Physical Chemistry Questions

An amino acid residue in a protein structure is found to adopt the following backbone 4 values 130 130 This amino acid is UNLIKELY to be a lysine residue a proline residue a serine residue a glycine residue

Which of the following statement is true 1 Silicon exhibits maximum 4 coordination number in its compound 2 Bond energy of F is less than Cl 3 Mn III oxidation state is more stable than Mn II in aqueous state 4 Elements of 15th group shows only 3 and 5 oxidation states

Among the following mixtures dipole dipole as th major interaction is present in 1 Benzene and CCI 4 2 Benzene and C H5OH 3 CH3COCH3 and CH CN 4 KCI and water

C Grams of Al2 SO4 containing 32 amu of S A chemical compound dioxin has been very much in the news in the past few years It is the by produc of herbicide manufacture and is through to be quite toxic Its formula is C 2H CL O If you have a sampl of dirt 28 3 g that contains 8 78 x 10 moles of dioxin calculate the percentage of dioxin in the di

AU of combustion of methane is 300 kJ mol The value of AH is Options 300 kJ mol 11 Greater than 300 kJ mol 0 kJ mol Less than 300 kJmol Solution Answer 4 NOF F 1 VI Dart 1 Dana Na 190

Find number of orbital s in L shell that is are possible when values of magnetic quantum number m 1 to zero to 1 integral value only The total number of compounds shown below that form phenyl hydrozone derivatives under

Selecting and Handling Reagents and Other Chemicals PROBLEM A purifying agent is required in sugar industry to clarify extracted cane juices EXPLAIN what class based on purity of purifying agent must be used

pic Full Syllabus The decomposition of NH4NO into N and H O is first order reaction Which of the following graph is correct 1 2 3 log NH NO log NH NO log NH NO log NH NO time time time

sec 39 SO CL g SO g Cl g Time Exp No 1 1 7 8 x 10 3 7 8 x 10 2 0 65 atm 0 100 atm sec atm sec 4 1 x 10 2 sec P Total 0 5 0 6 ff fou 2 3 9 x 10 atm sec 4 3 9 x 10 atm sec

3 In calcium fluoride having the fluorite structure the coordination numbers for calcium ion Ca and fluoride ion F are a 4 and 2 c 8 and 4 b 6 and 6 d 4 and 8 NEET II 2016 Lithium has a bcc structure Its density is

26 331 NH C Br aq NaNO Cu A A D NaNO HCI 0 5 C BHBF4 1 2 4 6 tribromofluorobenzene 2 2 4 6 tribromonitrobenzene 3 P bromofluorobenzene 4 P hromonitrobenzene

Which of the following solutions has the highest H ion concentration Only one correct answer A Aqueous solution of quick lime B Brine C D Vinegar Milk of magnesia suspension

139 Which of the following statement s is are correct Statement i The entropy of isolated system with P V work only is always maximized at equilibrium Statement ii It is possible for the entropy of close system to decrease substantially in an irreversible process 1 Statement iii Entropy can be created but not destroyed system Statement iv AS is zero for reversible process in an isolated system A Statement i ii iii B Statement ii iv C Statement i ii iv DYAll of these

1 6 107 Pa KH Henry s law constant for N gas in water at 27 C 80 K bar In diamond crystal the ratio of number of carbon atom per unit cell and the numbe of C C bonds per carbon atom is Vander waal s gas equation may be expressed as

140 For ortho phosphoric acid H PO4 aq H O aq H O aq H PO4 aq K H PO4 aq H O aq H O aq HPO2 aq K HPO2 aq H O aq H 0 aq 4 PO aq K a3 The correct order of K values is a1 A Ka K Ka B Ka K Ka 1

47 Incorrect match among the following Maximum Complex 1 Co NH3 6 C13 2 Co NH3 5Cl Cl2 3 Co NH3 4Cl CI 4 Co NH3 3C13 AgCl ppt given 3 moles 2 moles I moles 0 moles Total ions in water 4 3 2 1

The diffusion coefficient of an ideal gas is proportional to the mean free path and mean speed The absolute temperature is made 9 times while the pressure is increased 3 times As a result the diffusion coefficient becomes x times The value of x is

3 The number of atoms in 100 g of a fcc crystal with density d 10 g cm and cell edge equal to 100 pm is equal to a 2 1025 c 4 x 1025 b 1 1025 d 3 x 1025 1994 44 Ionic solids with Schottky defects contain in their structure

Example of redox reaction is Options Na HCI NaCl H Na O 2HCI 2NaCl H O 2 NaOH HCI NaCl H O Na CO3 2HCI 2NaCl H O CO Solution Answer 1 NCERT Reference Redox reaction XI part 2 Page No

Decreasing order of bond length of given molecules C O N O C C C N is Options C C N 0 C 0 C N C C C O N 0 C N C N C C N O C O C C C N N O C O ped

Compare heat of hydrogenation of the following 00 1 1 2 3 4 Correct Answer 2 ii i ii iii iii ii i ii i iii ii iii i 1

2 A metal crystallises with a face centred cubic lattice The edge of the unit cell is 408 pm The diameter of the metal atom is a 288 pm c 144 pm b 408 pm d 204 pm 2012 13 The number of octahedral void s per atom present in a cubic close packed structure is

If Avap H for water at 298 K is 44 kJmol then how much heat is required to evaporate 9g of water at 298 K Options 11 KJ 22 kJ 99 kJ 396 kJ Solution Answer 2

21 Xylem and phloem are responsible for 1 poin O a Conduction of water and food O b Conduction of water and mineral O c No roll in lower plants d None of these

1 If we mix a pentavalent impurity in a crystal lattice of germanium what type of semiconductor formation will occur a n type semiconductor b p type semiconductor c both a and b d None of these 1996 2 An element atomic mass 100 g mol having

PART III CH Copper crystallises in a structure of face 1 centerd cubic unit cell The atomic radius of copper is 1 28 What is axial length on an edge of copper A 2 16 C 3 94 B 3 62 D 4 15

143 In the ionic equation 2K BrO3 12H 10e Br 6H O 2K the equivalent weight of KBrO3 will be B M 2 A M 5 D M 4 C M 6 where M molecular weight of KBrO3

Column l Q1 Electrolysis of aq CuSO4 solution using copper electrodes Q2 Electrolysis of dil H SO4 using inert electrodes Q3 Electrolysis of aq NaF using inert electrodes Q4 Recharging of lead storage battery Column II A1 Density of H SO4 increases A2 No change in molarity of electrolyte solution A3 H is liberated at cathode A4 Positive electrode is anode and negative electrode is cathode A5 O is liberated at anode

5 The relationship between osmotic pressure P at 273 K when 10 g glucose P 10 g urea P and 10 g sucrose P3 are dissolved in 250 ml of water is 1 P P P3 1 2 2 P P P3 2 1 3 P2 P3 P 1 C C

The rate constant for the reaction 2N O g 4NO2 g O g is 2x10 sec given temperature If the reaction is started 10 mole per lit N O then the rate of formation of N O is xx104 mole L sec at a moment at that moment concentration of O is 2g mole Lit Then x is

o O In all other A single electron orbits around a stationary nucless of charge Ze where Z is a constant and e is the magnitude of electronic charge It requires 47 2 eV to excite the electron from second Bohr orbit to the third Bohr orbit What would be the energy required to excite the electron from n 3 to n 4 in eV

13 Decomposition of N O5 is first order reaction t of the reaction N O5 2NO O is 2 4 hr at 1 2 STP Starting with 10 8 gm of N O5 how much oxygen will be obtained after a period of 9 6 hr 1 1 5 litre 2 3 36 litre 3 1 05 litre 4 0 07 litre

Mass of CaCO3 required to react completely with 320 mL of 0 25 M HCI is Options 4 g 8 g 6 5 g 12 5 g Solution

3 e g pH for 10 3 M HCI is 3 Note pH pOH pk i e pH pOH 14 at 298K 7 Example 6 Solution S K changes with temperature and accordingly the pH scale also changes Fre Alfu Peti f The concentration of H ion in a sample of soft drink is 3 8 x 10 pH log H log 3 8 x 10 30 58 2 42 J

3 The formula of nickel oxide with metal deficiency defect in its crystal is Nio 98 O The crystal contains Ni and Ni ions The fraction of nickel existing as Ni ions in the crystal is 1 0 96 2 0 04 3 0 50 4 0 31

In an experiment similar to the one you will be conducting this week the vapor of a 0 475g of an organic alcohol filled up a 250 mL Erlenmeyer flask at 97 degrees C and 730 mm Hg What is the molar mass of the alcohol

Question No 30 40 Detection of equivalence point with indicator is difficult AO Autoprotolysis constant for different solvents are available BO Dielectric Constant are very high for different solvents CO All of these DO Equilibrium constant are not available

If a photon of energy 14 eV is H atom what is true 1 Atom will be ionised and electron will have a kinetic energy of 14 eV 2 Atom will be ionised and electron will have a kinetic energy of 0 4 eV 3 Photon passes through atom without interacting with it 4 More than one electrons will make transitions

Which is symbolic representation 2 Mg s Cl2 g Mg aq 2Cl aq N Red cathad A Pt Cl2 g 1bar Cl aq 1M Mgaq 1M Mg for following cell reactio omrade 11 cathade 2 B Mg Mg 1M Gl2 g 1 bar Cl aq 1 M Pt 2 t Cl aq 1M C12 g 1 bar Mg aq 1M Mg 2 D Mg Mg aq 1M Cl aq 1M Cl2 g 1 bar Pt

2 12 points total A wastewater pH 9 is contaminated with the following acid base 001 armiog latot In 152 maldos systems H3ASO4 H ASO4 HASO4 AsO4 pKa 1 2 3 pK a2 6 8 pK a 3 11 6 N2H6 N2Hs N H4 pK a 1 0 9 pK a 2 8 1 H SO4 HSeO4 SeO4 pK a 1 3 0 pK a2 1 7 Indicate predominant species for each acid base system justify your answer hawana Y VEZZO blow asinge lbsolontib

3 In the case of osmosis solvent molecules move from solution having 1 Higher vapour pressure to lower vapour pressure 2 Higher concentration to lower concentration 3 Lower vapour pressure to higher vapour pressure 4 Higher osmotic pressure to lower osmotic

2 When a non volatile solute A is added to solvent B its vapour pressure is reduced by 10 If molar mass of B is 30 of molar mass of A the mass ratio of B and A is a 0 33 c 3 0 b 6 0 d 0 66

Determine if the following salt is neutral acidic or basic If acidic or basic write the appropriate equilibrium equation for the acid or base that exists when the salt is dissolved in aqueous solution If neutral write only NR C H NH

Which of the following compounds is present in maximum percentage in Portland cement CaO SiO Al2O3

Equal volume of 0 2 N Na2SO4 and 0 1 N BaCl solutions are mixed together Assume that BaSO4 is completely insoluble If K6 H O 0 52 K kg mol what would be the normal boiling point of the resulting solution Assume molality molarity O100 15 C 100 75 C 100 091 C 100 175 C

Which of the following is are correct about the adsorption theory of catalysis A Catalysis occur through physisorption B The increase in concentration of reactants on the surface increases the rate of reaction C The heat of adsorption is utilised in enhancing the rate of reaction D The adsorbate molecules become immobile at the catalyst surface The reaction A s 2B g is in equilibrium at 4 atm and 27 C If the volume of system

If 70 g nitrogen gas is reacted with 12 g of hydrogen gas then the mass of ammonia produced in the reaction will be Options 92 g 86 g 68 g 72 g Solution Answer 3

o 2 In case if selected typed option is incorrect o 0 In case if no response is typed selected Which of the following statement are correct for the transition elements Placed from 3rd to 6th period Last electron enters into n 1 orbital exhibits variable valency General electronic configuration is n 1 d 10 ns0 2

ons A 20 litre container at 400 K contains CO g at pressure 0 4 atm and an excess of SrO neglect the volume of solid SrO The volume of the containers is now decreased by moving the movable piston fitted in the container The maximum volume of the container when pressure of CO attains its maximum value will be Given that SrCO3 s SrO s CO g K 1 6 atm 1 5 litre 3 4 litre 2 10 litre 4 2 litre Cu The solubility 1 6 x 10 10 in 6 NEET 2017 1 1 26 1 3 1 6x1 Boric acid 1 Con 2 Gi G 3 Ap 7 Whi like

Consider a certain reaction Reactant Product k 3 10 s S Calculate the concentration of reactant remaining after 2 303 s if the initial concentration of reactant is 1 0 mol L 1 1 0 mol L 1 0 35 mol L 1 0 5 mol L 1 8 2 mell 1