the atomic radius is 0 15nm the density of the metal is A 6 0 x 10 g cm B 6 0g cm 2 0g cm 10 x 104 g cm3

The equation which is balanced and represents the correct product s is A B C Mg H 0 EDTA exglings NaOH CuSO4 4KCN K Cu CN 4 K SO4 Li O 2KCI2LICI K 0 Mg EDTA 2 6H O

An unknown compound X on strong heating gives a colourless gas The residue obtained is further dissolved in water to obtain Y Excess of CO is passed through an aqueous solution of Y then Z is formed On slight heating of Z gives again X The X is CaCO3 Ca HCO3 2 Na CO3

Calculations 10 Two metallic oxides contain 27 6 and 30 oxygen respectively If the formula of the first oxide is X304 that of the second will be 1 XO 2 XO 3 X 05 4 X 0 Reaction 15 Calc gluc gluc 1 2 3

Arrange the following metal complex compounds in the increasing order of spin only magnetic moment Presume all the three high spin system Atomic numbers Ce 58 Gd 64 and Eu 63 a NH4 Ce NO3 6 b Gd NO3 3 and c Eu NO3 3 A a b c B b a c a c b c a b

The series of lines in microwave spectrum of H3Cl are separated by 6 26 10 Hz Calculate the momentum of inertia of H 5C1 A 2 68x1047 kg m B 6 26 10 1 Nm C 2 68x107 kg m D 2 68x1047 kg m

b Calculate the number of photons having a wavelength of 10 0 um required to produce 1 0 kJ of energy 1 mark c Calculate the total energy in 1 5 x 10 3 photons of gamma radiation having 3 0 x 10 12 m 1 mark

2 Ammonium sulfate an important fertilizer can be prepared by the reaction of ammonia with sulfuric acid according to the following balanced equation 2NH3 g H SO4 NH4 2SO4 Calculate the volume of NH3 in litres needed at STP to react with 725 g of H SO4 6 marks H 1 01 S 32 07 0 16 00

The equilibrium constant for the given reaction is approximately 10 HPO aq HCO3 aq H PO4 aq Co aq co Which is strongest conjugate base in the given reaction HPO aq B HCO3 aq H PO4 aq ao

If 0 1 molal aqueous solution of MgSO4 freezes at 0 225 then degree of dissociation of MgSO4 is Kf for H O is 1 86 Kkg mol 1 85 1 21 0 21 hr min 1 9

Thermal decomposition of two moles of solid lead nitrate gives x moles of a transparent gas y moles of a solid and z moles of a brown coloured gas The rat of x y z in a balanced chemical reaction will be 02 4 1 04 1 2 01 2 4

What percent of a sample of nitrogen must be allowed to escape if its temperature pressure and volume are to be changed from 220 C 3 atm and 1 65 litre to 110 C 0 7 atm and 1 00 litre respectively 81 8 71 8 76 8

H O is oxidised by MnO4 in acidic medium to form O and Mn How many gram of O are produced from 1 5 103 moles of MnO4 and 1 2 milligram of H O 1 1 13 10 3 7 5 10 4 2 2 5 10 4 0 35 10 5

An aqueous solution contains 0 23 M ammonia One liter of this solution could be converted into a buffer by the addition of Assume that the volume remains constant as each substance is added 0 12 mol HCI 0 23 mol KNO3 0 12 mol Ba OH 0 24 mol NH4NO3 0 24 mol HCI 000

5 Calculate the standard molar enthalpy of formation of NO g from the following information N2 g 2O2 g 2 NO2 g 2 NO g O2 g 2 NO2 g 6 Given the following data N2 g O2 g 2 NO g 2 NO g O2 g 2 NO2 g 2 N O g 2 N2 g O2 g AH 66 4 kJ AH 114 1 kJ AH 180 7 kJ AH 113 1 kJ AH 163 2

Perchloric acid is extremely corrosive and readily forms explosive mixtures A solution of perchloric acid is known to have a pH of 1 55 Determine the concentration of the fully dissociated perchloric acid at this known pH

16 Which of the following options correctly represent solubility of N in water in terms of millimoles litre if N is bubbled through water at 293 K at a pressure of 0 768 bar and Henry s contant is 76 8 K bar at 293 K 1 10 5 2 5 56 x 10 3 10 4 4 3 x 10 4

Following solutions were prepared by mixing different volumes of NaOH and HCI of different concentrations a 60 mL b 55 mL c 75 mL M 10 d 100 mL 1 b 3 c M 10 M 5 M HCI 40 mL NaOH 10 M 10 HCI 45 mL HCI 25 mL M 10 M 5 NaOH NaOH M HCI 100 mL NaOH 10 pH of which one of them will be equal to 1 2 a 4 d NEET 2018

4 A compound containing copper and chlorine was found to contain 64 19 copper and the 35 81 chlorine What would be the empirical formula of the molecule Cu 63 55 CI 35 45 b CC d a a e a a3 a ad c a a

Determine the total amount of energy released to the environment if 894 kg of decane was burned in a combustion reaction Use whatever method you wish to answer this question Enthalpies of Formation Values Decane Oxygen KJ mol 249 53 0

5 A tank contains a mixture of helium neon and argon gases If the total pressure in the tank is 65 3 kPa and the partial pressures of helium and neon are 28 7 kPa and 13 6 kPa respectively what is the partial pressure of argon a 0 031 kPa c 107 6 kPa e 23 0 kPa b 36 6 kPa d 42 3 kPa

Permanganate ion is a strong oxidizing agent and its deep purple color makes it useful as an indicator in redox titrations It reacts in basic solution with the oxalate ion to form carbonate ion and solid manganese dioxide Balance the skeleton ionic equation for the reaction betwee NaMnO4 and Na C O4 in basic solution A 6 Note show each change using a different colour or on a separate line MnO4 aq C 04 aq MnO2 s CO3 aq

65 180 Consider the following Gas Henry s law constant KH kbar at 298 K He 144 97 H 69 16 02 34 86 N2 76 48 Mark for Review The correct order of increasing solubility is He N H 0 Ons Has Nos He

A box of washing soda is despatched off the factory containing 1 50 g of Na CO3 10 H O Mw 286 A customer complains because he finds that the box appears partly empty and weighs only 1 34 g An independent analyst says that the box contains the correct mass of sodium carbonate but that it has lost water of crystallization What is the composition of the customer s soda a Na CO 1 3 H O Brainstorming b Na CO 1 7H O

58 For the coagulation of 50 ml of ferric hydroxide sol 10 ml of 0 5 M KCl is required What is the coagulation value of KC1 1 5 2 10 3 100 4 None of these

Equilibrium 2 A g B g C s will shift in forward direction by Adding inert gas at constant pressure Adding inert gas at constant volume Adding more C Removing B hr

Two solvents A and B have Kf values 1 54Kmol kg and 3 48Kmol kg respectively A given amount of substance when dissolved in 250g of A it completely dimerizes and when the same mass of the substance is dissolved in 250g of B the solute undergoes trimerization The ratio of observed depression in freezing points in two cases is A 1 B 0 5 C 0 8 D 0 4

A solution of H O2 is diluted to 10 times of its initial volume 20 mL of this diluted solution requires 10 mL of 0 2 N KMnO4 for complete oxidation The volume strength of original H O2 solution is V

100 g of given sample of mercuric oxide on heating gives 7 4 g of oxygen according to given reaction them weight of mercury obtained will be Take molar mass of Hg 200 g mol Reaction 1 HgO Hg 1 21 02 9 90 g 92 5 g 98 2 g 100 g

If a pure compound is composed of X Y3 molecules and consists of 60 of X by weight the atomic weight of Y is Tricky a 2 25 times atomic weight of X b 44 of atomic weight of X c 4 0 times the atomic weight of X d 25 of the atomic weight of X

d If you wanted to prepare 15 0 g of deep red Cr acac s using the following reaction CrCl3 3 CH3C OH CH C O CH3 CH3 3 NaOH Cr CH C O CHC O CH 3 H O 3 NaCl how many grams of the other reactants are needed

250 mL of sodium carbonate solution contains 2 65 g of Na CO3 If 10 mL of this solution is diluted to 500 mL the concentration of the solution will be 1 0 01 M 2 0 001 M 3 0 05 M 4 0 002 M ram