General Questions and Answers

c photovoltaic cells The intensity of spectral lines in different parts of the flame a varies b remains same d remain unchanged c changes In flame most of the lines emitted are from the AUNVR

96 Two possible stereo structures of CH3CHOH COOH which are optically active are called 1 Diastereomers 2 3 4 Mesomers Atropisomers Enantiomers 97 4 100 Conside find ou linear 1 CH 2 CH

Which one of the following pairs is iso structural i e having the same shape and hybridization 1 BCI and BrCl3 2 NH3 and NO3 3 NF3 and BF3 4 BF4 and NH 117 1 2 3 4 121 T ec 1 2

nitrogen in the soil is 1 37 33 neet prep High Yielding Test Series Part Test 4 1 help in the precipitation of AgCl 2 increases the solubility product of AgCl The Lassaigne s extract is boiled with conc HNO while testing for halogens Because 3 increase the concentration of NO ions IM CONCE Contact Number 9667591930 8527521718 CH3 H H H Page H

Ib The R and S enantiomers of an optically active sh compound differ in 1 their optical rotation of plane polarized light 2 their reactivity with chiral reagents 3 their solubility in achiral reagents 4 their melting points 108 C

a narrowing b broadening 7 In AAS is obeyed over a wide range of a Lambert s law b Nernst law B For alkali metals laboratory type lamps c resonance d sputtering concentrations c Beer s law d Bouguer s law can be used as a source instead of hollow

Select the incorrect option when a lead storage battery is discharged A B SO is evolved Lead sulphate is produced at both electrodes Sulphuric acid is consumed Water is formed

A generic solid X has a molar mass of 55 9 g mol In a constant pressure calorimeter 26 4 g of X is dissolved in 369 g of water at 23 00 C X s X m The temperature of the resulting solution rises to 26 40 C Assume the solution has the same specific heat as water 4 184 J g C and that there is negligible heat loss to the surroundings How much heat was absorbed by the solution What is the enthalpy of the reaction kl

Solvelancer Test For the given organic compound select the correct IUPAC name s from the following CH CH CH CH CH CH CH CH CH CH CH CH T CH Solvelancer Test a 5 2 Methyl propyl nonane b 4 butyl 2 methyloctane c 5 Isobutyl nonane a Only a b Only b c Both a c d Both b c

116 Identify the reagent from the following list which can easily distinguish between 1 butyne and 2 butyne 1 bromine CCl4 2 H Lindlar catalyst 3 dilute H SO4 HgSO4 4 ammonical cuprous chloride 117 121 1 1 2 3 4 122

c Graham s law 8 In controlled cathode potential electrolysis the third electrode used is a working electrode c counter electrode b reference electrode d auxillary electrode

Consider the reaction 2 S s 3 02 g 2 SO3 g Initially 1 0 moles of each reactant was placed into a 2 0 L flask At equilibrium 0 10 moles of SO3 g had formed What is the value of Kc for the reaction at this temperature Hints check the states of the substances in the reaction carefully and remember to think about which units you need to work in

If bond dissociation energy of H Cl and HC1 is 10 20 and 60 kcal mol respectively then what is the enthalpy of formation of HCI kcal mol 0 45 O 45 0 90 O 90 kcal mol kcal mol kcal mol

t Considering the state of hybridization of carbon atoms find out the molecules among the following which is linear 1 CH3 C C CH3 2 CH CH CH C CH 3 CH3 CH CH CH3 4 CH CH CH CH

2 Flame photometers use as detectors a phototubes c photovoltaic cells e The intensity of spectral lines b photomultiplier tubes d photoconductors in different parts of the flame 5 come

The zone refining of metal is based on the principle of Question Type Single Correct Type 1 Greater mobility of pure metal than that of impurity 2 Higher melting point of the impurity than that of the pure metal 3 Greater noble character of the solid metal than that of the impurity 4 Greater solubility of the impurity in the molten state than in the solid

3 Calculate the standard enthalpy of formation of naphthalene C10H8 when the standard enthalpy of combustion of naphthalene is 5153 kJ and the standard enthalpies of formation of CO2 and H2O are 393 5 kJ mol 1 and 285 8 kJ mol 1 respectively

A certain liquid has a vapor pressure of 92 0 Torr at 23 0 C and 338 0 Torr at 45 0 C Calculate the value of AHp for this liquid AH 72 Incorrect Calculate the normal boiling point of this liquid boiling point Incorrect A 0 513 g sample of steam at 107 5 C is condensed into a container with 5 01 g of water at 15 2 C What is the final temperature of the water mixture if no heat is lost The specific heat of water is 4 18 the specific heat of steam is 2 01 C and AHp 40 7 kJ mol kJ mc C

SolveLancer Test With reference to aqua regia choose the correct option s A Hg Cl is soluble in aqua regia B Aqua regia is prepared by mixing conc HCl and conc HNO3 in 1 3 v v ratio C Reaction of gold with aqua regia produces an anion having Au in 3 oxidation state D Aqua regia employed for etching of glass SolveLancer Test a Only A b Both B C c Both A D d A C D

4 Zero 113 A catalyst lowers the activation energy of a reaction from 20 kJ mole to 10 kJ mole The temperature at which the uncatalysed reaction will have the same rate as that of the catalysed at 27 C is 1 123 C 2 327 C 3 327 C 4 23 C

17 The freezing point in C of solution containing 0 1 g of K3 Fe CN 6 mol wt 329 in 100 g of water K 1 86K kg mol is 2 3 10 c 5 7x 10 3 Jas b 5 7 x 10 2 d 1 2x 10 2011

Glycine C H5NO is an important amino acid found in high protein foods How many carbon atoms are there in 1 50 g of pure glycine Choose the closest answer O1 20 1022 atoms 03 01x1025 atoms O1 87X1023 atoms 06 78x10 5 atoms 241x10 atoms

Given i Cu 2e value ii Cu e 100 Electrode potential E for the reaction Cue Cu will be 1 0 52 V 2 0 90 V 3 0 30 V 0 201 Cu E 0 337 V Cu E 0 153 V

SolveLancer Test What is are characteristic of ozone O 1 The O O distances are not equivalent 2 It is a non linear triatomic system 3 It is made by passing an electrical discharge through oxygen 4 It is an extremely powerful oxidizing agent SolveLancer Test a 1 3 4 b 2 3 4 c 1 3

10 The dissolved oxygen in test solution shows interferring nuisance in polarographic analysis due to reaction of a oxidation of mercury c Oxidation of cations b conversion of O H O H O d H O O H O 02

SolveLancer Test In a given reaction A BC the percentage of B from A is 20 and percentage of C from B is 40 What is the overall percentage of C from A SolveLancer Test a 40 b 20 c 60 d 8

The mass of a piece of metal is 19 5061 grams When the piece of metal was dropped into a graduated cylinder that had an initial water volume of 8 75 cm the total volume was 9 76 cm What is the density of the piece of metal in g cm

A fused mixture of rubidium fluoride and uranium IV fluoride can be oxidized with fluorine t produce a uranium compound in which the uranium is mainly but not entirely in the oxidation states The product is found to contact 54 93 uranium A 1 0357 gm sample of t product immersed in 100 ml of 10 07 centimolar acidified potassium iodide solution reacti accordingly as following equation 21 2UF6 2UF4 1 4F The iodine produced was titrated with 14 80 ml of 14 94 centimolar sodium thiosulphate soluti What of the original mixture oxidized to 5 oxidation state

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

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

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

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

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

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 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

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

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

35 What is the end product in the following sequence of reactions COOH PCI 2NH Q Br KOH 1 Aniline 2 Phenol 3 Benzene 4 Benzenediazonium chloride R

9 0 The correct order of acidity for the following compounds is CO H CO H HO I OH 1 I II III IV 2 III I II IV In the following sequence of reactions The compound O formed will be II OH CO H III 3 III IV II I OH CO H OH IV 4 I III IV II

The product s obtained via oxymercuration HgSO4 137 H SO4 of but 1 yne would give 11 1 CH3CH C CH3 2 CH CH CH CHO 3 CH CH CHO HCHO 4 CH CH COOH HCOOH 135 A hor sm stic OSC W

80 0 1 M formic acid solution is titrated against 0 1 M NaOH solution What would be the difference in pH between 1 5 and 4 5 stages of neutralization of acid 1 2 log 3 4 2 2 log 1 5 3 log 1 3 4 2 log 4

3 0 2 g of an organic compound contains C H and O On combustion it yields 0 15 CO and 0 12 g H O The percentage of C H and O respectively is 1 C 15 H 20 O 65 2 C 10 H 8 2 O 81 8 3 C 12 2 H 8 8 O 79 4 C 20 H 6 66 O 73 34

4 Anilinium ion has three stable canonical structures I II and III 90 Which of the following compounds will have highest melting point CH3 CH3 CH3 CH3 I 2 11 CH3 3 111 CI CH3 II 4 All have equal melting point Page 16 54

0 Multiple Choice Select 1 out of 4 options for the question below 45 A Pulled wool is obtained from 50 55 Options Lamb Dead sheep Camel Adult sheep Clear Response