Physical Chemistry Questions

8 What produces more severe burns boiling water or steam 9 Name A B C D E and F in the following diagram showing chang in its state

For the MN blood group system the frequencies of M and N alleles are 0 7 and 0 3 respectively The expected frequency of MN blood group bearing organisms is likely to be 2 49 4 58 1 42 3 9

29 Iron in nature exists in three isotopic forms Fe54 Fe56 Fe57 The percentage abundance of Fe54 and Fe57 are equal and the average atomic mass of Fe is 55 95 then percentage abundance of Fe56 is 1 80 2 85

How many EDTA ethylenediaminetetraacetic acid molecules are required to make an octahedral complex with a Ca ion 1 One 2 Two 4 Three 3 Six

Which among the following will be named as dibromidobis ethylene diamine chromium III bromide 1 Cr en Br Br 3 Cr en Br Br 2 Cr en Br 4 Cr en Bra

ILLUSTRATION 14 0 6 mL of acetic acid CH3COOH having density 1 06 g mL 1 is dissolved in 1 litre of water The depression in freezing point observed for this strength of acid was 0 0205 C Calculate the van t Hoff factor and the dissociation constant of acid

Dissociation constant of acetic acid is 1 8 x 10 5 Calculate percen dissociation of acetic acid in 0 01 M solution

The I P of an atom is 16eV What are wrong values of the value of first excitation potential A 10 2 eV B 12 eV C 14 eV D 16 eV

The wrong statement is 1 Halide ligands forms high spin complex 2 Strong ligands form low spin complex 3 FeF3 is inner orbital complex 4 NiCl 2 is outer orbital complex

The freezing point depression of a 1 00 x 10 m solution of K Fe CN 6 is 7 10 x 10 3 K Determine x Given K 1 86 K kg mol 1 for H O Assume 100 dissociation

0 The correct order regarding the electronegativity of hybrid orbitals of carbon is KOM 1 sp sp sp 3 sp sp sp 1 30 2 sp sp sp J 108M 4 sp sp sp

lectronegativity radius cain enthalpy ins 92 g of molality of 4 16 ll is est ate st Experiment A in mol II 45 I III 1 5 The following results were kinetic studies of the reaction 2A B Products L 0 10 0 10 0 20 B in mol L 2 10 0 20 0 25 0 30 The time in minutes required to consume half of A is Initial Rate of reaction in mol L 1 min 6 93 x 10 3 6 93 x 10 3 1 386 10 3 1 4 100 H The alkaline earth metal nitrate not crystallise with water is 1 Mg NO3 2 3 Ca NO3 2 4 48 20 mL of 0 1 M H SO4 sol 30 mL of 0 2 M NH OH sc the resultant mixture is pK of NH OH 4 7 49 1 5 2 3 5 0 Adsorption of a ga adsorption isotherm mass of the gas ads

CuSO when reacts with KCN forms CuCN which 4 is insoluble in water It is soluble in excess of KCN due to formation of the following complex 1 K Cu CN 2 K Cu CN 3 CuCN 4 Cu KCu CN

rynil 1191 918 29lu For the toe system the value of magnetic moment is 2g miskona 1 2 83 B M 2 1 73 B M impound is not coloured TIZI T Cil DIS 3 3 87 B M 2sob gaite bis 4 4 9

Coordination compounds have great impo in biological systems In this contect which of the following statements is incorrect 1 Cyanocobalamin is vitamin B and contains 12 cobalt 2 Haemoglobin is the red pigment of blood and contains iron 3 Chlorophylls are green pigments in plants and contain calcium 4 Carboxypeptidase A is an enzyme and contains zinc

The elevation in boiling point of a solution of 13 44 g of CuCl2 in 1 kg of water using the following information will be Molecular weight of CuCl 134 4 and K 0 52 K molal 1 1 0 16 3 0 1 2 0 05 4 0 2

Which of the following compound is paramagnetic II ion 1 Tetracyanonickelate 2 Tetraamminezinc II ion 3 Hexaamine chromium III ion 4 Diammine silver I ion

88 For a reaction 2A B product rate law is given as r K A B 2 What will be the order of reaction if A is taken in excess 1 1 3 3 2 1 1 2 4 Zero

Graph of degree of dissociation a against t for reaction AB of different orders are as follows a I II 1 a The order of reaction 1 and II are respectively 1 0 1 2 1 2

For a first order reaction 2A g 2B g C g the initial pressure is P and after time t total pressure of reaction mixture becomes P The rate constant is 2 303 1 k log t 2 k In In 3 k In P 0 t 3P 2P 4 k In Po P P Po 2P P 2Po

VILLUSTRATION 15 2 g of benzoic acid CH COOH dissolved in 25 g of benzene shows a depression in freezing point equal to 1 62 K Molal depression constant for benzene is 4 9 K kg mol 1 What is the percentage association of acid if it forms dimer in solution

6 3 7R 144 cm 1 1 x eV 4 3 2x eV 9R 400 In a hydrogen atom if the energy of electron in the ground state is x eV then that in the 2nd excited state of Het is cm 1 4 2 x ev 9 9 4 x eV 4

What about degeneracy of 2p orbitals in a magnetic field 1 No degenerate orbital 2 Three degenerate orbital 3 Two degenerate orbital 4 Cannot be stated any thing about degenracy

Which of the following complex compounds does not exhibits geometrical isomerism 1 PtCl NH3 2 PdCl BrI 3 Pt NH py Cl Br 4 Pt NH Br

4 0 005 mole gives a solution of 3 0 10 mole 9 Which combination maximum buffer capacity 1 100 ml 0 1M HCN 100 ml 0 1M KOH 2 100 ml 0 1M HCN 100 ml 0 2M KOH 3 100 ml 0 2M HCN 100 ml 0 05M KOH 4 100 ml 0 2M HCN 100 ml 0 1M KOH The total number of different kind of buffer

3 A given metal crystallizes out with a cubic structure having edge length of 361 pm If there are four metal atoms in one unit cell what is the radius of one atom 1 127 pm 2 80 pm

Which of the following will give maximum number of isomers 1 Copy NH g 3 3 Fe C O en 1 2 Nien NH 4 Cr NO NH

How much heat will be released when the temperature of 1 mol of water changes from 90 C to 80 C Given Specific heat of water 4 18 J g K 1

The effective atomic number of Cr atomic no 24 in Cr NH 1 35 Cl is 2 27 3 3 33 4 36

Out of the following which complex will show geo metrical isomerism 1 Pt NH Cl 3 Na Ni CN 2 Ni CO 4 4 K Ag CN

Which one of the following high spin complexes has the largest CFSE Crystal field stabilization energy 1 Mn H O 1 3 Mn H O 13 2 Cr H O 4 Cr H O 1

34 The number of molecules present in 4 4 g of CO gas is Jipmer 1990 1 6 023 10 3 3 6 023x1024 2 5 023 10 3 4 6 023x10 2

8 2Zn O 2ZnO AG 616 J 2Zn S 2ZnS AG 293 J S 202 2SO2 AG 408 J AG for the following reaction 2ZnS 30 2ZnO 2SO is 1 1462 J 3 501 J 2 1317 J bohovnco 4 731 J

Identify the incorrect statement s a selected The ratio of the observed molar volume to ideal molar volume is called compressibility factor Z The value of van der Waals constants a and b is independent of the nature of gas At low temperature and high pressure the behaviour of any gas is explained by PV nRT ility factor 7 1 For He gas 273 K

No of total ions and resultant total charge in A B electrolyte 1 Five and 1 2 Five and 1 3 0 and 0 4 2 4 None of

The value of the spin only magnetic moment for one of the following configurations is 2 84 BM The correct one is 1 d in strong ligand filed 2 d in weak ligand filed 3 d in weak as well as in strong fields 4 d5 in strong ligand filed

For a reaction r k CH COCH3 3 2 the of reaction and rate constant respectively ar 11 1 mol L s mol 2 L2 s1 1 1 2 mol L s mol 2 L2s 1 1 3 mol L s mol 2 L2 s 1 1 4 mol Ls mol 2 L2s

In the complex Ni H O NH3 4 2 the magnetic moment u of Ni is 1 Zero 3 1 73 BM 2 2 83 BM 4 3 87 BM

Which of the following pair the EAN of central metal atom is not same 1 Fe CN and Fe NH 1 2 Cr NH 1 and Cr CN 3 FeF and Fe CN 1 4 Ni CO and Ni CN 1

5 The reaction s leading to the formation of 1 3 5 trimethylbenzene is are ai listan sdi 30 Conc H SO A A 04b0281 005 nimalo droplets 1 Br NaOH 2 H O to guinita sauso br D 3 Sodalime A C 0 B MeH Jon avond noob lood y CHO Heated iron tube 873 K bizidla OHC CHO Om to latido ort of nonenob od sdr 00 Zn Hg HCI

For FeF and Fe CN magnetic moment of the fluoride complex is expected to be 3 6 1 The same as the magnetic moment of the cyanide complex 2 Larger than the magnetic moment of the cyanide complex because there are more unpaired electrons in the fluoride complex 3 Smaller than the magnetic moment of the cyanide complex because there are more unpaired electrons in the fluoride complex 4 Larger than the magnetic moment of the cyanide complex because there are fewer unpaired electrons in the fluoride complex

The type of isomerism exhibited Rh en Cl Rh en Cl and Rh en RhCl is Dins 1 Linkage 3 Ligand 2 Coordination 4 Ionisation

If half life of a first order reaction is 2 min then the ratio of initial rate to the rate after two half lives is 1 3 IN NIT 2 2 1 2 4 4

The density of 2 M aqueous solution of NaOH is 1 28 g cm The molality of the solution is Given that molecular mass of NaOH 40 g mol 1 1 20 m 2 1 56 m 3 1 67 m 4 1 32 m

52 Which of the following graph is correct for a real gas below its critical temperature 1 3 P V 2 P 4 V V

256 For a crystal the angle of diffraction 20 is 90 and the second order line has a d value of 2 28A The wave length in A of X rays used for Bragg s diffraction is 2 2 0 4 4 00 3 2 28 Eamcet 2008 E 1 1 61

Which contains least no of molecules 1 1 g CO 2 1 g N 4 1 g H 3 1 g 0 2 Rweigh

Which of the following coordination compounds would exhibit optical isomerism 1 tris ethylenediamine cobalt III bromide 2 pentaamminenitrocobalt III iodide 3 diamminedichloroplatinum II 4 trans dicyanobis ethylenediamine chromium III chloride

surement get the accepted measured curacy of aller the nsitivity hat can ipment ling of in the is 10 2 about Sint in e least aning value 10 3 E 0 1 of e or Multiple readings of the same quantity are noted to minimize the error If the readings match closely they are said to have high precision High percision implies reproducibility of the readings High precision is a prerequisit for high accuracy Precision is expressed in terms of deviation An absolute deviation is the modulus of the difference between an observed value and the arithmetic mean for the set of several measurements made in the same way It is a measure of absolute error in the repeated observation Absolute deviation Observed value Mean Arithmetic mean of all the absolute deviations is called the mean absolute deviation in the measurements The ratio of mean absolute deviation to its arithmentic means is called relative deviation Relative deviation Mean absolute deviation Mean lue eful ris x 100 Problem 2 5 In laboratory experiment 10 g potassium chlorate sample on decomposition gives following data The sample contains 3 8 g of oxygen and the actual mass of oxygen in the quantity of

5 g of an unknown gas at 27 C and 0 2 g gas at 47 C have same volume at dihydrogen atmospheric pressure The molecular mass of the unknown gas is 1 46 8 3 46 7 2 42 6 4 50 2