Chemical Bonding Questions and Answers

Consider the resonance hybrid of the formate ion HCO shown below Which of the following best represents the charge of each oxygen in this structure 1 O 2 3 1 1 2 2 3 1 2 1 3 C 0 H C

The magnetic moment of NiX41 ion is found to be zero Then the ion is X monodentate anionic ligand Question Type Single Correct Type 1 sp hybridized 2 spd2 hybridized

22 Fe 3 is more stable than Fe 2 the reason is are I 1st and 2nd I P difference is less than 11 0 eV III 2nd and 3rd IP difference is less than 11 0 eV The correct answer is 1 Only I 2 Only II II Core of Fe 3 is more stable IV IP of Fe 3 is high 3 I II and IV 4 II and I

71 The electrical resistance of 0 08 M caustic soda solution is 5 x 10 when placed in a column of diameter 2 cm and length 50 cm T conductivity of the solution is Take the value of n 3 A B 300 S cm 1 300 S cm CO300 Sam D O1 300 S cm 66822

Q6 Calculate the lines n spectrum produced in Paschen series when electron gets De excited from 5th shel and what will be the region of the spectrum 1x2 2

in heating an organic compound strongly with metallic sodium one frequently observes the formation of a blck material which is insoluble in water What might this black substance be and why is it formed

The molecular orbitals of 1 3 butadiene not in proper order are given below f1 f2 f3 f4 are the 2p orbitals on carbon atoms 0 372f1 0 602f2 0 602f3 0 372f4 V2 0 602f 0 372f2 0 372f3 0 602f4 V3 0 372f1 0 602f2 0 602f3 0 372f4 V4 0 602 1 0 372f2 0 372f3 0 602f4 The correct order of the orbitals with increasing energy is A C V1 V2 V3 V4 V3 V4 V1 V2 B D W3 V2 V4 V1 V4 V3 V2 V1

Variable valency is exhibited by ans Transitional elements Representative elements None of the above Inert gas

What do these line mean i The H H bo nd dissociation enthalpy is the highest for a single bond between two atoms o f any element ii It is because of this fal ctor that the dissociation of dihydrogen into its atoms is only 0 081 around 2 000K which increases to 95 5 at 500 OK iii Also it s relatively inert at room t emperature due to the high H H bond e nthalpy

Uza Which of the following is are correct A vander Waal s radius of iodine is more than its covalent radius B All isoelectronic ions belong to the same period of periodic table C First ionisation energy of Be is more than that of C D Electron affinity of N as well as noble gases is negative How many nodal suface can be present in the molecular orbital formed by the overlap of sand p x ax the molecular axis A 2 D None of these B 1 C 3 Which of the following show intramolecular hydrogen hor 57

Purpose What was the purpose s of this experiment Use your own words DO NOT just copy the objectives goals from the lab document Evaluate the data What were the major results Were the results bad mediocre good or excellent Explain Your results should include the identity of your unknown Good results mean that you was able to use the tests to easily identify your unknown Make sure you briefly explain how you were able to identify

Match Column l Compounds A Tetrachloroethene B NO C NO D CO P Q R Column II Characteristics Liquefaction of it is due to London forces only Used as a solvent for dry cleaning At least one atom is sp hybridized Bond order of at least one bond is greater than 2 S T Odd electron species

anthanide contraction means A Contraction of atom of lanthanum element due to poor shielding of d subshell electron B Contraction of atom of lanthanum element due to high shielding of d subshell electron C Contraction of atom of elements after lanthanum due to poor shielding of f subshell electron D Contraction of atom of elements before lanthanum due to poor shielding of f subshell electron

Which statement is NOT true A The carbon adjacent to a carbonyl group can form a resonance to stabilize a carbanion intermediate B A carbonyl carbon can be made less electrophilic by a nearby metal ion C The carbon adjacent to an imine can form a resonance to stabilize a carbanion intermediate D An adjacent carbonyl group can promote decarboxylation of an keto acid by promoting the breaking of a carbon carbon bond

For the reaction X s Y s Z g the plot of In PZ versus Pz pe T solid line where pz is the pressure in bar of the gas Z at temperature T and pe 1 bar Pz In po AH 3 7 Given d In K d R the gas constant R 8 314 J K mol 10 12 104 104 T K 1 is given below in where the equilibrium constant K and Pz po

Question No 69 Single Correct A A Identify the number of compounds which can exist 3 PbF4 Bils TIF3 Tel3 2 3

Boiling point of H Se is higher than H S this is 82 best explained by 1 Highest extent of hydrogen bonding in H Se 2 Higher polarity of H S 3 Higher polarity of H Se 4 Higher dispersion forces in H Se due to its higher molecular weight

54 AB g is dissociates as AB g AB g B g When the initial pressure of AB is 800 torr and the total pressure developed at equilibrium is 900 torr What fraction of AB g is dissociated 1 10 2 20 3 25 4 30 54 AB g fafara AB g AB g B g AB 4900 AB g fandall were fecifed gan 1 10 3 25 2 20 4 30

16 What is the effect of the addition of sugar on the boiling and freezing points of water O a Both boiling and freezing points increase O b Both boiling and freezing points decrease c Boiling point decreases and freezing point increases d Boiling point increases and freezing point decreases

Balloons of 4L capacity are to be filled with Hydrogen at a pressure of 1 atm and 273 from an 8L cylinder containing Hydrogen 10 atm at the same temperature The nu ber of balloons that can be filled is 1 20 2 18 3 40 4 38

Why in the Geometry of BrF5 is the lone pair is in axial Case 1 when the lone pair is in equatorial plane me ans the Lone Pair bond pair repulsion would be only 2 but in the first case it is total of 4 1 one pair bond pair repulsion then how it co mes out to be the structure of BrF5 used in various places

Which compounds is are not possible for C4H8O A Aldehyde B C D Saturated Alcohol Cyclic ether Ester

Generally metal oxide are basic and non metal oxide are acidic in nature The hydrolysis of oxide can form hydroxide or oxyacid depending upon the nature of oxide Which of the following statement is are CORRECT 0 C120 is the suboxide of carbon having non cyclic structure 0 Boric acid is act as non proton donor weak tribasic acid Metaphosphoric acid having same basicity as number of P present in it In H S O5 S O S linkage is present and both S is sp hybridised

2 QUESTION 5 Pls calculate arrange below substances by increasing of lattice energy using

Collision theory explains how chemical reactions occurs Using this theory and kinetic molecular model which of the following influence the rate of reaction Temperature of the system The geometry or orientation of collision The velocity of the reactants at the time of collision Concentration of reactants

A gas shows following graph at 25 C Density A B Ideal gas Amongs the following select correct option s for gas C Pressure Realgas A In the Low pressure region the gas is less compressible than ideal gas at 25 C Boyle temperature of gas must be more than 25 C Molar volume of gas is less than that of ideal molar volume at 25 C in low

A Figure 1 16 Potential energy and kinetic energy The potential energy initially motionless bicycle and rider at the top of the hill is converted to kinetic energy as the bicycle moves down the hill and loses potential energy All other forms of energy the energy stored in a stretched spring in a weight held above your head or in a chemical bond are classified as potential energy An object ha potential energy by virtue of its position relative to other objects Potential energy is in essence the stored energy that arises from the attractions and repulsions an object eriences in relation to other objects is converted into

D Classify following into carbohydrates protein fat vitamin Cereals ghee paneer wheat meat papaya milk egg bhakri cucumber orange fi oll carrot carbohydrates Protein Fat Vitamin

ICI has 5 CI 1 Cl bond angles 90 and it has octahedral arrangement of bonding and non bonding electrons with lone pairs of central atom cis to each other SC and I are non linear and iso structural Maximum number of T bonds present in same plane in C3 S2 molecule is two B H6 Al2 CH3 6 polymeric BeH contain 3 centre 2electron bond

No 13 Among the following linear combination of atomic orbitals the CORREC representation of the lowest unoccupied a molecular orbital of butadiene is y 0 372 1 0 602 2 0 602 3 0 372 64 Y 0 602 10 372 2 0 372 0 602 P 0 602 1 0 372 02 0 372 3 0 602 Y 0 372 1 0 602 2 0 602 03 0 372 4

chemical behaviour of the first member of a group of elements in the s and p blocks compared to that of the subsequent members in the same group The anomalous behaviour is attributed to their small size large charge radius ratio and high electronegativity of the elements In addition the first member of group has only four valence orbitals 2s and 2p available for bonding whereas the second member of the groups have nine valence orbitals 3s 3p 3d As a consequence of this the maximum covalency of the first member of each group is 4 e g boron can only form B 88 Al 143 BF4 whereas the other members of the groups can expand their valence shell to accommodate more than four pairs of electrons e g aluminium AlF forms Furthermore the first member of p block elements displays greater ability to form p P multiple bonds to itself e g C C C C N N N N and to other second period elements e g C O C N C N N O compared to subsequent members of the same group

als i All orbitals of the same shell in the absence of magnetic field possess same energy i e they are degenerate ii All orbitals of the same subshell differ in the direction of their space orientation 2 iii Total number of orbitals in a main energy shell is equal to n but not more than 16 in any of the main shells of the known elements n 1 No of orbitals 1 1 1s n 2 No of orbitals 2 2 4 2s 2 px 2py 2pz No of orbitals 3 9 3s 3 px 3 py 3 pz 3dxy 3d 3d a n 3 3d

3 The isomerism exhibited by the co ordination compounds Cr H O 6 Cl3 violet and Cr H O 5Cl Cl H O grayish green 1 Linkage isomerism 2 Solvate isomerism 3 Ionization isomerism 4 Co ordination isomerism

i think this faculty is incorrect plz tell me what is the cor rect answer as i have studied that it is more in H2O2 then H2O ymogen 1 Hydrogen Which of following is incorrect for order H O H O 1 Boiling point 2 Reactivity 3 Dipole moment x 4 H bond strength 13 M 11

2s subshell is greater in size than 1s subshell Similarly 2p 3p 4p subshells have similar shapes but their sizes increase in the order 2 p 3p 4p Orbital angular momentum of an electron is calculated using the expression 1 1 I I 1 h 2 h 2 here The magnitude of magnetic momentu may be given as L 1 1 1 BM where BM Bohr Magneton eh 4 m 1 BM 9 2732 10 4 J Maximum electrons present in a subshell 2 21 1 s subshell 2 electrons p subshell 6 electrons g subshell 18 electrons d subshell 10 electrons f subshell 14 electrons 3 Magnetic Quantum Number

One mole of N gas at 0 8 atm takes 38 seconds to diffuse through a pin hole where as one mole of an unknown compound of xenon with fluorine at twice the pressure of N takes 55 seconds to diffuse through the same pin hole How many lone pairs are around xenon in xenon fluoride compound Given atomic masses Xe 121 u F 19 u

Of the following species which has the highest bond order and shortest bond length NQ NO NO2 NO 1 NO only 2 Bond order of NO is highest and bond length of NO2 is shortest 3 NO only 4 NO2 only 2 12

One of the resonating structure of SO is 4 452 0 Which set of formal charge on oxygen and bond order is correct 1 0 5 and 1 5 2 1 5 and 3 3 2 and 3 4 4 16x6 5 4 1 5 and 1 5

10 Which of the oxides behaves as metallic or properties depending on insulating temperature 1 SiO 3 TiO 2 TiO3 4 ReO3 17 Which conducta 1 5M K 3 0 05M 18 Unit for

Which of the following statements is false 1 o bond is shorter than that of bond 2 Bond energies of o and bonds are of the order of 264 and 347 kJ mol respectively Free rotation of atoms about o bond is allowed but not in case of bond T 4 bond results from lateral overlap of atomic orbitals

Boron phosphide BP is a semiconductor and a hard abrasion resistance material It crystallises in a zinc blende structure formed from boron atoms in a fcc lattice and phosphorus atoms in tetrahedral holes Thus P atoms must be in 1 of the tetrahedral holes 1 2 of the octahedral holes 8 3 4 Equal to tetrahedral holes of the tetrahedral holes

The compound nickel II acetate is a strong electrolyte Write the reaction when solid nickel II acetate is put into water

Chem Section A This section contains 20 SINGLE CORRECT TYPE questions Each question has 4 choices 1 2 3 Read More Consider the leaching of Ag and Au and the metal is obtained later by displacement reaction using Zn Find out the correct statement In case of Ag a complex of coordination number equal to 4 is obtained Au forms a complex of coordination number 4 during leaching Zn forms a complex of coordination number 2 during leaching NaCN can be used in aqueous medium for the leaching of Ag and Au

em No 37 The LS configurations of the ground state of 2Mg Al 17C1 and 18 Ar are 13 respectively 351 1 S 2P1 2 2P 2 and So 3511 2P3 21 2P3 2 and S 2 2P3 2 and So 2P 1 21 50 3 2P1 2 and S 4 So 2P3 2 Note Give the total solution to find the answer

CAREER INSTITUTE KOTA RAJASTHAN In BF3 the B F bond length is 1 30 when BF3 is allowed to be treated with Me N it forms an add Me N BF3 The bond length of B F in the adduct is 1 Greater than 1 30 4 None of these 2 Smaller than 1 30 3 Equal to 1 30

Chem Section B This section contains 15 SINGLE CORRECT TYPE questions Out of these 15 questions candidate Consider the following reaction XeF2 PF5 The product obtained is XeF4 PF3 XeF5 PF Read More XeF3 PF4

During the balancing of the following reaction Au KCN H O O2 KAu CN KOH If the stoichiometric coefficient of Au is maintained as 1 than the sum of the stoichiometric coefficients of all the species present is 1 8 75 2 11 25 3 10 4 12 65

ce energy Which condition favours the bond formation where Fa force of attraction and Fr fc repulsion a Maximum potential energy and Fa Fr c Minimum potential energy and Fa Fr b Minimum potential energy and Fa d None of the above

At 298 K for the gas phase reaction 2SO g O g 2SO3 g 1 Kp 4 x 1024 atm If SO2 g pressures O2 g and SO3 g at partia of 2 1 and 2 atm respectively are mixed and allowed to attain equilibrium the approximate partial pressure of SO g at equilibrium is A 10 8 C 2 10 12 B 2 x 10 8 D 10 2

One litre of gaseous mixture of CH4 and H2 effuses in 200 seconds while one litre of gas X take 10 minutes to effuse in identical conditions If molar ratio of CH4 H2 in mixture is 1 2 Find molar mass c gas X in g mol 1 units