Physical Chemistry Questions

The volume of a drop of water is 0 0018 m then the number of water molcules present two drops of water at room temperatue is 1 12 046 x 1019 2 1 084 x 1018 3 4 84 x 10 7 4 6 023 x 1023

5 Co CN a complex ion of cobalt 1 aberts radiation in violet region of the visible light Its aqueous solution therefore appear 1 Pink 3 Blue 2 Orange 4 Yellow

18 There is no scum formation when hard water is being used The washing powder can be 310 sidh a C HCOONa rozd b R O Ves c both of these SO Na RockT d none of these

4 perature log 2 0 3 Calculate pH of following solutions a 0 1 M HCl b 0 1 M CH COOH K 1 8 x 10 5 log 1 8 0 13

ii 7 of silk The scientific name of mulberry plant is Pupa of silk moth is called and

For the coagulation of 500 mL of arsenious sulphide sol 2 mL of 1 M NaCl is required What is the flocculation value of NaCl

Composition of the equilibrium mixture Cl 2CI which is attained at 1200 C is determined by measuring rate of effusion through a pin hole It is observed that at 1 80 mm Hg pressure the mixture effuses 1 16 times as fast as Krypton effuses under the same conditions Calculate the fraction of chlorine molecules dissociated into atoms IIT 95 Relative atomic mass of Kr 84

71 Oxidising product of substance Na AsO would be 2 AsO 4 AsO 1 As 0 3 AsO 4

0 01 M HA aq is 2 ionized solution is 1 2 x 10 4 2 10 8 3 2 x 10 11 4 2 10 12 vijesno toenting VEG

4 O ions are arranged in ccp in a spinel structure ions occupy 1 8 of TVs and B ions occupy half of OV The void volume of unit cell 0 11 A Find the value of A

a Methanol a liquid fuel that could possibly replace gasoline can be prepared from water gas and additional hydrogen at high temperature and pressure in the presence of a suitable catalyst Write the expression for the equilibrium constant for the reversible reaction 2H g CO g CH OH g AH 90 2 kJ Assume that equilibrium has been established and predict how the concentration of H CO and CH OH will differ at a new equilibrium if 1 more H is added 2 CO is removed 3 CH OH is added 4 the pressure on the system is increased 5 the temperature of the system is increased 6 more catalyst is added on of steam

How many metallic ores are concentrated by magnetic separation method from the given ores Cassiterite Pyrolusite Rutile Magnetite Galena Cinnabar

111 The dispersed phase in colloidal iron III hydroxide and colloidal gold is positively and negatively charged respectively Which of the following statements is not correct b a Mixing the sols has no effect nonjetal Mon Sbirl 08 b Coagulation in both sols can be brought about by Ons 16000 12 201 011 6 electrophoresis aquest c Magnesium chloride solution coagulates the gold sol more readily than the iron III hydroxide sol d Sodium sulphate solution cause coagulation in both QUOND sols TISDIONOS DITS SLL mod c d 120 It 121

5 Statement 1 Statement 2 In water orthoboric acid behaves as a weak monobasic acid In water orthoboric acid acts as a proton donor 105 A Statement 1 is True Statement 2 is True Statement 2 is a correct explanation for Statement 1 B Statement 1 is True Statement 2 is True Statement 2 is NOT a correct explanation for Statement C Statement 1 is True Statement 2 is False D Statement 1 is False Statement 2 is True

The pressure in a bulb dropped from 2000 to 1500 mm of Hg in 47 min when the contained oxygen leaked through a small hole The bulb was then evacuated A mixture of oxygen and another gas of molar mass 79 in the molar ratio of 1 1 at a total pressure of 4000 mm of Hg was introduced Find the molar ratio of two gases remaining in IIT 81 the bulb after a period of 75 min

A 1 These plots respectively correspond to the reaction orders a 0 2 1 1 0 2 c 1 1 2 b 0 1 2 17 If decomposition reaction A g B g follows first order kinetics then the graph of rate of formation R of B against time t will be

D 1 shaped Statement 1 p Hydroxybenzoic Statement 2 o Hydroxybenzoic acid has a lower boiling point than o hydroxybenzoic acid acid has intramolecular hydrogen bonding A Statement 1 is True Statement 2 is True Statement 2 is a correct explanation for Statement 1 B Statement 1 is True Statement 2 is True Statement 2 is NOT a correct explanation for Statement 1 C Statement 1 is True Statement 2 is False D Statement 1 is False Statement 2 is True

E Pb Pb 0 13V Is cell representation is correct At what concentration of Cu in a solution of CuSO4 will the electrode potential be zero at 25 Given E Cu Cu 0 34 V

2 In a reaction container 100 g of hydrogen and 100 g gas What of Cl are mixed for the formation of HCl is the limiting reagent and how much HCl is formed in the reaction est a H is limiting reagent and 36 5 g of HCl are formed b sdW d Cl is limiting reagent and 102 8 g of HCl are formed c H is limiting reagent and 142 g of HCl are formed Cl is limiting reagent and 73 g of HCl ar formed

c In the reactions where enthalpy value determination is difficult by experiments the enthalpy value can be calculated by a Kirchoff s equation b Hess s law ROT c Henry s law d van t Hoff law ai norism to 10 baste sil

0 05 g of a commercial sample of KCIO3 on decomposition liberated just sufficient oxygen for complete oxidation of 20 mL CO at 27 C 750 mm pressure Calculate of KClO3 in the sample

3 For two reactions in equilibrium in same container 1 A s 2B g C g Kp 27 atm 1 D s 2B g E g K 81 atm Pressure of B g at equilibrium will be 1 6 atm 2 3 atm 3 5 atm 4 9 atm

1 of the vessel is reduced to of its original volume 3 the rate of the reaction will 1 Increase 27 times 2 Remain unaltered 3 Increase 9 times 1 Decrease 3 times

6 The given graph shows the vapour pressure temperature curves for some liquids V P A B D TI Liquids A B C and D respectively are a diethyl ether acetone ethyl alcohol water b acetone ethyl alcohol diethyl ether water c water ethyl alcohol acetone diethyl ether d ethyl alcohol acetone diethyl ether water

Elements after atomic number 103 have not been discovered till now If an element with atomic number 106 were ever discovered which of the following electronic configuration will it possess AIIMS 1982 a Rn 5f 4 6d4 7s c Rn 5f 4 6d 7s b Rn 5f 4 6d 7s d Rn 5f 4 6d 7s 7p

The above experiment is done at NTP The stop cock is opened for certain time and then closed After effusion the bulb A contains 0 1 gm of D Find out the number of mole of H in bulb B Balloon A is inserted in balloon B at 300 K Maximum 1 12 It D 2 24 It H B evacuated

The freezing point of a 4 aqueous solution of A is equal to the freezing point of 10 aqueoust solution of B If the molecular mass of A is 60 then the molecular mass of B will be

K value for C H H C H is 5x10 8 atm and K for C H H C H is 5 x 1026 atm at 50 C P Calculate K for the reaction 2H C H C H6 1 2 5 1045 3 1 5 x 10 45 2 21 108 4 2 5 x 10 45

During an adiabatic expansion of 2 moles of a gas the change in internal ene ound to be equal to 100J The work done during the process will be equal to 42 100 J 4 100 J zero 3 200 J

Calculate H H PO HPO2 and PO3 in a 0 01M solution of H PO4 Take K 10 K 10 8 K 10 13 HO

Depression on freezing point of 0 01 molal aqueous HCOOH solution is 0 02046 1 molal aqueous urea solution freezes at 1 86 C Assuming molality equal to molarity pH of HCOOH solution is

a Nig 15 x m OV temperature constant 612975031 rigid at tai 29 Boob P x m 31 G temperature constant B P A Which is correct statement a A represents Freundlich s adsorption isotherm while B represents Langmuir s adsorption isotherm b A represents Langmuir s adsorption isotherm while B represents Freundlich s adsorption isotherm c Both Freundlich and Langmuir adsorption isotherms have been found to be applicable in the adsorption of gases on solids only WOLFARIN d Change of pressure affects a lot and further adsorption

Molality of 1M solution of NaNO solution Density of solution is 1 25 g mL and mol wt of NaNO 85 g mol is a 1 286 m 19 en viena b 4 44 m b 4 44 mondo d None of these da SE 1 0 c 0 858 m 1 6 6 x II

4 For two gases A and B with molecular weights MA and MB it is observed that at a certain temperature T the mean velocity of A is equal to the root mean square velocity of B Thus the mean velocity of A can be made equal to the mean velocity of B if a A is at temperature T and B at T T T b A is lowered to a temperature T T while B is at T c both A and B are raised to a higher temperature d both A and B are placed at lower temperature

In which of the following complexes in the bond order of C O is minimum 1 Mn CO 3 Ti Co 2 Cr CO 4 V Co

i An equimolar solution of NaNO and HNO can act as a Buffer solution ii Between Nat Agt ion Ag is a stronger Lewis acid iii Salts of strong acids and weak bases undergo cationic hydrolysis 2 iv If the salts M X QY and PZ have same solubilities 1 their Kvalues are related M X QY PZ3 Select the correct code for above A TFTT B FTFT C TTTT D FTTT

One mole of A reacts with one mole of B to form 0 1 mole of C and 0 1 mole of D What will be the value of the equilibrium constant 1 0 01 2 100 4 81 3 1 81

3 A vessel of volume 10 L is evacuated by means of a piston air pump One piston stroke captures the volume 1 L The process is assumed to be isothermal and the gas is ideal The initial pressure of gas in the vessel was 24 2 atm Select the correct statement s from the following a The pressure of gas remained in the vessel after first stroke is 22 atm b The pressure of gas remained in the vessel after second stroke is 20 atm c The number of strokes needed to reduce the In n In 1 1 pressure in the vessel n times is d The pressure of gas remained 10 after n strokes is 24 2 x n in the vessel atm

emf of the cell be zero to the reduction 1 The standard electrode potential corresponding 3 Cr e Cr is E 0 407 volt If excess Fe s is added to a solution in which Cr 1 M what will be Fe when equilibrium is established at 25 C Fe 0 42 M 2 Fe s 2Cr Fe 2Cr

A 5 B 4 C 3 The oxidation states of the most electronegative element in the products of the reaction of BaO with dilute H SO4 JEE 1991 A 0 and 1 For the redox reaction B 1 and 2 C 2 and 0 D 2 and 2 JEE 1992

46 A fully charged lead storage battery contains 1 5 L of 5 M H2SO4 During discharging of lead storage acid battery following reaction takes place Pb s PbO2 s 2H2SO42PbSO4 s 2H O If 2 5 A of current is drawn for 965 min H SO4 consumed in moles is

4 08g of a mixture of BaO and unknown carbonate MCO3 was heated strongly The residue weighing 3 64g was dissolved in 100mL of 1 N HCl The excess acid required 16mL of 2 5 N NaOH solution for complete neutralisation Identify the metal

Which of the following compounds will show highest dipole moment JEE MAINS 2017 Onli I Dan m O II CUIT O IV O

Which one of the following form maximum boiling point azeotrope 1 CHCl3 C H5OH 3 Benzene toluene 2 Ethanol water 4 HCI water

52 In which of the following reaction H O acts as reducing agent 1 2FeCl 2HCl H O 2FeCl3 2H O 2 2 Cl H O 2HCl O 3 2HI H O 2H O 1 2 4 H SO H O H SO H O

64 For which of the following molecule significant 0 CI 1 fo CI 5 1 Only 3 Am 2 CN CN 2 3 and 4 3 OH OH 3 Only 1 SH J 4 PUT SHOOD JAB 4 1 and 2

How many moles of Ca3 PO4 2 will contain 0 20 mol of oxygen atoms How many gm of HCI is needed for complete reaction with 69 6 g MnO HCI MnO MnCl H O Cl

7 Silver atomic weight 10 g mol has a density of 10 5 g cm The number of silver atoms on a surface of area 10 12m can be expressed in scientific notation as y 10 The value of x is a 3 b 5 c 7 d 9

The equivalent conductivity of KCl at infinite dilution is 130 S cm eq The transport number of Cl ion in KCl at the same temperature is 0 505 The limiting ionic mobility of K ion is a 6 67 x 104 cm s V 1 b 5 01 x 10 3 cm s V 1 c 3 22 x 10 cm s V 1 d 2 00 x 104 cm s 1 V 1

150 mL of 0 0008 M ammonium sulphate is mixed with 50 mL of 0 04 M calcium nitrate The ionic product of CaSO will be 4 K 2 4 x 10 5 for CaSO4 sp 1 K 2 K sp sp 3 K sp 4 None of these assd sticend vhoqanov p valsdial 2 pristni