Physical Chemistry Questions

4 Among Ni CO 4 Ni CN 1 NiCl 1 species the hybridization states at the Ni atom are respectively At no of Ni 28 1 dsp sp sp 3 sp dsp sp 2 sp dsp2 dsp 4 sp sp dsp

Consider the following statements Mod A S Cr NH 1 is a inner orbital complex with crystal field stabilization energy equal to 1 2 A S The complex formed by joining the CN ligands to Fe ion has theoretical value of spin only magnetic moment equal to 1 73 B M roads to visin 100 S Na S Na Fe CN NO Na 4 Fe CN NOS In reactant and product the oxidation states of iron are same and arrage in the order of true false 1 FTF 2 TTF 3 TT T 4 FFF

FeCl K Fe CN H O Precipitate The colour of the precipitate is 1 Sky blue 2 Brown A White

One mole of a non ideal gas undergoes a change of state 2 0 atm 3 0 L 95 K 4 0 atm 5 0 L 245 K with a change in internal energy AE 30 0L atm The change in enthalpy AH of the process in L atm is 2002 3M a 40 0 b 42 0 c 44 0 d not defined at constant

What will be the theoretical value of spin only magnetic moment when Fe SCN reacts with a solution containing Fions to yield a complex 1 2 83 B M 2 3 87 B M 4 1 73 B M 3 5 92 B M

K is 9 atm for the reaction LICI 3NH s LICI NH s 2NH g at 40 C How many moles of ammonia must be added at this temperature to a 5 litre flask containing 0 1 mole of LICI NH in order to completely convert the solid to LICI 3NH Multiply the obtained answer by 100 Round off the answer to the nearest integer

The EAN of cobalt in the complex ion Co en Cl is 1 27 2 36 3 33 4 35

Both Co and Pt4 have a coordination number of six Which of the following pairs of complexes will show approximately the same electrical conductance for their 0 001 M aqueous solutions 1 CoCl3 4NH and PtCl4 4NH3 2 CoCl 3NH and PtCl4 5NH3 3 CoCl3 6NH3 and PtCl4 5NH3 4 CoCl3 6NH and PtCl4 3NH3

For the reduction of silver ions with copper metals the standard cell potential was found to be 0 46V at 25 C The value of standard Gibbs energy AG will be F 96500 C mol 1 98 0 kJ 3 89 0 J 2 89 0 kJ 4 44 5 kJ

Which of the following sets is are example of co ordination isomerism in complexes 1 Co NH Cr CN and Co CN Cr NH3 2 Cr H O Cl Cl H O and Cr H O CI JCI 2H O 3 Co NH Br SO and Cr NH SO4 Br 4 Pt NH Cl and Pt NH3 4 PtCl 2

Nickel Z 28 combines with a uninegative monodentate ligand X to form a paramagnetic complex NiX The number of unpaired electron s in the nickel and geometry of this complex ion are respectively 1 one square planar 3 one tetrahedral 2 two square planar 4 two tetrahedral

The two compounds sulphato penta ammine cobil III bromide and sulphato penta ammine cobali III chloride represent 1 Linkage isomerism 2 Ionisation isomerism 3 Co ordination isomerism 4 No isomerism

nd 6 M KOH solutions by using water Practice Problem 110 4 9 g K Cr O is dissolved in 250 ml solution for the oxidation FeSO in medium Find the normality of K Cr O solution

Relative decrease in vapour pressure of an aqueous solution containing 2 moles Cu NH3 3 CI Cl in 3 moles H O is 0 50 On reaction with AgNO3 this solution will form assuming no change in degree of ionisation of substance on adding AgNO3 1 1 mol AgCl 3 0 5 mol AgCl 2 0 25 mol AgCl 4 0 40 mol AgCl

59 How many electrons 1 0 1 NA 3 8 NA are present in 1 6 gm 02 2 NA 4 10 NA

Determine the concentration of H3O ion in a solution containing 2 x 10 M HOCI and 2 x 10 M NaOCI Given Dissociation constant of HOCI 1 5 x 104 Report your answer after multiplying by 2000

66 Select ONE correct answer 3 01x1023 molecules of elemental Sulphur will react with 0 5 mole of oxygen gas completely to produce A 6 02 x 1023 molecules of SO C 3 01 x 1023 molecules of SO A SO3 C SO3 B 6 02 x 1023 molecules of SO D 3 01 x 1023 molecules of SO 3 01x1023 3 5 or four 6 02 10 3 3 01 10 3 B SO 6 02 x 10 3 D SO 3 01 x 10233

The IUPAC name of the coordination compo K3 Fe CN is 1 potassium hexacyanoferrate II 2 potassium hexacyanoferrate III 3 potassium hexacyanoiron II 4 tripotassium hexacyanoiron II

The number of naturally occurring p block elements that are diamagnetic b 6 a 18 c 5 d 7

In the complex ion ML Mn has five d electrons and L is weak field ligand According to crystal field theor the magnetic properties of the complex ion corresponds to how many unpaired electrons ion 3 2 5 3 21 1 O caning and li pritoh 4 3

1 25 g of a sample of Na CO3 and Na SO is dissolved in 250 ml solution 25 ml of this solution neutralises 20 ml of 0 IN H SO The of Na CO3 in this sample is 2016 a 84 8 b 8 48 c 15 2 d 42 4

The charge present on 42 g of nitride ions coulomb is 1 4 8 10 19 3 2 86 105 2 14 4 10 19 4 8 6 105

3 21 x mol KIO is treated with excess of KI liberates I which was dissolved in freshly prepared starch solution and it is neutralised by 60 mL 0 1 N Na2S O3 until white ppt was obtained What is x a 10 3 mol b 10 5 mol c 5 mol d 6 mol

In a ccp type structure if two atoms from corners are removed then percentage void in unit cell is approximately 1 40 21 26 2 30 4 20

In an atom has 2K 8 L 18 M and 2N in the ground state the total number of electron having magnetic quantum number m 0 is 2 10 1 6 3 7 4 14

35 What volume of 75 alcohol by weight d 0 8 g cm must be used to prepare 150 cm of 30 alcohol by weight d 0 9 g cm 3 1 67 5 ml 2 56 25 ml 4 99 9 m 3 44 44 ml

Number of oxygen molecules having weight equal to weight of 20 molecules of SC A 100 B 50 C 15 D 8

The aqueous solution that has the lowest vapour pressure at a given temperature is a 0 1 M sodium phosphate b 0 1 M barium chloride c 0 1 M sodium chloride d 0 1 M glucose

10 mL N 100 N HC 20 mL HNO 50 mL 100 N 100 H SO4 were mixed then calculate the pH of resulting solution 1 4 2 2 3 2 3 4 6

2 4 A rigid container contain 1 kg N gas at 400 K if final temeprature is 800 K then find change in entropy J K Given C 29 099 joule 2 1025 736 4 170 9 1 512 86 3 256 43

According to first law of thermodynamics which of the following quantities represents a state function a Grev c Grev Wrev b grev Wrev d Wrev

INTERCONVERSIONS OF CONCENTRATION TERMS Calculate the mole ratio of C H OH and CH OH in aqueous solution if molality of C H OH is 40 9 mole fraction of CH OH is 0 1 in solution trys

The maximum number of molecules are present in 1 15 L of H gas at STP 2 5 L of N gas at STP 3 0 5 g of H gas 4 10 g of O gas

103 A chemical reaction was carried out at 300 K and 290 K If the rate constants of the reactions are k and k respectively then a k k c k 0 125 k b k 2k d k 0 5 k

For the reversible reaction N g 3H g 2NH g At 500 C the value of Kp is 1 44 x 10 5 when partial pressure is measured in atmospheres The corresponding value of Kc with concentration in mole litre is 1 1 44 x 10 5 0 082 500 2 1 44 x 10 5 8 314 x 773 3 1 44 x 105 0 082 773 4 1 44 x 10 5 0 082 773

4 In an octahedral structure the pair of d orbitals involved in sp of hybridisation is 1 d x y dz 2 dxz d2 3 d dxz 4 dxy dyz smpia sot to600 Samole

The P E of an e in a perticular shell of H atom is 3 02 eV then calculate the radius of that perticular shell 1 4 761 3 2 116 2 8 464 4 0 529

178 Which of the following electrolytes is most effective in coagulation of gold sol SiC14 2 K4 Fe CN 6 AICI3 3 Na3PO4 o the following in the order of decreasing

Heat exchanged in a chemical reaction at the constant temperature and pressure is known as A Internal energy change C enthalpy change A A R C B entropy change D free energy change Ra B D

The temperature at which rate of reaction is doubled as that at 300 K will be 1 300 Kb 2 300 C 125 Y

10 Hydrogen a moles and iodine b moles react to give 2x moles of the HI at equilibrium The total number of moles at equilibrium is 1 a b 2x 2 a b b 2x 3 a b 4 a b X

Based on the first law of thermodynamics which one of the following is correct a For an isothermal process q w b For an isochoric process AU q c For an adiabatic process AU W

What is are correct for following reaction Zn HNO3 Zn NO3 2 NO H O A Equivalent wt of HNO3 is 84 C This is disproportionation reaction B Equivalent wt of HNO3 is 21 D 65 g of Zn consume 168 g of HNC At wt of Zn 65

3 In which following set of compound ion has linear shape 1 CH NH4 BH 3 NO CO XeF 2 CO NO4 BF 4 BeCl BC CH

1 Cis Pt en Cl Br 2H O and trans Pd en Br C1 2H O are 1 Ionisation isomer 2 Geometrical isomer 3 Hydrate isomer 4 None of these

4 In which of the following change observed energy represent first ionisation energy of given element 1 Na s Nag 2 3 Mg g Mg2 g 2 F2 g F g 1 2 4 Cl g Cl g

The half life of a first order reaction is 30 min The time required for 75 completion of the same reaction will be A 45 min 30 13 75 off B 60 min C 75 min D 90 min

The total number of neutrons in 36 mL of H O l or water are 1 3 NA 3 24 NA 2 30 NA 4 16 N

10 6 Some relations of Cp and Cy for an ideal gas i Internal energy U of an ideal gas depends only on the temperature T neither on the pressure P nor the volume V When an ideal gas undergoes a process involving only P V work the heat absorbed by the gas is equal to its internal energy change Therefore for an ideal gas C 89 du or dU Cydr

PCI g is 40 dissociated when pressure is 2 atm It will be 80 dissociated when pressure is approximately 1 0 2 atm 3 0 8 atm 2 0 5 atm 4 0 6 atm