General Questions and Answers

4 Cs and I 61 An ionic bond A B is most likely to be formed when 1 the ionization energy of A is high and the electron affinity of B is low 2 Cs F 3 Na C 4 CI 61 A B a factor forg Asia dal fa 1 alfer 2 egin areal af B 2 the ionization energy of A is low and the electron affinity of B is high 3 the ionization energy of A and the electron affinity of B is high 4 the ionization energy of A and the electron affinity of B s low aximum lattice energy would he 3 A B din anal fuc f 4 OTfOr

Calculate the percentage composition of zinc phosphorus and oxygen in zinc phosphate Zn3 PO4 2 Zn 65 5 P 31 and O 16 u 36 0 90 g of an organic compound containing only carbon hydrogen and nitrogen on combustion gave 1 1 g CO and 0 3 g water What is C H and N in the organic compound 37 Calculate the number of atoms of oxygen present in 132 g CO What would be the weight CO having the same number of oxygen atom

4 Depends upon Ka of acid 76 In which of the following the solution of AgSCN will be unsaturated 1 Ag SCN K p 2 Ag x SCN K p 3 Ag x SCN K p 4 Ag SCN P K p 77 Which of the following pair of species have maximum difference of IP

omers of dimethyl 66 NaHCO decompose as 4 4 5 een given compound 2NaHCO s Na CO s CO g H O g The equilibrium pressure is 1 04 atm The K for reaction is 1 0 2704 atm 2 2 704 atm

b What is coagulating value The coagulating value of A and B will be 2 4 x 10 millimole per litre and 1 2 X 102 millimole per litre which one has higher coagulating power c What is Craft temperature T 2 2

4 h P 200x35x1024x4X344 200 35 10 27 3 P h 2 54 If the Planck s constant is 6 6x10 34 J s the de Broglie 54 fe ich fraich 6 6x10 34 J 4 h wavelength of a particle of mass 3 3x 10 27 Kg and veloc ity 200 ms will be 1 2 A 2 5 3 20 10 3 10 55 For any li 2 ms 2 1 2 2 5 3 20 4 10 0 FR43 3x 10 27 kg 200 3251 6 62X10 37 305810 27 X200 34 9

24 The density of solid argon is 2 3 amu 4 at 40K If the Argon atom is assumed to be dvolot 1A5 1 TPS 35 5 4 35 5 5nn by density al vol of unit cell for 3 A what percentage of sphere of radius 0 771 3 solid Argon is apparently without anything D 80 POCO SHOT ON 20 B 40 C 60 C 60

If bond dissociation energy of H Cl and HCI is 10 20 and 60 kcal mol respectively then what is the enthalpy of formation of HCI 45 kcal mol kcal mol Which elements are 3 90 2 45 4 90 kcal mol kcal mol oxidised and reduced

Calculate HY in a solution prepared by mixing 10 00 mL of 0 0100 M VOSO 9 90 mL of 0 0100 M EDTA and 10 0 mL of buffer with a pH of 4 00 A 4 6 10 0 M B 4 6 10 M C 6 4 10 M D 6 4x10 0 M

Calculate the quantity of pure lime and soda required for softening 100 000 litres of water containing the following impurities The purity of lime is 70 and soda is 85 Ca HCO3 2 30 2 mg mL Mg HCO3 2 20 8 mg mL CaCl2 28 1 mg mL MgCl2 mg mL CaSO4 35 mg mL MgSO4 6 7 mg mL 8 78 I

4 P Q and R 79 Degree of unsaturation of 1 7 2 8 3 6 44 5 is 79 1 7 2 8 3 6 4 5 IUPAC CH3CH N

The solubility of silver chloride can be increased by dissolving it in a solution containing ammonia AgCl s Ag aq Cl aq K 1 6 x 10 10 Ag aq 2NH3 aq Ag NH3 2 aq K 1 5 x 107 What is the value of the equilibrium constant for the overall reaction AgCl s 2NH3 aq Ag NH3 2 aq CF aq Knet A 1 5 x 10 B 2 4 x 103 C 3 1 x 103 D 2 3 x 10 4 E 2 4 x 10 COA OB OD OC OE

When titrating a strong base with a strong acid the pH before the equivalence point Question c options is neutral is acidic because enough acid has been added to neutralize the base leaving excess acid in the solution is basic because not enough acid has been added to neutralize the base leaving excess base in the solution is acidic because the strong base is converted to its conjugate acid

graph for question nos 7 8 On a closed rigid vessel combustion of 2 moles of CH was carried out with 10 moles of O At room temperature After combustion was complete what will be the vapour density of contents of vessel A 35 B 70 C 17 5 D 15 8

36 A ball of mass 0 2 kg is is thrown vertically upward by applying a force by hand The hand moves 0 2 m while applying the force and the ball goes up to 2 m height up What is the force if the value of G 10 m s A 22N B 16 N C 4 N D 20 N

88 The degree of unsaturation of molecular formula CH NOBIC 88 CH NOBRC 3 4 6 is 1 1 2 2 3 3 4 4 16 5 42 2 16 12 2 5 2 1 2 15 2 2 1 1 2 2 3 3 4 4

Example 13 87 cm of moist nitrogen is measured at 9 C and 659 mm Hg pressure Find the volume of dry nitrogen at S T P The vapour pressure of water at 9 C is 9 mm Hg Solution Pressure due to dry nitrogen alone 659 9 650 mm Hg P 650 mm V 87 cm T 273 9 K P 760 mm V cm T 273 K By the gas equation P V P2 V 2

a c 20 F 37 If Efe Fe X V E a C 2x x 4 2x x 2 d None of these Fe Fe2 X2 V what is the E 2x x 3 d 2x x b

4 4 2 89 The number of structural isomers possible with molecular 89 CH FRAICHE THIRDIRI CU 8 2 6 C X formula C H is X17 2 8 3 9 4 10 8 2 6 2 C C CEC C C G C 2 coge C C C actc 3 3 4 4 16 1 7 2 8 3 9 4 10 CEC C C 2 C C C 3 2X4 2 6 2 C CFC C fr C C C C

49 Find the ratio of the masses if a light string passing over a smooth light pulley connects two blocks of masses m1 and m2 vertically Given that acceleration of the system is g 8 A 9 7 B 1 8 C 7 4 D 3 5

4 6 023 x 1019 54 Calculate the partial pressure of CO from the following 54 rafetera T HET CO 112 T3 4 6 023 1019 simultaneous equilibirium CaCO s CO g C 2CO g Kp 2 1 0 2 2 0 4 CaO s CO g Kp 8 102 3 1 6 4 4 Oml of conc H SQ 18 molar fanfarg CaCO s CaO s CO g Kp 8 102 CO g C 2CO g Kp 2 1 0 2 270 4 3 1 6 2 4 8 X10 2 16 X16

Which of the following factors decide whether reaction will be elimination versus substitution A A Bulkier nucleophile will prefer to act as a base and abstracts a proton rather than approach a tetravalent carbon atom B High temperatures generally are favourable for elimination reaction C A tertiary halide goes for SN 1 or elimination depending on stability of carbocation or the more substituted alkene formed as product D A secondary halide decides SN2 or E based on relative strength as a base Nucleophile of the reagent

4 10 18 48 A precipitate of CaF2 Ksp 1 7x10 10 will be obtained 48 when equal volume of the following are mixed 1 10 4M Ca and 10 4 MF 2 10 2M Ca and 10 3 MF 10 5M Ca and 10 3 MF 264 10 M Ca2 and 10 5 MF 1XFX018 3 10 10 4 10 18 10 X 4 X 10 49 pk values of two acids A and B are 4 and 5 The strength 4x158 fuc un Buda F 1 10 M Ca en 10 4MFX 210 2M Ca 7 10 3MF 3 10 5M Ca 2 4 10 M Ca 10 MF 105 MF OF 10 78 Ca K 1 7x10 1 0 sp 108 10 4 x 4x10 8

The next problem involves directions in the form of bearing which we defined in this section Remember bearing is always measured from a north south line Round all answers to the nearest integer A boat leaves the harbor entrance and travels 26 miles in the direction N42 E The captain then turns the boat 90 and travels another 23 miles in the direction S48 E At that time how far is the boat from the harbor entrance and what is the bearing of the boat from the harbor entrance Distance from the harbor Roaring from the harbor S miles o W

The flocculation value of HCI for Arsenic sulphide sol is 30 m mol 1 If H SO4 is used for the flocculation of Arsenic sulphide the amount is gramsH2 SO4 of in 250ml required for above purposes is 0 72 0 18 1 44 0 37

Read the following statements A IP of O g is less than I P of O B I P of Ne g is greater than E A of Net C E A of O g is greater than E A of O D LP of N g is greater than I P of N The correct statements are Select one a A B C D b C D c B C D d A B D bij 19

10 Silver nitrate solution is gradually added to an aqueou solution containing 0 01 M each of chloride bromide and iodide ions The correct sequence in which the halides wi be precipitated is 1 Bromide chloride iodide 2 Iodide chloride bromide 3 Iodide bromide chloride 4 Bromide chloride

X 3X10 A Joom G 1 only a b c 2 only b c d 3 only a b d 4 a b c and d 50 What is the energy of photon which wave number is 10 cm 1 60 10 cm 1 8 x 10 24 J 662xX10 34 2 6 x 10 23 J 3 4 x 10 20 J 4 2 x 10 22 6 62 10 37 1926 F 6 62X 1 2 3 x10 cm a b c b c d a b d 4 a b c d 1 8 x 10 24 J 2 6 10 23 J 3 4 x 10 20 J 4 2 x 10

Certain quantity of electricity deposits 3 6 g of Al AW 27 from molten AlCl Then the weight of Ag AW 108 deposited by passing same quantity of electricit through aqueous AgNO3 solution is 1 43 2 2 32 4 3 14 4 4 28 8

8 A gaseous compound A reacts by three independent first order processes as shown in figure with rate constant 2 10 3 10 and 1 93 10 sec for products B C and D respectively If initially pure A was taken in a closed container with P 8 atm then the partial pressure of B in atm after 100 sec from start of experiment 1 0288 A g k k k3 2 B g C g D g 0 577

Which of the following conservation of mass illustrates the law of a Mixing of 10 g of sulphur and 2 g of sand does not show a change in mass b the mass of platinum wire before and after heating remains constant c 2 2 g of propane and 8 g of oxygen produces 10 2 mg of gaseous mixture d 2 8 g of CO and 1 6 g of oxygen gave only 2 24 L ot

The hemoglobin from the red corpuscles of most mammals contains about 0 33 iron Physical measurement indicate that hemoglobin is a very large molecule with a molar mass of about 6 8 x 104 g mol How many iron atoms are there in one molecule of hemoglobin

1 Over the years the thermite reaction has been used for welding railroad rails in incendiary bombs and to ignite solid fuel rocket motors The reaction is Fe O s 2Al s 2Fe Al O s How much Aluminium oxide would be produced if the yield were 93 and iron in iron oxide is 15 g A 12 7 g 13 5 g C 27 g 14 6 g B D

Which of the following reaction involve in Bosch s process used for the manufacturing of H 1 CH3OH 400 C 4 C H6 CO 2H catalyst 2 H CO H O CO 2H 3 3Fe 4H O Fes O4 4H Cracking 2C 3H

RT 80 32 2048x2 63 The rate constant for a first order reaction at 300 C 63 300 C a fan for E 35 KCal for which E is 35 KCal mot and frequency constant is mot ferich 1 45 x 10 1 s1 1 45 x 1011 s will be 1 10 x 10 75 1 2 5 37 x 1010 1 3 5 x 1045 1 4 8 x 10 45 1 The degree of dicci 76 x 2 3 lug 24 25 30 1 43 35 X10 PM RT ferich 1 10 x 10 5 1 2 5 37 x 1010 1 3 5 x 10 45 1 4 8 x 10 45 1 80 40 110 fogkeq tog K A 2 logk log A 89 4

The conductance of a salt solution AB measured by two parallel electrodes of area 100 cm separated by 10 cm was found to be 0 0001 2 If volume enclosed between two electrode contain 0 5 mole of salt what is the molar conductivity S cm mol of salt at same conc Express your answer as molar conductivity in S cm mol x 100 2 X 10cm 100cm Y POCO SHOT ON POCO F1

Column I 1 mole of 0 1 mole of SO 4 gm of He 1 gm of H P Q S T Column II Occupies 22 4 lit at 1 atm 0 C Weighs 32 gms A Collection of N units of given sub Occupies 12 3 lit at 1 atm and 30 Contains 2 g atom of oxygen

CAREER INSTITUTE 51 34 05 mL of phosphorus vapour weighs 0 0625 g at 546 C 5 546 C a 0 1 bar d 34 05 mL and 0 1 bar pressure What is the molar mass of 0 0625 91 TRENRE DE phosphorus A 1 118 42 g mol 2 123 42 g mol 3 128 42 g mol 4 119 42 g mol 546 213 820 1 118 42 g mol 2 123 42 g mol 3 128 42 g mol 4 119 42 g mol 620x6 10X34X10 34 X164 625 X164 X108 X820 mw

Answer the following question 2 Suppose in a twenty item test in math 14 student scores are 10 8 7 11 4 12 6 16 9 7 8 9 17 15 If your score belongs to the third quartile or Q3 What is your score Show your illustration using the Moore and McCabe method A

The enthalpy of formation of methane at 300K is 75 83 kJ mol What will be heat of formation of methane at constant volume at the same temperature Question Type Single Correct Type 1 85 52 kJ mol 2 40 33 kJ mol 3 78 32 kJ mol

Mass of a substance is the amount of matter present in it while weight is the force exerted by gravity on an object The mass of a substance is constant whereas its weight may vary from one place to another due to change in gravity You should be careful in using these terms w my img The mass of a substance can be determined accurately in the laboratory by using an lic ve Fig

25 Which of the following statement is incorrect a Hydrogen is used to reduce NiO b Zirconium is refined by van Arkel method c The sulphide ore galena is concentrated by froth floatation d In the metallurgy of iron the flux used is SiO 2

Q 28 moderate O 4 1 00 17 Retractory materials are used for the construction of furnaces because they Are light in weight Can stand with high temperature O Are leak proof Do not require to be

NEET 201 56 Match items of Column I with the items of column II and assign the correct code A B C D Code A a iii b iv Column I Cyanide process Froth floatation process Electrolytic reduction Zone refining B iv iii i ii iii iv C v iii Column II Ultrapure Ge Dressing of ZnS Extraction of Al Extraction of Au Purification of Ni D i i

An organic compound dissociates into n parallel first order reactions simultaneously and produces P having n different products P P2 P3 Pn rate constants k 2k 3k nk and activation nE respectively energies E 2E 3E Calculate the overall energy of activation of the compound P A 2E 3 2n 1 C E 3 n 1 B E 3 2n 1 D E 3 n 2

Q 96 For the following reaction which description is correct 2XY 1 2X s Y g If XY is KCI then Ops A O Both the reactions can occur simultaneously in the electrochemical cell B C The forward non spontaneous reaction occurs in the electrolytic cell O The backward nor spontaneous reaction occurs in the electrochemical cell The forward non spontaneous reaction occurs in the electrochemical cell D

O g 2e 0 g E 744 4 kJ mole The positive value of E is due to Question Type Single Correct Type 1 Energy is needed to add on 1 electron to O 2 Energy is needed to add on 1 electron to 0 1 3 Energy is released to add on 1 electron to 0 1 4 None of the above are correct

21 An organic compound undergoes first order decomposition The time taken for its decomposition to 1 8 and 1 10 of its initial concentration are t1 8 and 11 10 respectively What is the value of 2 303 4 log t 4 log102 0 3 k 11 8 10 11 10

Which of the following statements is incorrect in the context of the B F bond in BF3 A B The bond energy of B F bond is very high than for any other single BF bond Correct Answer The unusal shortness and strength of BF bond may be explained by p d interation between boron and fluorine atoms C The unusal shortness and strength of BF bond may be explained by p p interaction hotwoon horon and fluoring

Which of the following is correct for nature of graph as per Moseley s X ray experiment A vs atomic mass is linear B vvs atomic mass is linear C v vs vapour density is linear D vs atomic number is linear where v frequency of X rays emitted