Physical Chemistry Questions

Solution of chloroform and acetone is an example of maximum boiling azeotrope A doctor advised a person suffering from high blood pressure to take less quantity of common salt State Raoult s law for the solution containing non volatile solute Give its mathematical expression also

Consider the following first order competing reaction A B and Y C Dif 50 of the reaction of X was completed when 96 of the reaction of Y was completed the ratio of their rate constants k k is Options 1 4 06 2 0 215

At 298 K and 1 bar partial pressure of hydrogen gas the half cell reduction potential of hydrogen electrode is equal to 0 30 V at pOH Take 2 303RT F 0 06 V at 298 K

6 The following data were obtained during the first order thermal decomposition of SO Cl at a constant volume SO Cl SO Cl Experiment 1 2 Calculate the rate of the reaction Time S 0 100 Total Pressure atm 0 5 0 6

a 4 12 1 5 Each edge of a cubic unit cell is 400 pm long If atomic mass of the element is 120 and its 23 density is 6 25 g cm the crystal lattice is use N 6 102 A a primitive b body centered c face centered d end centered Tungsten has an atomic radius of 0 136 nm The density of tungsten is 19 4 g cm What is the

The ratio of the rate constant of a reaction at any temperature T to the rate constant T is equal to Options 1 Energy of activation of the reaction 2 Fraction of molecules in the activated state 3 Average life of the reaction 4 Pre exponential factor in the Arrhenius equation

22 In the face centered cubic unit cell the radius of atoms in terms of edge length a of unit cell a a 2 b a 2 c a 2 2 d 3a 4 23 The fraction of volume occupied by atoms in a primitive cubic unit cell is nearly

In a binary solution of A PA 700 torr and B PB 500 torr if A and B were added in molar ratio of 2 3 then vapour pressure of B in the solution will be tions 280 torr 300 torr 580 torr 680 torr

The equilibrium constant K is related to E cell and not El Conductivity of an electrolytic solution decreases with the decrease in concentration What is a fuel cell What is its main advantage What are the reactions occuring at the Cathode and Anode of a Leclanche cell

The type of electrode Pb PbSO4 s H SO4 used in acid storage cell is 1 Metal electrode 42 2 Non metal electrode 3 Metal insoluble salt anion electrode dalom 00 3 Mo 4 Oxidation reduction electrode 0 Her

of all gases contain equal number of atoms at same temperature and pressure This statement is 1 In accordance with Dalton s atomic theory and is known as Berzelius Hypothesis 2 Not in accordance with Dalton s atomic theory and is known as Avogadro s Hypothesis 3 Not in accordance with Dalton s atomic theory and is known as Berzelius Hypothesis 4 In accordance with Dalton s atomic theory and is known as Avogadro s Hypothesis

nsition series spectrum Wavenumber 109677 1 n1 2 1 n2 2 Is n1 always smaller than n2 Cant this val ue be negative When the energy is absorb ed can this value be negative as the electro n is jumping from lower energy level to high er energy level

an the 3 Electrop 15 Tyndall effect is not observed in 16 2 True solution 4 Colloidal solution 1 Suspension 3 Emulsions The process of removing dissolved impurition

23 pH of a saturated solution of Ba OH is 12 The value of solubility product Ksp of Ba OH is D AIPMT Prelims 2012 1 4 0 10 6 3 3 3 10 7 2 5 0 10 6 4 5 0 10 7 8

9 The colligative property of a colloidal sol compared to the solution of non electrolyte of same concentration will be 1 Same 3 Lower C 11 2 Higher 4 Higher or lower BRICACE

Use the following information to answer the question below Free Energy A B Od OC Ob d Progress of the Reaction The figure illustrates the energy states associated with the reaction A B C D Which of the following represents the delta G for non enzyme catalyzed reaction in the figure CU C D

Acetic acid is obtained when 1 glycerol is heated with sulphuric acid 2 methyl alcohol is oxidized with potassium permanganate 3 acetaldehyde is oxidized with potassium dichromate and sulphuric acid 4 calcium acetate is distilled in presence of calcium formate

22 The advantages of fuel cells include 1 they can be recharged by the addition of more material to be oxidized and or reduced 2 they can be made to produce little or no harmful pollutants 3 they can be made to run very quietly 4 all of the above

h of the following occupies maximum volume at NTP 02 x 1022 molecules of CO i 8 g of oxygen iii 17 g of NH iv 0 2 mol of N

1 5 mixture of SiO and Fe2O3 on very strong heating leave a residue weighing 1 46 gm The reaction responsible for loss of weight is Fe2O3 s Fe3O4 s O g What is the percentage by weight of Fe O3 in original sample a 80 b 20 c 40 d 60 Three mole of potassium chlorate KC103 is thermally decomposed and excess of aluminium Al is burnt in the gaseous product How many moles of aluminium oxide Al O3 are formed

Consider following chemical reactions Br Answer km ka Br HBr HBr Br If k 8x102 min km 2x102min n then percentage of products with a chiral carbon atom will b

The standard enthalpy of formation of H O g at 300 K is 57 8 kcal mol Calculate AH at 400 K Given Cp H O g 7 2 5 x 10 T Cp Hg g 7 2 x 104T Cp O g 6 4x103T Cp are measure in units of cal K mol 1 58 08 kcal 2 50 6 kcal 2 333 3 kcal 4 7131 2 cal

What is the molality of the solution of a certain solute in a solvent if there is a freezing point depression of 0 184 and if the freezing point constant is 18 4 K kg mol 1 0 01 2 1 00 3 0 001 4 100

The rate of decomposition of NH3 g at 10 atm of platinum surface is zero order What is rate c formation in M min of H g if rate constant of reaction 2NH3 g N2 g 3H2 g is 2 0 M min 1 h

5 When cells of skeletal vacuoles of a frog were placed in a series of NaCl solutions of different concentrations at 25 C it was observed micro scopically that they remained unchanged in 0 7 solution shrank in more concentrated and swelled in more dilute solutions Water in 0 7 salt solution freezes at 0 406 C What is the osmotic pressure in atm of the cell cytoplasm at 25 C Kf for water 1 86 K kg mol

Following represents equation of state for n moles of real gas 0 a is expressed in atmL mol 2 b is expressed in Lmol 0 At high pressure compression factor z is Constant a is a measure of force of attraction among gas molecules and n a V Pb RT n a V V nb nRT Select correct statements is called pressure correction term Volume correction is due to finite size of molecules and pressure correction is due to force of attraction between molecules

30 Gold has a face centered cubic lattice with an edge length of the unit cube of 407 pm The diameter of the gold atom is c 352 5 pm d 704 9 pm a 576 6 pm b 287 8 pm 31 The neon atoms has a radius of 160 pm What is the edge of the unit cell of a face centered

In the electrolysis of concentration H SO4 solution 11 2 LH gas at 0 C and 1 atm is liberated at the cathode and 19 4 gm H S2Os is produced in the solution The volume in 7 at 27 C and 0 821 atm of O gas simultaneously liberated at the anode is 6

pH of 0 1 M HA solution is 1 70 and pH of 0 2 M HB solution is 1 00 at 25 C Here HA and HB are weak monobasic acids Value of 10 HB Take log10 2 0 30 Here HA and HB are osmotic pressures of the solution of HA and HB respectively is

21 KMnO4 can be prepared from K MnO4 as per the reaction 3MnO2 2H O 2MnO4 MnO 40H 4 obnolio The reaction can go to completion by removing OH ions by adding NEET 2013 1 KOH 3 SQ noliuloa ispit ed 2 CO 4 HCI

Five ionization energy values in kJ mol are listed below E 870 E 830 E3 1010 E4 1290 E5 376 These are a successive ionization energies for the element with atomic number 5 b the first I E of successive elements in group 15 16 17 18 and 1 respectively c the first I E of elements with atomic number 1 to 5 d successive I E for transition elements with four electrons in d subshell

Equal volumes of following solutions are mixed in which case the pH of resulting solution will be average value of pH of two solutions A pH 2 HCl and pH 12 NaOH B pH 2 HCl and pH 4 HC1 C pH 2 HCN and pH 12 NaOH Ka of HCN 10 0 D pH 5 CH3COOH and pH 9 NH3 aq Ka CH3COOH Kb NH3 aq

a cubic b tetragonal c monoclinic 16 In the primitive cubic unit cell the atoms are present at the a corners of the unit cell c centre of each face of the unit cell 17 In the body contored contored unit gall 1 d rhombohe b centre of the unit cell d one set of faces of the unit cell

Compound x have its observed weight in a magnetic balance more than its actual weight determined by using a non magnetic balance Number of compounds from the following list which can be compound x are MnO Fe O4 CrO Mn NaC1 ZnS Answer Enter your answer here

Consider the following reaction 2Fe2O3 s 3C s 4Fe s 3CO g AH of Fe O3 CO2 are 820 kJ mol and 390 kJ mol respectively The reaction is Endothermic Exothermic Spontaneous at high temperature Spontaneous at low temperature

19 The effective number of atoms per unit cell in a simple cube face centred cube and body centred cube are respectively a 1 4 2 b 1 2 4 c 8 14 9 d 8 4 2 20 What would be the effective number of atoms per unit cell in end centered cubic unit call if

2 An ideal gas in a thermally insulated vessel at internal pressure P volume V and absolute temperature T expands irreversibly against zero external pressure as shown in the diagram The final internal pressure volume and absolute temperature of gas are P2 V and T2 respectively For this expansion Pext 0 P V T Irreversible Thermal insulation Pext 0 P2 V2 T2

CI 39 The equivalent conductances of Ba 2 and are 127 and 76 2 cm 1 cm eq respectively at infinite dilution The equivalent conductance of BaCl at infinite as dilution will be CBSE AIPMT 2000 a 139 52 b 203 c 279 d 101 5

How much heat is required to raise the temperature of 1 mole of oxygen gas from 27 C to 127 C at 1 atm pressure Given Cp 6 3 25 x 10 3 T 1 x 10 6 T2 cal K 1 mol 1 0 7 kcal 3 2 8 kcal 2 1 4 kcal 4 1 kcal

Carefully observe the following figure and answer the questions that follow Ag Battery Ag Agt Spoon AgNO3 aq i Write what you will observe after allowing the current to pass through this electrolyte for 20 to 30 minutes ii Write two practical applications of the process depicted in the

NEET 2017 3 The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As S3 are given below I NaCl 52 II BaCl 0 69 III MgSO 0 22 The correct order of their coagulating power is a I II III c III II I b II I III d III I II NEET II 2016 10

a Describe an activity to prove that liquid pressure at the bottom of a container depends upon the height of the water column above that point Also draw the related diagram b Write the effects of force in the following cases 1 squeezing a rubber ball between palms by applying the same force from both sides 2 a batsman hitting a cricket ball for a six

15 The crystal system of a compound with unit cell parameters a 0 328 nm b 0 328 nm c 0 527 nm and a y 90 is a cubic b tetragonal c monoclinic 16 In the primitive cubic unit cell the atoms are present at the d rhombohed

unit cell d one set of faces of the 17 In the body centered unit cell the lattice points are present at the a corners of unit cell only b corners and centre of unit cell c corners and centre of each face of the unit cell d corners and at one set of faces of unit cell In the face contored unit noll the lottion n

Electrolysis of an acetate solution produces ethane according to the Kolbe reaction 2CH COOC H 2CO 2e What volume in L of ethane is produced at 27 C and 760 mm Hg if a current of 0 500 A were passed through the solution for 10 hours and the electrode reaction is 96 5 efficient 6

2 4 1 0 The rise in boiling point of a solution containing 1 8 g glucose in 100 g of a solvent is 0 1 C The molal elevation constant of the liquid is A 1 Cm C 3 Cm A A B B B 2 Cm D 4 Cm You Missed

MeCOOEt i NH NH ii HNO iii OH B C Which of the following statements are correct about the given reactions sequence a The compounds B and C respectively are Me N C 0 and MeNHCOOMe MeOH b The compounds B and C respectively are Et N C 0 and MeNH c The reaction proceeds via the formation of acyl nitrene MeCON as the intermediate species d The reaction proceeds via the formation of acyl nitrene E CON as the intermediate species

The solubility product of BaCl2 is 4 x 109 what will be solubility in mol litre 1 3 4 Correct Answer 3 Your Answer 4 Status incorrect 4x10 3 3 2 10 9 1 10 3 1 10 9 Add to Bookmark List Volume of solution by mixing 40 ml CC14 and 50 ml benzene will be Your Answer 3

a 0 4 4 Dinitrodiphenyl is obtained when 4 nitrochlorobenzene is heated with Na ether b 4 nitroiodobenzene is heated with copper powder in a sealed tube c diphenyl is heated with a mixture of conc HNO3 conc H SO4 d nitrobenzene is treated with 4 nitro chlorobenzene in presence of anhyd AlCl3

On which of the following properties does the 6 Which F coagulating power of an ion depend a The magnitude of the charge on the ion independe a Elect alone c Coag b Size of the ion alone c Both magnitude and sign of the charge on the ion d The sign of charge on the ion alone of the following NEET 2018 7 Which p on the c a Coa