Physical Chemistry Questions

Which of the following electron transitions in a hydrogen atom will require the largest amount of energy 1 from n 1 to n 2 2 from n 2 to n 4 3 from n 5 to n 1 4 from n 3 to n 5

Which of the following solution has maximum vapour pressure 1 1 1 N KNO3 31 N AL SO 2 I in add II 1 5 3 2 1 N Ba NO 2 4 IN Ti NO 5 in KL solution The freezing

1 mol PCI is heated in a closed container of 1 L capacity At equilibrium 20 PCl is not dissociated what should be the value of K C 1 3 2 2 2 4 3 4 2 4 1 4

If the ionization energy of He is per atom then the energy of Be ion in the second 34 stationary state is 1 4 9 x 10 18 J 2 44 1 x 10 18 J 3 11 025 x 10 18 J 4 None of these

Which of the following geometrical isomerism 1 Co NH Cl lt 3 Cr en 1 complex does no show 2 Co NH NO 4 Pt gly

If the masses of Cr and O are in the ratio 13 12 in CrO3 then the ratio of O that combines with the same mass of Cr in Cr O3 and Cr O is 1 1 2 3 37 2 1 4 4 25

13 What is the mass of a molecule of CH 1 16 g 2 26 6 x 1022 g 3 2 66 x 10 23 g 4 16 Ng uing has the highest mass 11

At 60 C dinitrogen tetroxide is fifty percent dissociated Calculate the standard free energy change at this temperature and at one atmosphere

In a reaction A g 4B g 2AB g AH 0 The formation of AB g will be favoured by 1 Low temperature and high pressure 2 High temperature and high pressure 3 Low temperature and low pressure 4 High temperature and low pressure

Which of the following represent the first excited state of sulphur 1 1 111 2 1 111 3 1 111 4 1 1 1 1 11

The pKa of HCN is 9 3 The pH of a solution prepared by mixing 2 5 mol KCN and 2 5 mol HCN in water and making up to total volume to 500 mL is 1 9 3 2 7 3 3 10 3 4 8 3

The solubility product of CaSO is 2 4 x 10 When 100 mL of 0 01 M CaCl and 100 mL of 0 02 M Na SO are mixed then 1 Na SO will precipitate 2 Both will precipitate 3 CaSO will precipitate 4 None will precipitate

The values of electronegativity of atoms A and B are 1 2 and 4 0 respectively The ionic character of the A B bond is DPMT 2009 b 72 24 d 4 3 a 50 c 55 3

In a 0 25 L tube dissociation of 4 mol of NO is take place If its degree of dissociation is 10 The value of K for reaction 2 NO N O is 1 1 18 2 1 8 3 1 16 4 1 32

Example 1 If we have 6 w w urea solution with density 1 060 g mL then calculate its strength in

0 8 18 If 10 g of an unknown substance non electrolyic is dissolved to make 500 mL of solm 300 K is observed to be 1 23 atm find m wt

The anode is the oxidising electrode by which electrons leave the electrolyte Loss of electrons from an atom or ion is called oxidation hence

One mole of an ideal gas expands freely and isothermally at 300 K from 10 litres to 100 litres If AU 0 the value of AH is b 200 kJ d 300 kJ a 10 kJ Loke Zero

3 In an isulated container water is stirred with a rod to increase the temperature Which of the following is true 1 AU W 0 q 0 3 AU 0 W q 0 2 AU W q 0 4 W 0 AU A

Supposing the I P of H atom is 800 eV Find out the valve of principle quantum number having the energy equal to 50 eV 1 n 2 2 n 3 3 n 4 4 n 1

1 575 g of oxalic acid COOH 2 xH O are dissolved in water and the volume made upto 250 mL On titration 16 68 mL of this solution requires 25mL of N 15 NaOH solution for complete neutralization Calculate x

Find exothermic reaction 1 F F e 2 F Cl F Cl 3 Xe He Xe He 4 O 2e00

If a mixture of gases has a total pressure of 100 cm in the Hg and the partial pressure of nitrogen mixture is 25 mm Hg then the per cent of nitrogen in the mixture is a 4 b 40 c 400 d 2 5

In the light of Le Chatelier principle 1 an endothermic reaction is facilitated at high temperature 2 an exothermic reaction is facilitated at high temperature 3 a gaseous reaction A2 3B 2AB3 is facilitated at low pressure 4 a gaseous reaction A2 B2 2AB is facilitated at high pressure

Final pH of the solution obtained on mixing 100 ml 0 01M HCI and 100 ml 0 01M CH3COOH Ka 10 5 is log5 0 7 1 2 3 3 4 3 2 3 7 4 4 5

Chemistry 36 K of Sr OH is x then calculate value of OH in saturated solution 1 3x 4 3 x 2 2 2 4 4 X

Na Amalgam is prepared by electrolysis of aq NaCl solution using 10 gm Hg cathode How many Faraday s of electricity is required to prepare 18 7 Na Amalgam current Eff 50 x 10 A 0 081 F B 0 16 F C 0 2 F D 0 1 F 2 TAI 2 10 x 2 3 Sam2 mol 1 at infinite

In a sample of NH3 g 18 x 1022 atoms of hydrogen are present then find out the volume of NH g at STP 1 2 24 L 3 4 48 L 2 1 12 L 4 6 72 L

60 mL 0 1 M KMnO4 is treated with excess of FeC 0 n presence of H SO4 The volume of CO gar measured at STP obtained is 1 448 mL 3 224 mL 2 672 mL 4 112 mL

For the reaction PCI g PC13 g Cl g the forward reaction at constant temperature of favoured by 1 Introducing an inert gas at constant volume 2 Introducing Cl gas at constant volume 3 Introducing an inert gas at constant pressure 4 None of the above

84 Consider two reactions 1 and 2 having energies E and activation E respectively When the temperature is changed from 400 to 450 K the rate constant for the first reaction changes from k to kand that for the second reaction changes from k to k If E E then which of the following expressions is true for the reactions a K K K K b K K 1 k

3 Zn reduce Mg2 4 Zn reduces Fe2 2 Deduce from the following E values of half cells what combination of two half cells would results in a cell with the largest potential I A eA E 0 24 V II BO eB III C 2e C iv D 2e D 1 II IV 3 III IV E 1 25 V E 1 25 V E 0 68 V 2 II III 4 I II all reaction

4 56 1 dm solution containing 105 moles each of Cl ions and CrO2 ions is treated with 10 4 moles of silver nitrate Which one of the following observations is made Ksp Ag 2CrO4 4 10 Ksp AgCl 1x 10 101 a Precipitation does not occur b Silver chromate gets precipitated first c Silver chloride gets precipitated first d Both silver chromate and silver chloride

31 In which of the following case pH is greater than 7 1 50 ml of 0 1 M HCI 50 ml of 0 1 M NaCl 2 50 ml of 0 1 M H SO4 50 ml of 0 2 M NaOH 50 ml of 0 1 M CH3COOH 50 ml of 0 1 M KOH LOT 4 50 ml of 0 1 M HNO3 50 ml of 0 1 M NH3

7 A gas deviates from ideal behaviour at a high pressure because its molecules a attract one another b show the Tyndall effect c have kinetic energy 1 bu noualent bonds

The weight of one molecule of a compound C6H122 is 60 1 1 2 x 10 20 gm 2 1 4 x 10 21 gm 3 5 025 x 10 3 am

1 mole heptane V P 92 mm of Hg is mixed with 4 mol Octane V P 31 mm of Hg from an ideal solution Find out the vapour pressure of solution

solute per 100 mL was found to have an osmoti pressure equal to 500 cm of mercury at 27 C Th molecular weight of the solute is 1 14 99 g 2 149 9 g 3 1499 g 4 1 499 g

9 The atomic weight of a metal M is 27 and its equivalent weight is 9 the formula of its chloride will be 1 MCL 3 M Cl 2 MC1 4 MCL3

21 Given the bond dissociation energies below in kcal mole estimate the AH for the ary carbon e quaternary carbon propagation step CH 3 2 CH Cl2 CH 3 2 CHCl Cl A 98 CH3CH2CH2 H CH3 2 CH H Cl Cl H Cl CH3CH2CH2 Cl CH3 2 CH Cl a 30 kcal mole c 40 kcal mole CM3 CM 2 95 58 103 aniq Indic 81 80 b 22 kcal mole d 45 kcal molo 45 We ala 85

2 76 g of silver carbonate on being strongly heated yields a residue weighing Ag CO 2Ag CO 2O 2 2 2 48 g 4 2 64 g 1 2 16 g 3 2 32 g

3 Main axis of a diatomic molecule is z orbital p and p overlap with each other to form which of th following molecular orbitals 1 molecular orbital 2 o molecular orbital 3 8 molecular orbital 4 No bond will form

Which reaction does not involve neither oxidation nor reduction 1 VO V 03 3 Cro2Cr 0 2 Na Na 4 Zn Zn

Arrange the following molecules in the increasing order of their ionic character 2 Points LiF K O N SO2 Cu LiF K 0 N SO CIF3 N K 0 LiF SO CIF3 N K 0 LiF CIF3 SO

UMP 5 A glass bulb of 1 litre capacity contains 2 10 1 molecules of nitrogen exerting pressure of 7 57 x 10 Nm 2 Calculate the root mean square speed and the temperature of gas molecules If the ratio of up to Urms is 0 82 calculate up for these molecules at this temperature IIT 1993

disproportionation reaction Cr 0 1 CrO5 2 103 I H I 3 CrO Cl NaOH Na CrO4 NaCl H O 4 Na S O3 H SO4 Na SO4 SO2 S8 H O

6 Which of the following statements is incorrect a Pure sodium metal dissolves in liquid ammonia to give blue solution b NaOH reacts with glass to give sodium silicate c Aluminium reacts with excess NaOH to give Al OH 3 d NaHCO on heating gives Na CO3

for the cell at 298 K Ag s I AgCl s CH aq AgNO aq Ag s Which of following is correct A The cell emf will be zero when Ag in anodic compartment Ag in cathodic compartment B The amount of AgCl s precipitate in anodic compartment will decrease with the working of the cell C The concentration of Ag constant in anodic compartment during working of cell 0 059 1 Scanned with ACE AU log CamScanner 1 CI 1

5 Solubility of Ba OH in pH 11 is 10 8 What the solubility product of Ba OH 2 1 10 11 2 10 14 3 10 9 4 10 12

molarity 1000 1000xd molarity xm late molarity of CaCO aq solution which has concentration of CaCO molality 200 p