Physical Chemistry Questions

3 moles of an ideal gas at 200 K is compressed reversibly and adiabatically untill final temperature reaches 250 K If molar heat capacity at constant volume is 27 cal mol K find work O 3050 cal O 3550 cal O 4050 cal O 4550 cal Marks 4 1

Which of the following is a buffer solution O 500 ml of 0 1 N CH3COOH 500 mL of 0 1 N NaOH O 500 ml of 0 1 N CH3COOH 500 mL of 0 1 N HC1 O 500 ml of 0 1 N CH3COOH 500 mL of 0 2 N NaOH O 500 ml of 0 2 N CH3COOH 500 mL of 0 1 N NaOH

3 Water hyacinth 4 Hydrilla 89 3 Mammary alveoli 4 Glandular cells Which of the following in not associated with the secretion of milk in mammary glands 1 Mammary duct 2 Mammary lobes 90 1 Maturation of sperm 2 Energy utilization for movement 3 Sperm motility 4 Penetration into the ovum 91 1 pyro electricity 2 piezo electricity 3 ferro electricity 4 ferri electricity melding 95 Absence of acrosome will affect which activity in a normal sperm The density of KCl is 1 9893 g cm3 an side unit cell is 6 29082 A as deter diffraction The value of Avogadro s m from these data is 1 6 017 x 1023 2 6 023 x 1023 3 6 03 x 1023 4 6 017 x 1019 The phenomenon in which polar crystals on heating produce electricity is called 92 Test Contact Number 9667591930 1 0 668 gcm 3 2 0 585 gcm Lithium borohydride LiBH4 crystallises in an orthorhombic system with 4 molecules per unit cell The unit cell dimensions are a 6 81 A b 4 43 A c 7 17 A If the molar mass of LIBH4 is 21 76 g mol The density of the crystal is 3 1 23 gcm 3 4 None of these 93 The mass of a unit cell of CsCl corresponds to 1 8Cs and Cr 2 1Cs and 6CI 3 1Cs and 1CI 4 4Cs and Cl 94 Which arrangement of electrons ferromagnetism 1 1111 2 1111 3 Both 1 and 2 4 None of these 96 pH of a 0 1 M mono basic is founc osmotic pressure at given temperature T 1 0 1 RT 2 0 11RT 3 1 1RT 4 0 01RT 97 If an iron rod is dipped in CuSO solutio 1 blue colour of the solution turns red 2 brown layer is deposited on iron rod 3 no change occurs in the colour of the 4 none of the above 98 Passage of three faraday of charge solution of AgNO3 CuSO4 Al NO3 deposit moles of metals at the cathode of

A solid compound ACI is used for the preparation of A Molten ACI is electrolysed and 177 5 g of Cl is produced The amount of A in g produced at cathode is Y Atomic mass of A is 30 amu and efficiency of process is 100 Find the value of 6x assume A reduces only to A s and Y 30 g

Assuming complete ionization same m which of the following compounds will require the least amount of acidified KMnO4 for complete oxidation Re AIPMT 2015 1 FeC 04 3 FeSO4 2 Fe NO 2 4 FeSO3 invo

C Molecular formula of starch can be represented as C6H1005 n If the gold number of one such starch molecule is 12 96 and 0 01 millimoles of the above starch are required to be added to 10ml of gold sol to prevent coagulation by 1ml of 10 sodium chloride solution then calculate the value of n

MX mole x2 7 xlo 2 1x10 mx 965 00 5 0800 C of electricity on passing through the electrolyte solution deposited 2 977 of metal with atomic mass 106 4g mol the charge on the metal cation is a 4 c 2 b 3 d 1 ploctrolysis of H O the molar ratio of H and O2

d zero c 3 0 A 3 p orbital has a two non spherical nodes b two spherical nodes e one spherical and one non spherical node d one spherical and two non spherical nodes 1 of the following set of quantum X l 1

Two electrolytic cells connected in series containing dil H SO4 and dil HCI are electrolysed using platinum electrodes The ratio of volume of gases evolved at the respective anodes is 1 1 1 3 2 3 2 1 2 4 3 4

One 591 mL bottle of Gatorade a popular sports drink contains 35 g of sugar If the sugar compound is glucose C6H12O6 what is the molar concentration of glucose in Gatorad Choose the closest answer Note 1 M 1 mol L O 0 11 M 03 4 M O 11 0 M 01 2M 0033 M

Q1 Tick Mark the correct answer 1 In atomic absorption the sample is and excited by heat energy generated by a vaporised flame c quantised lamp b atomised burner d ionized furnace Atomic absorption is primarily used for the determination of in a sample

158 0 32 The equivalent weight of FeS in the following reaction is FeS 0 Fe SO 1 3 Mol wt 1 Mol wt 11 2 4 Mol wt 7 Mol wt 9 3 6 5 4 5 5 2 Find the inco 1 Higher r stronger 2 Lower c strong o

c quantised lamp Atomic absorption is primarily used for the determination of in a sample a trace metals b non metals d minor constituents atoms in the vapour state 1 c major constituents In A AS radiation is absorbed by

of Particles and Rotational Motion 6 The angular speed of the wheel of a vehicle is increased from 360 rpm to 1200 rpm in 14 second Its angular acceleration is a 28 rad s c 1 rad s b 120 rad s d 2 rad s

The mass of a unit cell of CsCl corresponds to 1 8Cs and Cl 2 1Cs and 6CF neet prep 1 1 2 3 1 2 6 3 2 6 3 6 3 0 0 98 Passage of three faraday of charge through aqueous solution of AgNO3 CuSO4 Al NO3 3 and NaCl will deposit moles of metals at the cathode in the molar ratio of High Yielding Test Series Part Test 5 Page Contact Number 9667591930 8527521718 1 Frankel Defect 2 Interstitial Defect 3 F Centres 4 Schottky Defect

a electrolytic b galvanic c voltaic 3 The resistance offered by a solution to the passage of current is called a back e m f b applied voltage c iR drop d polarisation When a non linear relationship is shown between potential and current the phenon d reversible

Which of the following is most powerful oxidizing agent 1 Cl 2e 2CI E 1 36V 2 Nat eNa E 2 71V 3 MnO 2H O 2e MnO 40H E 0 6V 4 H O 2H 2e 2H O E 1

4 23 C 114 The rate of reaction triples when temperature change from 20 C to 50 C Calculate energy of activation for the reaction 1 28 81 kJ mol 1 2 38 51 kJ mol 1 3 18 81 kJ mol 1 4 8 31 kl mol 1

c 0 125 M Na3PO4 aq has the highest osmotic pressure d 0 500 M C H5OH aq has the highest osmotic pressure 5 Por a dilute solution containing 2 5 g of a non volatile non electrolyte solute in 100 g of water the elevation in boiling point at 1 atm pressure is 2 C Assuming concentration of solute is much lower than the concentration of solvent the vapour pressure mm of Hg of the solution is take K 0 76 K kg mol 2012 a 724 V c 736 b 740 d 718

3 NO 4 HNO 1 Air 2 NH 10 The order of increasing reactively of the following compounds towards HCI will be 1 CH CH 11 2 CH C CH 3 CH CH CHCH 1 1 2 3 Ans 2 The mo 2 1 3 2 3 3 2 1 If th 4 2 1 3

Example 9 The procedure used to determine lead in mannitol was also used to determine nickel in a sample of mannitol Calculate the content of nickel in a sample of mannitol from the following data 100 5 g of mannitol was dissolved in 250 ml of water A standard solution containing nickel at 10 6 ppm 10 6 mg ml was used to prepare a calibration series by adding 0 5 ml 1 0 ml and 1 5 ml of the standard to 50 ml aliquots of the mannitol solution The following readings were obtained 0 378 0 543 0 718 0 891 Calculate the content of nickel in ppm in the sample of mannitol

Dibenzalacetone C 7H140 is a common ingredient in sunscreens that can be prepared by the following chemical reaction 2 C H O C H O C 7H 40 2 H O In a lab experiment 4 25 g of C H O and 1 10 g of C H5O were used to synthesize CH 40 The target product was produced as a yellow solid with a 78 4 yie What mass of C 7H 40 was isolated Choose the closest answer Relevant molecular masses C H5O 106 12 g mol 1 C H5O 58 08 g mol 1 C17H140 234 29 g mol 1 04 69 g O 7 28 g O 3 48 g Q2 22 P

Saturated ethylene glycol vapour at 1 atm is exposed to a vertical plate 300 mm high and 100 mm wide having a uniform temperature of 420K Estimate the heat transfer rate to the plate and the condensation rate Approximate the liquid properties as those corresponding to saturated conditions at 373K Answers q 2 21 kW condensation rate m 2 44 10 kg s

4 Square planar Diamagnetic 125 The hardest lanthanide is 1 La 2 Gd 3 Sm 4 Yb 126 Which of the following can not exist together in aqueous solution 1 HgCl and SnCl 2 HgCl and SnCl 3 SnCl4 and FeCl3 4 SnCl4 and PbCl 127 Which of the following is the correct order of increasing field strength of ligands to form coordination compounds 1 SCN F CN C 0 2 F SCN C 0 CN 3 CN C 0 SCN F 4 SCN F C 02 CN 128 Alum helps in purifying water by 1 forming Si complex with clay particles 2 sulphate part which combines with the dirt and removes it 3 aluminium which coagulates the mud particles 4 making mud water soluble 129 Among the following surfactant molecules the surfactant that forms micelles in aqueous solution at the lower CMC at ambient condition is 1 CH3 CH 15N CH3 3Br 2 CH CH OSO Nat 3 CH3 CH COO Na 4 CH3 CH2 11N CH3 3Br 130 Which one of the compound does not decolourised an acidified solution of KMnO4 1 S0 2 FeCl3 3 H 0 4 FeSO4 131 Which ore contains both iron and copper 1 Cuprite 2 Chalcocite 3 Chalcopyrite 4 Malachite 132 Which one of the following compounds on hydrolysis yield hydrogen peroxide 1 HNO3 2 H P 0 3 H S 08 4 H S 06 133 The formula of exhausted permutit is 1 K Al Si 0 XH O 2 CaAl2Si O8 xH O 3 Na Al Si 0 xH O 4 CaB Si 0g xH O 134 For a tetrahedral complex MCI the spin only magnetic moment is 3 83 B M The element M is 1 Co 2 Cu

178 A 25 0 mL sample of 0 10 M HCl is titrated with 0 10 M 178 0 10 M HC500 M Na 4 55 x 10 3 NaOH What is the pH of the solution at the points where Fall 24 9 25 1 mL NaOH for all 24 9 and 25 1 mL of NaOH have beeen added 1 3 70 10 70 2 3 30 10 30 3 3 70 10 30 4 3 0 11 0 179 Which of the following is a buffer solution 1 500 mL of 0 1 N CH3 COOH 500 mL of 0 1 N NaOH 1 3 70 10 70 2 3 30 10 30 33 70 10 30 4 3 0 11 0 179 a facer 1 500 mL of 0 1 N CH3 COOH 500 mL of 0 1 N NaOH

When SO is passed in acidified potassium dichromate solution the oxidation number of S is changed from 1 4 to zero 3 4 to 6 2 4 to 2 6 to 4 WA

Which of the following combination can form an acid buffer A 100 ml of 0 1 M CH3COOH 100 ml of 0 1 M NaOH B 100 ml of 0 2 M NH4OH 100 ml of 0 3 M HCI C 100 ml of 0 2 M CH3COOH 100 ml 0 1 M NaOH D 50 ml of 0 1 M CH3COOH 50 ml of NOLL

The reaction A Product follows first order kinetic and the progress of reaction is depicted in the figure In A 2 3 4 10 4 2 10 Time sec Half life of this reaction is approximately A 10 s B 100 s C 500 s D 1000 s

The half life for the first order reaction is 69 s What time it will require to complete 80 of the reaction log 5 0 6990 Question Type Single Correct Type 1 2 3 160 S 69 s 124 S

The Vrms of a missed particle having a mass of 10 12g at 27 C if value of Boltzmann constant k is 1 31 x 10 16 m sec Find the value of 2x Consider the nearest integer ergs per degree per molecule is x

The voltage of a cell whose half cells are given below is Mg 2e Mg s E 2 37V Cu 2e Cu s E 0 34V Standard EMF of the cell is OU O 1 261 210 7V AY 031

2 In what ratio should a 15 solution of acetic acid be mixed with a 3 solution of the acid to prepare a 10 solution all percentages are mass mass percentages A 7 3 B 5 7 e 7 5 D 7 10 3 X gram of pure As S is completely oxidised to respective highest oxidation states by 50 ml of 0 1 M hot

13 The rates of a certain reaction times are as follows Time 0 10 20 30 The reaction is 1 Zero order 3 Second order Rate mole litre sec 2 8 10 2 78 10 2 81 10 2 79 10 2 First order 4 Third order 19

4 Lower members have a pleasant smell and burning taste higher members are colourless and tasteless Which of the following complexes are not correctly matched with hybridisation of their central metal ion 1 Ni CO sp 2 Ni CO sp 3 CoF d sp 4 Fe CN sp d Select the correct answer using the codes given below 1 1 and 2 2 2 and 4 3 1 3 and 4 4 2 3 and 4

Delta Go for the formation of phosgene according to the equation below is 53 9 kJ mol CO g Cl2 g COCI2 g Calculate the value of Kc A 2 8 X 109 B 2 2 X 10 10 C 1 8 X 1022 D 5 6 X 10 23 E 1 02

0 98 g H3PO4 is dissolved in 100 mL of a buffer solution pH 5 If the equilibrium concentrations H PO HPO PO and H3PO4 are C C C3 and C4 respectively Find pC pC PC3 po pC log C where i 1 2 3 4 Given For H3PO4 K 10 K 108 K 10

In an X ray experiment different metals are used as the target In each case the frequency v of the radiation produced is measured If Z atomic number which of the following plots will be a straight line A v against Z B 1 v against Z C against Z J y against

Which of the following is amphoteric 1 CO 2 PbO 3 SiO 4 SeO 2 124 Litharge is not commonly used in 1 manufacture of special glasses 2 glazzing pottery 3 preparing paints 4 lead storage battery 125 The increasing order of the reactivity of the following compounds towards electrophilic aromatic substitution reaction is COCH CH 1 II 1 III I II 2 III II 1 3 II I III 4 I III I 127 126 The liquefied gas that is used in dry cleaning along with a suitable detergent is 1 Water gas 2 Petroleum gas 3 NO 4 CO III and Which of the following pairs of structures does not represent isomers and 0 40 0 and 3 128 1 79 2 118 5 mandelic acid has a specific rotation of 158 What would be the observed specific rotation of a mixture containing 25 mandelic acid and 75 mandelic acid 3 79 4 118 5 391950 1 16 2 8 3 4 4 2 129 The total number of optically active isomers for CH OH CHOH CHO are and 130 The compound with an isopropyl group is 1 2 2 3 3 tetramethylpentane 2 2 2 dimethylpentane 3 2 2 3 trimethylpentane 4 2 methylpentane 131 1 1 2 2 3 4 3 1 2 3 4 1 3 Which of the following compounds will show geometrical isomerism 1 2 butene 2 Propene 3 1 phenylpropene 4 2 methylbut 2 ene 132

In the reaction 6CH 3H g aq aq 2AL 6HCl 2A1 1 6L HC1 is consumed for every 3L H produced aq 2 33 6 L H is produced regardless temperature and pressure for every moles that reacts 3 67 2 L Hat STP is produced for every mole of Al that reacts 1 2 LH at STP is produced for every mole of HCI consumed COM ulphuric acid solution that is 29 H SO molar mass 98 g ma

Suppose a 250 mL flask is filled with 2 0 mol of CH4 1 6 mol of CO and 0 30 mol of H This reaction becomes possible CH g H O g CO g 3H g Complete the table below so that it lists the initial molarity of each compound the change in molarity of each compound due to the reaction and the equilibrium molarity of each compound after the reaction has come to equilibrium Use x to stand for the unknown change in the molarity of CH4 You can leave out the M symbol for molarity initial change CH 0 X H O 0 CO O U H 0 Olo X S

An AB solid has CsCl type of structure where A occupies corner If the atoms from corners along one of the body diagonal are removed the formula of a the solid would be 1 A B 2 A B6 3 A B D

79 Which of the following is a buffer solution 1 500 mL of 0 1 N CH3 COOH 500 mL of 0 1 N NaOH 2 500 mL of 0 1 N CH3 COOH 500 mL of 0 1 N HCI 3 500 mL of 0 1 N CH3 COOH 500 mL of 0 2 N NaOH 4 500 mL of 0 2 N CH3 COOH 500 mL of 0 1 N NaOH

The normal boiling point of a liquid X is 500 K Which of the following statement s is are incorrect for the following process X liquid X gas At 500 K and 1 atm pressure AG 0 At 500 K and 1 5 atm pressure AG ve At 500 K and 0 2 atm pressure AG ve At 520 K and 1 atm pressure AG ve

3 increase the concentration of NO3 ions 4 decomposes Na S and NaCN if formed 110 In the following the most stable conformation of n butane is 1 2 H H H H CH3 H CH3 CH3 CH3 H H CH3 CH3 ICH3 H H3C H H

11 1 CHEMISTRY AIPMT 2008 ONCEP Volume occupied by one molecule of water density 1 g cm is 1 9 0 x 10 23 cm 2 6 023 x 10 23 cm 3 3 0 x 10 23 cm What is the OH l in the final solution prepared by mixing 200 ml of 0 050 M HClith 4 5 5 x 10 23 cm

32 B Deduce from the following E values of half cells what combination of two half cells would result in a cell with the largest potential i A eA ii B e iii C 2e iv D 2e E 0 68 V a ii and iii b ii and iv d i and iv c i and iii For the cell prepared from electrode A and B EL 11 33 V and Elect C 133 D E 0 24V 96602 E 1 25 V E 1 25 V 379

class XIII Spartan Batch Chemical Equilibrium lonic Equilibrium 176 The solubility of AgBrO formula weight 236 is 0 0072 176 AgBrO HR 236 factu 0 0072 1000 mL g in 1000 mL What is the k sp 1 2 2 x 10 8 2 3 0 10 10 3 3 0 10 5 4 9 3 x 10 10 akam sp 1 2 2 x 10 8 2 3 0 10 10 3 3 0 x 10 5 4 9 3 10 10

31 To 500 cm of water 3 0x 103 kg of acetic acid is added If 23 of acetic acid is dissociated what will be the depression in freezing point K and density of water are 1 86 K kg mol and 0 997 g cm and 0 997 g cm respectively

below Choose the correct statements NH3 NH3 NH3 AAJ KA TOPPER I II 1 Anilinium ion has two stable canonical structures I and III 2 II is not an acceptable structure because carbonium ion is less stable 3 Only I and III are acceptable aromatic canonical structures since II is non aromatic

4 2 3 104 104 At the intersection point of two curves nA mB the concentration of B can be given by assume I order A Conc m 1 3 A o m n m A o Time B m 2 A n 4 A n A m n n the fig