General Questions and Answers

c just greater than 6 d just less than 7 24 10 5 M NaOH solution at 25 C is diluted 1000 times The pH of the resultant solution w blie between 7 and 8 d remain unchanged a be equal to 8 c lie between 6 and 7

a none of 142 How many electrons with 1 3 are there in an atom having atomic number 54 a 3 b 10 c 14 d None of these 143 The electronic configuration of an element is 1s 2s

246 The quantum number for the last electrons of an atom are n 2 1 0 m 0 s 1 2 The atom is Ca lithium b boron d hydrogen c carbon 17 7 The mannetic moment of electron in an atom excluding

200 gms of marble chips are dropped into one kilogram of solution of HCI conta tenth of its weight of the pure acid How much of chips will remain undissolved What anhydrous calcium chloride and what weight of CO2 gas could be obtained from it

An organic compound A CxH O was treated with 12 NaOH consumes 6 moles of 1 to produce iodoform and a dibasic acid B which when treated with alkaline KMnO4 pink color of KMnO4 gets decolorized with no organic compound left as residue The minimum value of X is

33 Mrs Usha a science teacher performed the following experiments Experiment 1 She heated sugar in a China dish A black substance was obtained along with caramel fumes Experiment 2 She mixed sand and crushed naphthalene balls in a China dish Then she covered the China dish with a watch glass with some ice kept on it and heated Crystals of pure naphthalene were seen on the underside of the watch glass A B Identify the changes taking place in these experiments Experiment 1 Chemical change Crystallisation Experiment 2 Physical change Decomposition Experiment 1 Physical change Crystallisation Experiment 2 Chemical change Sublimation Experiment 1 Physical change Crystallisation Experiment 2 Physical change Crystallisation Experiment 1 Chemical change Decomposition C D Experiment 2 Physical change Sublimation and

215 H has two natural isotopes of H and H and 0 has C v two isotopes 0 6 and O18 Which of the following mol mass of H O will not be possible a 19 24 b 20 d 22 o wave equation of an elect

CAREER INSTITUTE 59 The V C distance in V CO and V CO 6 are respectively 59 V CO V CO V pound anmics in pm 1 200 200 2 193 200 3 200 193 4 193 193 conci C W Isomerism IUP 1 200 200 2 193 200 3 200 193 4 193 193 V C B

30 What change will occur for the following reaction if the hypochlorous acid solution is diluted from 0 1 to 0 01 M HOCl aq H O 0 OCl aq H O aq a a decrease in the fraction of acid ionized b an increase in the fraction of acid ionized c no change in the fraction of acid ionized d we can not predict Given 1

A hydrocarbon contain 80 C The vapour density of compound is 30 Empirical for compound is 1 CH 2 C H 4 CH Two elements X Atomic weight 75 and Y Atomic weight 16 combine to give a compound having 75 89 of X The empirical formula of compound is 1 XY 2 X Y 3 X Y XY

The curve in the figure shows the variation of pH during the course of titration of a weak acid HA with a strong base NaOH At which point in the titration curve is the concentration of the acid may be equal to that of its conjugate base pH A B a Point D c Point C D C E ml of NaOH added b Point E d Point B

7 Different hydrogen in the compound are 77 faf gten vergel at diferente a represented by alphabets CH CH CH CH CH CH CH D E F A B C arrange them in decreasing order of reactivity towards free radical substitution 1 C A E D F B 2 F B A C D E 3 B C A F D E 4 A B C D E F CH CH CH CH CH CH CH B C D E F segur pasi fisuriteam A 1 C A E D F B 2 F B A C D E 3 B C A F D E 4 A B C D E F

4 2 1 80 g of a certain metal burnt in oxygen gave 3 0 g of its oxide 1 50 g of the same in steam gave 2 50 g of its oxide Show that these results illustrate the law of constant proportion 1 In the first sample of the oxide

4 B Be N 0 C A B Cation Anion XeF SbF Incorrect statement for above changes is 1 XeF act as F donor 2 Hybridisation state of central atom in cationic part is sp d 3 Anionic part is isostructural with PCI 4 Both cation Anion have identical shape 4 B Be N 8 C A Cation 47 XeF SbF B Anion Buda ufada fast 1 XeF Fal si are si sa 2 3 ten sp d C 4 A fa t

31 The nucleus of an atom of X is supposed to be a sphere with a radius of 5x 10 cm Find the density of the matter in the atomic nucleus if the atomic weight of X is 19 Hint Density mass of 1 mole i e at wt vol of 1 mole 6 02 x 10 g mL

Ar Haut is AA fatfed fand A It is possible to differentiate the two isomers of the 1 3 A complex Co NO 3 NH3 3 by comparing their dipole moment values R The complex Co NO 3 NH3 3 shows facial and meridional isomerism Only cis PHNH Q R High Co NO NH3 3 facial en meridional R

gura 10 r 11 1g H gas STP is expanded so that Hence work done is 1 22 4 L atm 2 5 6 L atm 3 11 2 L atm 4 44 8 L atm Given msat SNULL 3 X2 LIO 300R 303 101 6 X101 606 x 1 yoxxy 83 22 kcal A B es una aldi faal PV 1x Ray 22 9 1 22 4 L atm 2 5 6 L atm 3 11 2 L atm 4 44 8 L atm 55 f r 49 2214 PAV 2N V 1 2 1 atm astea N g 3H g 2NH g AH 22 kcal

75 00 8 Taxable Amount NCode 6307 Total Gross Discount SplDiscount SchemeDisc B4 Taxaros Total CAST op Net Amt 4 17 4 17 175 00 00 66 67 8 34 SLIE CGST SGST TotalTax Amount 4 17 4 17 1 75 00 00 00 00 8 34 8 34

When a quantity of electricity equal to that required to liberate 2 24 L of hydrogen at STP from 0 1 M aqueous H SO4 is passed then the mass of copper that will be deposited at cathode in electrolysis of 0 2 M solution of copper sulphate will be At mass of Cu 63 5 Question Type Single Correct Type 1 2 3 1 59 g 3 18 g 6 35 g

158 A Both cis 1 3 dimethyl cyclobutane and trans 1 3 dimethyl cyclobutane are optically inactive chy R cis 1 3 Dimethyl cyclobutane has the plane of symmetry whereas trans form has the centre of symmetry

23 4 milliliters of liquid nitrogen are allowed to turn boil into a gas at 298K If the density of liquid nitrogen is 0 808 g mL what is the volume of the nitrogen assuming that the pressure is 744 mmHg

69 Holme s signals can be obtained by using 2 CaC Ca P 4 Ca P CaCN 1 CaC CaCN 3 CaC CaCO Br 69 Holme s signal feh 4 2 CaC Ca P 4 Ca P CaCN aix re 1 CaC CaCN 3 CaC CaCO

3 Cr NH3 4 NO CO NH3 NO 4 4 Co NH3 5 NO Cr NH3 NO 5 51 Possible linkage isomers of the compound Co NH3 4 SCN NO 1 2 2 3 3 4 4 1 NO CO NH3 NO 5 2 Co NH3 6 Cr NO 6 X 3 Cr NH3 4 NO CO NH3 2 NO 4 4 Co NH 5 NO Cr NH3 NO 5 61 Co NH3 4 SCN NO affa OFF THE 1 2 S4 N 2 3 NCS 3 4 4 1 S CN NO 2

1 Eu 2 La 3 Gd When Mg burns in air it produces 1 MgO MgO 2 MgO Mg N MgO 4 Am 3 Mg N only 4 Mg N MgO A gas present in a cylinder expands against a 4 Am 80 Mga ta 1 MgO MgO 2 MgO Mg N MgO Mg N 3 4 Mg N MgO 81 3 Gd A 1 atm fra fire 2 efter

Consider a very weak acid HA having K 10 10 If concentration of HA taken is 1M then find the specific conductivity of the solution A H 350 Scm mol A A 100 Scm mol O O 4 5 x 106 S cm O 0 45 S cm O 3 5 x 10 S cm 0 35 S cm

t The total number of electrons that can be accommodated in all the orbitals having principal quantum number 2 and azimuthal quantum number 1 is b 4 2 2 M 4 4 d 8 RA 122 a 2 c 6

Photochemical dissociation of oxygen results in the production of two oxygen atoms one in the ground state and one in the excited state hv 0 0 0 The maximum wavelength needed for this is 174 nm If the excitation energy 00 is 3 15 x 10 19 J How much energy in kJ mole is needed for the dissociation of one mole of oxygen into normal atoms in ground state 1 498 3 kJ mol 1 2 418 3 kJ mol 1 3 524 1 kJ mol 1 4 612 8 kJ mol 1

229 A neutral atom of an element has 2K 8L 11M and 2N electrons Total number of electrons with 1 2 will be 23 a zero c 6 b 3 d 10 energetic transitions of

1 6 2 2 3 8 4 16 Which of following has maximum possibility to find electrons in d orbital 1 Along x axis 2 Along z axis 3 Along xz plane 2D 4 At an angle of 45 from z x axis 7 200

How many significant figures should be present in the answer of the following calculations 0 02856 x 298 15 0 112 i 0 5785 iii 0 0125 0 7864 0 0215 ii 5 x 5 364

59 Consider following cases I 2M CH3COOH solution in benzene at 27 C where there is dimer formation to the extent of 100 II 0 5 M KCl aq solution at 27 C which ionises 100 Which is are true statements s 1 both are isotonic 2 I is hypertonic 3 II is hypotonic 4 none is correct KELL han 12 3 12 18 16 15 12 16 16 1 0 5m nej 59 ffff di I 1 27 2 M CH COOH YET FEMICH 100 f II 27 C 0 5 M KC face 100 0 5X115 24 2315 1 R 2 13 3 IRR 4

0 1 m aqueous solution of K4 Fe CN 6 will have the same freezing point as 0 1 m aqueous solution of all except Assume 100 dissociation of electrolyte Al2 SO4 3 Ca3 PO4 2 Na2SO4 MgSO4 4 H O K3 Fe CN 6

3 0 05 mole B On heating 3 526 g of hydrated BaCl to dryness 3 010 g of anhydrous salt remained Hence the formula of the hydrate is Atomic weight a Ba 137 1 1 BaCl H O 0 ROCL2H O HO 2 BaCl H O 4 BaCl 5H O S

Packing fraction along body diagonal in Primitive cubic Simp 1 3 cubic is Packing fraction along edge in bcc is 3 2 1 Packing fraction along face dia gonal in fcc is 2

The ratio of mass percent of C compound C H O is 6 1 If one molecule of the above compound C H O contains half as much oxygen as required to burn one molecule of compound CxHy completely to CO and H O The empirical formula of compound C HyOz is Main 2018 a C H O CHO b C H O d C H O

A sample consisting of chocolate brown powder of PbO is allowed to react with excess of KI and iodine liberated is reacted with N H4 in another container The volume of gas liberated from this second container at STP was measured out to be 1 12 litre Find out volume of decimolar NaOH required to dissolve PbO completely Assume all reactions are 100 complete Give your answer divide by 100

5 pts A sample of P4010 was reacted with water the most likely product of this reaction H3PO3 b H PO4 c P OH 3 d H P4011 5 pts In a synthetic chemical reaction the theoretical yield refers to The EE

1 90 C 3 110 C 58 Glycerol KHSO t c 2 100 C 4 120 C LIATH 1 90 C 3 110 C B A and B 58 Glycerol 1 lei feel 2 fferafter whe uffer the 3 Ulice i 4 A are respectively 1 acrolein allyl alcohol 2 glyceryl sulphate acrylic acidi allyl alcohol acrolein 3 4 none t e KHSO 2 100 C 4 120 C A LAI B A E

of an idal gas A C vm 3R and 2 mole of an ideal 66 gas B are Cv m R taken in a container and expanded reversible and adiabatically from 1 litre to 4 litre starting from initial temperature of 320 K AE or AU for the process is P Toy PI 2 101 MRT 1 240 R 2 240 R 3 480 R 9 3R22 mole JR mute 4 408 43 K BCv m R 1 240 R 2 240 R 3 480 R A C v m 3R 1 mole 3 320K R2 mole for 4 HAR 14 E

Column I Compounds H H Me O HO Ron OH Me and H and Hl Me and M H NO and 0 Me NO OH Me Me Column II Isomers p Ring chain A Me q Metamer B r Position s Functional

adjacent positions only 155 A Trans CoCl en 2 is optically inactive R It has a plane of symmetry 156 A Pentane and 2 methyl pentane are horomologues 155 A Trans CoCl en chif fafcha i RE A TE L for 2 pfer 156 A 2

Negative Marks 1 If wrong option is selected 5 mole of A 6 mole of Z are mixed with sufficient amount of C to produce final product F Then find the maximum moles of F which can be produced Assuming that the product formed can also reused Reactions are A 2Z B B C Z F 05 O 10 O 15

76 If 3 01 x 1020 molecules are removed from 98 mg of H SO 76 af 98 fue H SO3 01 x 100 then the number of moles of H SO4 left are H SO 36 1 0 1 x 10 3 2 0 5 x 10 3 4 9 x 10 3 1 6 x 10 3 Which one of th I Class XIII Spartan Batch 6 sy PCBZ 2 C 8 4 1 0 1 x 103 3 1 6 x 10 3 20 5 x 10 3 4 9 x 10 6 00 3 01

56 If activation energy of a reaction is 800 cal mol at temperature 200 K The percentage of molecules having energy greater or equal to E is Given e2 7 38 a 1 2 7 3 25 2 4 13 5 1 35

151 A Complex Co en NO CI can exhible isomerism R Ethylene diamine en is bidentate ligand 152 A Fe CO complex is more stable than V CO R Fe CO obeys EAN rule but V CO does not N2 VO R Ethylene diamine en u fac fartus i 152 A Fe CO Highel V CO Highed at gaal f ch full R Fe CO Fight EAN 4 YIGH fch VCO 93 ATIMS PATTERN TEST 01 Date 30 10 2017 E 2 Lot

4 74 A 1 85 g sample of an arsenic containing pesticide was chemically converted to AsO 3 atomic mass of As 74 9 and titrated with Pb to form Pb ASO If 20 mL of 0 1 M Pb is required to reach the equivalence point the mass percentages of arsenic in the pesticide sample is closest to a 8 1 b 2 3 c 5 4 d 3 6

4 1380 g 4 1380 g 48 A compound is composed of 74 C 8 7 H and 17 3 N 48 74 C 8 7 H3 17 3 HR by mass If the molecular mass of the compound is 162 162 what is its molecular formula 1 C H N 10 14 2 C H 0 10 10 3 C H 4N 10 14 4 C H 4N 19 AU is equal to 2012 74 x 10 7 x 19 6 173 17 17 1 1 C 0H 4N 2 C H N 10 10 2 3 C H N 10 14 4 C H 4N 14 49 AU FRIOR

elect the net ionic equation for the reaction of hypochlorous acid HOCl aq with HaOH aq a H aq OCH aq Na aq OH aq H O 1 Na aq OCI aq b H aq OH aq H O 1 c HOCl aq Na aq OH aq OCT aq H O 1 Na aq HOCl aq OH aq OC aq H O 1 d

One mole triatomic vapours of an unknown substance effuses 4 3 times faster than 1 mol O under same conditions If the density of unknown vapours at pressure P and temperature T is d which of the following holds true for the unknown substance dN T P 0 8035 g Z atomic number 6 Z compress ibility factor 18P dRT Vapour density 9

What is the total number and mass of neutrons in 7 mg of 14C Assume that mass of a neutron 1 675 x 10 27 kg 1 2 41 1021 4 03 10 6 kg 2 6 23 1023 1 67 107 3 1 22 1022 4 03 106 kg 4 2 41 x 1021 4 03 10 6 g 21 kg