General Questions and Answers

92 Which of the following is a redox reaction 1 NaCl KNO3 NaNO3 KCI 2 CaC 04 2HCl CaCl2 H C 04 3 Mg OH 2 2NH4Cl MgCl 2NH4OH 4 Zn 2AgCN 2Ag Zn CN 2

6 What is the approximate pH of a solution composed of 0 2 M tyrosine and 0 02 M HCl Assume you are protonating the carboxyl group The three pK s for tyrosine are 2 2 9 1 and 10 1 side chain pK

14 4 1 0 The E for the following cell is 0 34 V In s In OH 3 aq SbO aq Sb s Using E 1 0 V for the In OH 3 In couple calculate E for the SbO Sb half reaction A 1 34 C 0 82 AA B B B 0 66 D 0 66

9 NO reacts with O to form NO When 10 g of NO is formed during the reaction the mass of O consumed is A 1 90 g B 5 0 g D 13 9 g C 3 48 g 0 The mass of 60 HCl by mass required for the

7 Which of the following has the highest mass A 20 g of sulphur B 4 mol of carbon dioxide C 12 x 1024 atoms of hydrogen D 11 2 L of helium at N T P 46

The wave functions of 3s and 3p orbitals are given by 0 angle with z axis 43s 9 P3P 1 1 1 2 Z a 3 2 6 3 2 4ZT ap 3 9 6 4x ag from these we can conclude 2zr 32 4 z 9 e Z3 cose Number of nodal surface for 3pz and 3s orbitals are equal The angular nodal surface of 3p orbital has The radial nodal surfaces of 3s orbital and 3pz orbitals are at equal distance from the nucleus 3s electron have greater penetrating power into the nucleus in

Table 1 Answers Q 16 Q17 and Q 18 by appropriately matching the information given in the three columns of the following table Column 2 Column 3 W 0 p q 0 AU 0 q q 0 AU 0 r q 0 AU 0 Column 1 a Reversible cooling of an ideal gas at constant volume b Reversible isothermal expansion of an ideal gas c Adiabatic expansion of non ideal gas into vacuum d Reversible melting of sulphur at normal melting point P Q R S W 0 W 0 W q Prob 16 Which of the following are the correct options A a P p C a P r A s q 0 AU 0 B a P q D a P s Sol Prob 17 Which of the following are the correct options A b R s B b Q p

b As the interaction between the nucleus and the electron determines the structure of the energy levels of the H atom any quantum object that has a positively and a negatively charged particle with no other interactions should have a similar structure of energy levels Consider a very unusual H atom where the positively charged particle is a positron the antimatter particle of the electron same mass as the electron but opposite charge Calculate the first two energy levels for this unusual atom in eV What wavelength in nm for a transition between these two energy levels

f the atomic number of an element X is 27 then deduce the possible values of four quantum numbe he 20th electron of element X 15 25 2p 363845 is

4 The decomposition of N O according to the equation 2N O5 g 4NO2 g O2 g is a first order reaction After 30 min from the start of the decomposition in a closed vessel the total pressure developed is found to be 284 5 mm of Hg and on complete decomposition the total pressure is 584 5 mm of Hg Calculate the rate constant of the reaction 1991

Illustration 3 23 Calculate the volume strength of H O solution if 50 mL of H O solution is diluted with 50 mL of H O 20 mL of this diluted solution required 40 mL of M 60 K Cr O solution in presence of H SO4 for complete reaction Sol HO

0 5 grams of a week base BOH present in 50 ml solution is titrated with 0 1 M HCI T pH at half neutralization is found to be 9 and the pH at equivalence point is found be 5 15 The equivalence conductance of BOH at infinite dilution is 400 Scm eq Choose correct option s THE NADAYANA GROUP A Initial concentration of BOH is 0 1 M B pK of BOH is 9 C degree of dissociation of BOH is 0 01 C conductivity of BOH solution is 4x10 Sem

Select process which is are exothermic AH ve Question Type Multiple Correct Type 1 2 3 He g Lig He g O g S g O g S g Conversion of tetrachloridocobaltate II ion to hexaaquacobalt II ion in aqueo solution dioxygenium ion e molecular oxygen

The equilibrium constant K is related to E cell and not El Conductivity of an electrolytic solution decreases with the decrease in concentration What is a fuel cell What is its main advantage What are the reactions occuring at the Cathode and Anode of a Leclanche cell

9 The colligative property of a colloidal sol compared to the solution of non electrolyte of same concentration will be 1 Same 3 Lower C 11 2 Higher 4 Higher or lower BRICACE

h of the following occupies maximum volume at NTP 02 x 1022 molecules of CO i 8 g of oxygen iii 17 g of NH iv 0 2 mol of N

1 5 mixture of SiO and Fe2O3 on very strong heating leave a residue weighing 1 46 gm The reaction responsible for loss of weight is Fe2O3 s Fe3O4 s O g What is the percentage by weight of Fe O3 in original sample a 80 b 20 c 40 d 60 Three mole of potassium chlorate KC103 is thermally decomposed and excess of aluminium Al is burnt in the gaseous product How many moles of aluminium oxide Al O3 are formed

Compound x have its observed weight in a magnetic balance more than its actual weight determined by using a non magnetic balance Number of compounds from the following list which can be compound x are MnO Fe O4 CrO Mn NaC1 ZnS Answer Enter your answer here

19 The effective number of atoms per unit cell in a simple cube face centred cube and body centred cube are respectively a 1 4 2 b 1 2 4 c 8 14 9 d 8 4 2 20 What would be the effective number of atoms per unit cell in end centered cubic unit call if

Carefully observe the following figure and answer the questions that follow Ag Battery Ag Agt Spoon AgNO3 aq i Write what you will observe after allowing the current to pass through this electrolyte for 20 to 30 minutes ii Write two practical applications of the process depicted in the

2 4 1 0 The rise in boiling point of a solution containing 1 8 g glucose in 100 g of a solvent is 0 1 C The molal elevation constant of the liquid is A 1 Cm C 3 Cm A A B B B 2 Cm D 4 Cm You Missed

MeCOOEt i NH NH ii HNO iii OH B C Which of the following statements are correct about the given reactions sequence a The compounds B and C respectively are Me N C 0 and MeNHCOOMe MeOH b The compounds B and C respectively are Et N C 0 and MeNH c The reaction proceeds via the formation of acyl nitrene MeCON as the intermediate species d The reaction proceeds via the formation of acyl nitrene E CON as the intermediate species

a 0 4 4 Dinitrodiphenyl is obtained when 4 nitrochlorobenzene is heated with Na ether b 4 nitroiodobenzene is heated with copper powder in a sealed tube c diphenyl is heated with a mixture of conc HNO3 conc H SO4 d nitrobenzene is treated with 4 nitro chlorobenzene in presence of anhyd AlCl3

Which of the following solutions can completely without leaving any reactant in the end oxidize 100 ml H O2 sample labelled 4 54 volumes in acidic medium Assume volume strength is defined at STP condition 100 ml of 0 08M Ba MnO4 2 sample 80 Oml of 0 5M K Cr 07 sample 3 16 ml of 1M KMnO4 sample O200 ml of 0 05 M K Cr O7 sample

at a particular temperature T complex NiBr2 PPh3 2 exhibits diamagnetism while at another temperature T2 this complex exhibits paramagnetism Maximum number of atoms in same plane in complex at temperature T x otal number of axial orbitals used for hybridisation in central metal at T temperature y X upto two decimal places is V he value of

In the reaction 2Al s 6HCl aq 2A1 aq 6C aq 3H g 1 2 3 Correct Answer 4 ZAPADN our Answer 3 6L HCl aq is consumed for every 3L H g produced 33 6 LH g is produced regardless of temperature and pressure for every mole Al that reacts 672 L H g at 1 atm and 273 K is produced for every mole Al that reacts 11 2 L H g at 1 atm at 273 K is produced for every mole HCl aq consumed

How many Li atoms are there in 0 432 moles of Li What would you multiply atoms of lead by to get the units moles of lead atoms Pb x atoms moles Xe x number number unit number unit What would you multiply moles of xenon by to get the units atoms of xenon moles Pb unit atoms Xe 11

6 4 1 0 What is the osmotic pressure of 12 solution of canes sugar molecular weight 342 at 17 C A 7 30 atm B 8 35 atm C 8 50 atm D 7 35 atm A A

4 2MnO4 3H O 2MnO 30 2H O 2OH 100 mL of a water sample contains 0 81 g of calcium bicarbonate and 0 73 of magnesium bicarbonate hardness of this water sample expressed in terms of equivalents of CaCO3 is molar mass of calcium bicarbonate is 162 g mol and magnesium bicarbonate is 146 gmol 1 1 000 ppm 2 10 000 ppm 3 100 ppm JEE MAINS ONLINE 2 4 5 000 ppm ONLINE

Why were fresh fruits and vegetables used in some recipes for this laboratory canned used for the other recipes and frozen used for still other recipes Describe the pros and cons for using each form

Column I Chemical reaction P I SO 2H O SO2 2T 4H 4 Q 3C10 Br BrO 3Cl R 2 ZnS 30 2 ZnO 2SO S Br 2OH BrO Br H O Column II No of mole of electron transfered per mole reaction 1 6 2 12 3 1 4 2

Four elements have the following first ionization energies in kJmol 762 709 659 and 558 The elements are Ga Al In and TI not in order Which of these elements has the ionization energy of 762 kJmol In

What is the slope and inverse slope of this graph Time seconds 125 100 75 50 25 0 10 2 15 4 Table 2 10 mL 0 5 1 0 IKI and 5 mL 3 H2O2 120 23 6 35 8 10 54 74 12 14 16 mL water displaced 89 18 105 20 22 I

The ammonia ammonium hydroxide is completely used NiCl2 6H O to form a stable coordination compound Assume that both the reactions are 100 complete If 1584 g of ammonium sulphate and 952g of NiCl2 6H O are used in the preparation the combined weight in grams of gypsum and the nickel ammonia coordination compound thus produced prepared by with sulphate treating calcium by is Atomic weights in g mol H 1 N 14 O 16 S 32 CI 35 5 Ca 40 Ni 59

35 The reduced volume and reduced temperature of a gas are 10 0 and 0 725 respectively If the critical pressure of the gas is 47 058 atm Then the pressure of the gas is given data as per units V lt P atm T K b lt mol Q atm lt mol

4 Consider the half cell reduction reaction Mn 2e Mn E 1 18 V Mn Mn e E 1 51 V The E for the reaction 3 Mn2 Mn 2 Mn and possibility of the forward reaction are respectively 1 2 69 V and no 2 4 18 V and yes 3 0 33 V and yes 2 69 V and no AY

3 III II V IV I 4 V III II IV I 1 cc of 0 1 M HCI is added to 999 cc solution of 0 1 N NaCl The pH of resulting solution will be 1 7 3 2 2 4 4 1 76 2 V IV I 3 III II V IV I 4 V III N 1 1 cc 0 1 M HCI face 1 7 3 2 999 cc 0 1 N pl and a

2 d State Heisenberg uncertainty principle What is the uncertainty in the position of a bullet of 4 gm that is known to have a speed between 380 0001 m s and 380 0000 m s 1 2 3

2 A system has 50 000 molecules at enery level 1 10 000 molecules at energy level 2 and 500 molecules at energy level 5 What is the energetic entropy of the system What is the energetic mutliplicity of the system

27 If three forces 10 N 20 N and 10 N act at a point and angle between the first two orces is 30 and angle between the latter two forces is 60 then calculate the value of he resultant force a 33 85 N b 5 77 N c 8 66 N d 10 N

Kinetics of Nuclear Decay The activity of the radioactive sample drops to 1 64 of its original value in 2 hr find the decay co

Which option is correct when Cl2 reacts with excess of F2 Max score 1 Neg score 0 CIF5 is formed and the oxidation state of F is 3 and that of Cl is 1 FCl3 is formed and the oxidation state of F is 1 and that of Cl is 3 CIF3 is formed and the oxidation state of F is 1 and that of Cl is 3 CIF3 and FCl3 are formed

Which of the following is are correct statements A Particles of every matter is very very small B Particles of matter have spaces or gaps between them C Universe is made up of matter and energy D Anything which has capacity to do work is called matter

c 3 4 nm 39 Isoelectronic species are a CO CN NO C b CO CN NO C c CO CN NO C d CO CN NO C 0 TL 2000 tointu in momentum of an electron V 48 L

20 mL of CO was mixed with 50 mL of oxygen and the mixture was exploded On cooling the resulting mixture was shaken with KOH Find the volume of the gas that is left

2 VOSO 3 Na VO4 4 V H O JSO H O How many gram of KCI would have to be dissolved in 60 g H O to give 20 by weight of solution 1 1 5 g 2 15 g 3 25 g 4 V H O JSO H O 20 fe 4 12 g 2 VOSO 3 Na VO 86 KCI 1 1 5 g 3 25 g 2 15 g 4 12 g

In Bohr series of lines of hydrogen spectrum the third line from the red end corresponds to which one of the following inter orbit jumps of the electron for Bohr s orbits in an atom of hydrogen 1 32 2 5 2 3 4 1 4 2 5

Mock Test 4 for NE 130 If 0 1 g atom of magnesium is allowed to react with 2 g 130 Mg0 1 con molecule of oxygen then which of the following is correct faff for an for given equation 2 Mg s O g 2 MgO s 1 Oxygen is the limiting reagent 2 Magnesium is the limiting reagent 3 0 02 moles of magnesium oxide are formed 4 0 5 mole of oxygen remain in excess 31 Calculate the molecular weight of a substance which fo Fin 2 Mg s O g 2 MgO s Biftet i 1 f fefta 1 2 14 3 0 02 4 30 5

66 gm sample of an oxalate salt AlxHy C O4 z nH O is dissolved in water to from 500 ml solution 50 ml solution requires 60 ml 0 5 M Ba OH 2 and 240 ml 0 1 M KMnO4 in acidic medium separately If in salt x y z n are present in simplest ratio Then select the correct statement s O Moles of oxalate salt in original sample is 0 2 O Ratio of y z is equal to 1 O Value of x y z n 5 O Number of oxalate ions per molecule of oxalate salt is 2

14 Consider the column I and II Column I P NH excess Cl Q Ca OH Cl Slaked lime R NaOH Cl Conc S NH Cl excess Correct option is P 1 1 2 1 3 4 4 4 Q 4 4 2 1 Column II 1 NC3 2 oc 3 CIO 3 4 R 3 M 2 3 2 S233 1 114 4 5 P NE Q C SI R Na Co S NH Fra fa P 1 1 2 1 3 4 Car