Chemical Bonding Questions and Answers

The standard potentials for two nonadjacent species can also be calculated by using the concept that AG as an additive property but potential is not an additive property and AG nFE If a given oxidation state is a stronger oxidising agent than in the next higher oxidation state disproportionation can occur The reverse of disproportionation is called comproportionation The relative stabilities of the oxidation state can also be understood by drawing a graph of AG F against oxidation state known as Frost diagram choosing the stability of zero oxidation state arbitrarily as zero The most stable oxidation state of a species lies lowest in the diagram Disproportionation is spontaneous if the species lies above a straight line joining its two products species Question 32 Which of the following couple have same value of potential at pH 0 and pH 14 Options CIO CIO

Excess sodium sulfide is added to 79 8 mL of silver nitrate solution The precipitate is collected and dries and the mass is found to be 4 51 g What wa the concentration of the silver nitrate solution Select one a 0 456 b 0 350 X c 0 650 d 0 0364 e 0 450

Electron gain enthalpy with negative sign of fluorine is less than that of chlorine due to A B High ionization enthalpy of fluorine D Smaller size of chlorine atom C Smaller size of fluorine atom Bigger size of 2P orbital of fluorine

0 7 grams of Na2CO3 xH O were dissolved in water and the volume was made to 100 mL 20 mL of this solution required 19 8 mL of N 10 HCI for complete neutralization The value of x is Report your answer by rounding it up to nearest whole number

Which amongst the following compounds ii K PtCl3 C H4 iv Ti 0 C6H5 4 organometallic i Al2 CH3 6 iii N CH3 3 Question Type Single Correct Type 1 i only 2 iii and iv only 3 i ii and iii A i and ii only

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

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

Arrange the following alkyl halides in order of dehydrohalogenation C HsI C H5C1 C HsBr C HsF 1 C HsF C H5C1 C HsBr C HsI 3 C HsI C HCl C HsBr C HsF 2 C Hsl C HsBr C HCl C HsF 4 C H F C HCl C HsBr C H5C1

A 5mL pure liquid toluene dissolved in 100 mL of dil alkaline KMnO4 and refluxed to change to benzoic acid with formation of dark brown precipitate of MnO2 s The precipitate and filterate separated The precipitate redissolved in 100 mL of 1M acidified solution of Na2C204 and excess oxalate required 50 73 mL of 0 1M acid dichromate for back titration The 10 5 mL filterate selected acidified with dil H2SO4 and titrated with 38 mL of 0 1 M Na2C204 under hot conditions at end point Report the molarity of original KMnO4 s integer answer

60 An ideal mixture of two liquids A and B is put in a cylinder containing piston Piston is pulled out isothermally so that the volume of liquid decreases but that of vapours increases Negligibly small amount of liquid was left and mole fraction of A in vapour is 0 4 If P 0 4 and P 1 2 at at the experimental temperature which of the following is the total pressure at which the liquid is almost evaporated 1 0 22 atm 3 0 667 atm 2 0 431 atm 4 1 atm

Hydrazine was taken in a constant volume container at 27 c and 1 0 atm and equal moles of oxygen gas were introduced sealed and heated following equlibria established N H4 3022NO2 g 2H O Kp 4 N HN 2H Kp N H H 2NH3 KP3 k The gaseous mixture on passing through moisture absorbent a decrease of 360 mm in equilibrium pressure observed The dried gaseous mixture passed through Ammonia absorber a further decrease of 20 mm in equilibrium pressure observed After calculating Kp2 report the value of KP3

hard acid O O O O a is not very polarisable O b large ionic radius c show a preference for donor atoms of low electronegativity d show a preference for donor atoms of high electronegativity

6 When NO is cooled to room temperature some of it reacts to form a dimer N 04 2 2 through the reaction 2NO g N O4 9 2 In a reaction 15 2 g of NO is placed in a 10 0 L flask at high temperature and the flask is cooled to 25 C The total pressure is measured to be 0 500 atm Thus partial pressure of NO2 is found to be a 0 19 atmest b 0 31 atm c 0 10 atm d 0 40 atm

ample 17 Container I and II contain H SO and oleum respectively H SO4 100 g in 1 L solution Oleum 100 g in 1 L solution HH Container l Container II If 0 1 M NaOH is added in Container I then it required x L NaOH for complete neutralis while Container Il required 1 09x L NaOH for complete neutralisation The tap in conta Il is now opened and oleum mixture is allowed to drip from Container II at 2 g s ther minimum time in s to the nearest integer after which Container II will require x L of N for complete neutralisation is Density of solution of container II is 1 4 g ml 1

neet prep Chemical Bondi March 2021 Which one of the following pairs is isostructu having the same shape and hybridization 1 BCls and BrCls 2 NH3 and NO 3 NF and BF3

For the process H O 1 H O g at T 100 C and 1 atmosphere pressure the corre choice is 1 ASsystem 0 and A Surrounding 0 2 ASsystem 0 and A Ssurrounding 0 3 ASsystem 0 and A Surrounding 0 4 AS system 0 and A Surrounding 0

2 When H SO3 is converted into H SO4 the change in the oxidation state of sulphur is from 1 0 to 2 2 2 to 4 3 4 to 2 4 4 10 6 3 respect 1 4 3 2 4 3 3 2 3 4 2 3 8 Which 1 HNC

c 38 For the cell reaction Fe 2Fe 3Fe2 which is not possible a One cell can be constructed b Three different cells with different Ecell are possible c Three different cells with different number of electrons used in redox reaction are possible d Three different cells with same AG value a possible

2 If 100 g of Na SO4 is dissolved in 200 g of H O and the solution is cooled until 100 g of Na SO4 10H O crystallizes out find a The composition of the remaining solution mother liquor b The grams of crystals recovered per 100 g of initial solution

a Zero Dipole moment of water is 1 84 D which indicates that water molecule a linear symmetrical b linear non symmetrical c nonlinear symmetrical d nonlinear nonsymmetrical length range in nmn of microwave radiation is

c passing through origin d with positive intercept on PT axis 7 Expected value of dipole moment in Debye units in case of p dichlorobenzene is a zero b one c two d six If bond moment of nitro group is u then expected dipole moment of m dinitrobenzene is 6

15 pts For the reaction N g 3H 2NH3 g the equilibrium constant is Kp 1 245 at 400 K A mixture have the following compositions at 400 K and a total pressure of 1 00 bar 0 0983 mol N2 g 0 136 mol H g and 0 0706 mol NH3 g Suppose that 0 100 mol N2 g is added at constant pressure to this mixture What will be the partial pressure of H2 g after equilibrium is established in this mixture a b C d 0 7149 atm 0 7373 atm 0 1520 atm 0 3697 atm X

The correct order of bond length of Si O P O S O and C1 O in SiOH POH SOH2 CIOH Answer A Your Attempt Correct answer CIOH SOH POH SiOH B SiOH4 POH SOH CIOH POH SiOH4 1 SOH CIOH Rat

Amongst Co ox CoF and Co NH3 6 1 Co ox and CoF are paramagnetic and Co NH3 is diamagnetic 3 2 Co ox and Co NH3 6 are paramagnetic and CoF is diamagnetic 3 Co ox and Co NH3 are diamagnetic and CoF is paramagnetic 4 Co NH3 and CoF are paramagnetic and Color 1 is diamagnetic 13

10 The mechanism of enzyme catalysed reac tion is given by Michaelis and Menten as step I E SES fast step II ESP E slow The rate of product formation may be K K E S dP given as where dt K K K S El is the total enzyme concentration For an enzyme substrate system obeying sim ple Michaelis and Menten mechanism the rate of product formation when the substrate concentration is very large has the limiting value 0 02 mol dm At a sub strate concentration of 250 mg dm the rate is half this value The value of K K in dm kg assuming that K K is

Select the correct matching List I Metal ions 1 XeF4 2 XeF6 3 XeO3 4 XeOF 2 1 1 D 2 C 3 A 4 B 1 A 2 B 3 C 4 D 3 1 B 2 A 3 C 4 D List II Magnetic moment BM A Pyramidal B T shape C Distorted octahedral D Square planar 4 1 C2 A 3 A 4 B The no of bonds in the compound P4010 is AAJ KA TOPPER

Number of Sigma bonds in Al CH3 and I C are Then the value of Your answer x y z 4 is x and y is the number of lone pairs on one I central atom in

It is clearly seen that B O of 02 B2 then how c is corr ect Please help me as soon as possible Please don t dela y to answer my question Choose correct option Ind a Phosphinic acid Phosphonic acid Phosphoric acid reducing property b Chloric acid Bromic acid Iodic acid CH HB ALO Acidic strength c C2 B2 02 Number of a bond BOL 1 1 5 d SO SO SO3 S O bond length 4 1 a b c d 3 b c d 2 a c d x 4 a d

A B C D Column I Process N N Li Li 0 0 B B Column II Change in Property P Magnetic moment Q Bond order R Magnetic Property S Number of anti bonding e T Number of bonding e

Consider the following table Element Atomic number A B C D 18 10 13 12 Which of the given statements is are correct a The compound formed by elements A and D ionic in nature b The compound formed by elements B and D soluble in kerosene c The compound C A3 is amphoteric in nature d Aqueous solution of compound AB conducts electricity

4 On the basis of the following thermochemical data AH 0 H O 1 H aq OH aq AH 57 32 kJ H g O g H O 1 AH 286 20 kJ The value of enthalpy of formation of OH ion at 25 C is

Column I Compound A Et Me B C D CI Br Br CI Br 1 A p B r C q D p 2 A p B r C q D q 3 A p B r C s D q 4 A r B s C q D q Column II Number of stereoisomers P 2 q 3 r 4 s 6 M45

4 Number of optically active isomers 63 Consider the following ALWAY Compound Parama Square planner Synergic gnetism geometry bonding A NiCl 1 B Ni CN 12 C Ni CN D Ni CO X X How many codes are incorrect 1 2 3 3 X 2 1 4 0 X 348482 X 503 OVETRIES 41234 THERE 63 Te alifica A NiC B Ni CN 12 C Ni CN D Ni CO angweile 1 2 3 3 ari zenera Farfacra X ex fandt ants To frefua 2 3d8 2 1 4 0 30 1 1 1 1 1 1 1 1 pane e IUB 03 NIK P3 3olf

rrect order of strength of H bond H O NH H O NH HF H OX H HF type species are total 10 89 Hef het 1 H O NH3 2 H O NH 3 HF H O 4 NH HF P 0

A buffer solution is made that is 0 317 M in H S and 0 317 M in NaHS If K for H S is 1 00 x 10 7 what is the pH of the buffer solution pH Write the net ionic equation for the reaction that occurs when 0 077 mol HCl is added to 1 00 L of the buffer soluti Use the lowest possible coefficients Omit states of matter Use H O instead of H

The Lewis symbol for an atom consists of an elemental symbol surrounded by a one dot for each of its valence electrons b one dot for each of its valence shells c one dot for each of the electronic sublevels d one dot for each of the principle quantum levels

Que 4 From the following thermochemical equations find out dissociation energy of CH3 H bond CH31 g CH3 g I g CH4 g 12 s CH31 g HI g HI g H g I g 12 s 21 g 108 8 kcal mol 213 8 kcal mol 133 8 kcal mol AH 54 0 kcal AH 29 0 kcal AH 79 8 kcal AH 51 0 kcal

Which of the following pairs represents linkage isomers 1 Pd PPh NCS and Pd PPh SCN 2 CO NH NO So and CO NH SO NO 3 PICI NH Br and PtBr NH CI 4 Cu NH PICI and Pt NH CUCI

3 for the CO2 lon the two negative charges indicate that there are two additional electrons than those provided by the neutral atoms For NH on one positive charge indicates the loss of one electron 40 from the group of neutral atoms

Which of the following order is incorrect according to MOT 1 B B F F Bond Energy 2 B B F F Bond Length 3 N N 0 0 Bond Energy 4 C C 0 0 Bond Length

O 50 The standard reduction potential at 25 C for the reaction 2H O 2e H 20H is 0 8277 volt The equilibrium constant for the reaction 2H O 1 10 12 H O OH at 25 C is 2 10 14 3 10 11 4 10 8

An antibiotic form of Penicillin is found to show weak monoprotic acid behaviour as HP H P K 1 64 10 13 where HP is parent acid and Pis conjugate base A pH range of 4 5 to 5 0 at 25 C is necessary for growth of penicillin containing moulds Which of the following is correct about the solution formed when a tablet containing 0 12 M sodium salt of penicillin NaP is dissolved in a glass of water

At high pressure the molecular distance between gas particles appl 5 Which of the following pairings is incorrect in describing the spin states of d electrons in complexes Tetrahedral low spin Square planar low spin Octahedral Strong field ligand low spin Octahedral Weak field ligand high spin

5 The IUPAC name of the following compound is CH3 CH CH CH CH CH CH CHCH3 1 2 8 dimethyl 3 6 decadiene 2 1 1 7 7 tetramethyl 2 5 octadiene 3 2 8 dimethyl deca 4 6 diene 4 3 9 dimethyl 4 6 decadiene C H5

N and O are converted to mono positive cations N and O respectively Which is incorrect According to Molecular orbital theory 1 N becomes diamagnetic 3 In O the bond order increases 2 In O paramagnetism decreases 4 In N the N N bond is weakened

28 8 why Is Which of the following statement CORRECT incorrect A Orbital means electron density same B For orbitals with the same quantum number same shape the larger the orbital the higher the energy Experimentally we can measure the shape of an orbital 10 doidW C TRUE aceaeplo lo aaayt adtwollo D The 2s and 2p orbitals are degenerate for a carbon Atom xatons laswol WIJ 6

In which of the following are the crystal field cleavage and crystal field stability energies in Dq for Ni H2O 6 Cl2 are respectively given correctly A 10 Dq 12 Dq 3 10 Dq 8 Dq C Dq 10 Dq D 12 Dq Dq E 8 Dq 10 Dq

Incorrect statement among the following is O Number of o and bonds in ethene TT respectively are 5 and 1 O In PC15 three P Cl bond lie in one plane and make an angle of 120 with each other O In SF6 hybridization is sp d O BrF5 is trigonal bipyramidal in shape

Incorrect statement among the following is O Number of a and TT bonds in ethene respectively are 5 and 1 O In PC15 three P Cl bond lie in one plane and make an angle of 120 with each other In SF hybridization is sp d O BrF is trigonal bipyramidal in shape

J Valence Shell Electron Pair repulsion VSEPR theory is used to predict which of the following a Energy levels in an atom b The shapes of molecules and ions c The electron densities of elements d The type of bonding in compounds