Chemical Bonding Questions and Answers

3 A solution containing 2 675 g of CoCl2 6NH3 molar mass 267 5 g mol is passed through a cation exchanger The chloride ions obtained in solution were treated with excess of AgNO3 to give 4 78 g of AgCl molar mass 143 5 g mol The formula of the complex is atomic mass of Ag 108 u 1 Co NH3 6 C13 3 CoCl NH3 3 2 CoCl NH3 4 CI 4 COCI NH3 Cl2

0201 stion No 15 40 The intrinsic viscosity of a water soluble protein at 25 C is fo 180 cm g The concentration of the solution of this protein in water at it will have a relative viscosity of 1 5 will be AO 0 2 78 10 g cm 3 BO 1x10 g cm 3 S CO1 78x10 g cm3 1 23 10 g cm3 269 90 020064696 2026 064696 20200646 9697900202 969

0 1 g of each of compound A and B both A and B are non dissociative and non volatile but at the boiling point A dissociates into 2C 40 degree of dissociation and B dissociates into 2D 60 dissociation solute dissolved in 100 g of solvent The increase in boiling point is found to be 0 11 K and depression in freezing point is found to be 0 3 C If Kf and Kb of the given solvent is 2 K molal and 0 5 K molal respectively identify the correct statement s Molar mass of B Molar mass of A Molar mass of B Molar mass of A 2 3 Relative lowering in vapour pressure at the boiling point is 0 35 if molar mass of solvent is 20 g mol and 10 g of each A and B is taken in 100 g solution Relative lowering in vapour pressure at the boiling point is 0 35 if molar mass of solvent is 30 g mol and 10 g of each A and B is taken in 100 g

50 A substance was known by its mode of synthesis to contain 10 atoms of carbon per molecule along with unknown number of atoms of chlorine hydrogen and oxygen Analysis showed 60 5 carbon 5 55 hydrogen 16 10 j oxygen and 17 9 chlorine The Empirical formula of the compound is 1 C 0H OCl 3 C10H10OCI 2 C 0H 1O Cl 4 C 0H 2O Cl

Which of the following intermolecular forces are not responsible for liquid state of Bromine at room temperature Dipole dipole forces Clear Resp London dispersion forces Hydrogen bonds

a Which formula of noble gas species is isoelectronic with IBr2 b Halogens have maximum negative electron gain enthalpy in the respective periods the periodic table Why c Sulphur hexafluoride is used as a gaseous electrical insulator Explain d SF6 is known but SnCl4 is not known Explain e Molecular nitrogen N is not particularly reactive Explain

On heating white colored powder stron gly in a boiling tube copper oxide black oxygen gas and a brown gas X is evolved a Identify the brown gas X evolved b Write balanced chemical equation o f the reaction c Identify the type of reaction

One mole of a real gas is subjected to a isobaric process from 2 bar 30 L 300K to 2 bar 40 L 500 K The molar heat capacity of gas at constant volume and constant pressure are 25 J K mol and 40 J K mol respectively What is the change in internal energy of the gas in kJ in this process

Two gases A B are mixed under constant temperature condition Initial volume of gas A is 2 litre that of gas B is 5 litre When stop cock is opened then which of the following statements is are correct initials moles of gas A 2 gas B 5 2 litre Gas A 5 litre Gas B ASmix In 3 3 x ASmix 0 if gas A B are same and equal volumes of them are mixed OASmix n n R In2 if equal volumes of same gases are mixed AS max is maximum when equal moles of two gases are mixed Gas A B are different D

54 82 litres of carbon dioxide are produced at a pressure of 154 atm by the action of acid on a metal carbonate The work done by the gas in calories in pushing back the atmosphere is R 0 082 litre atm deg mot 1 1000 3 1640 4 2000 4 137 7 kJ 1 atm 82 andrests the rahat at the groe av befi i R 0 082 litre atm deg mot 1 1000 2 820 3 1640 4 2000 3 45 9 k

90 Which statement in correct O All minerals are ores Mark for Review O A mineral cannot be an ore An ore cannot be a mineral O All ores are minerals

Which among the following is froth stabiliser in froth floatation process Xanthates Aniline NaCN Pine oil

In XeF5 molecule the lone pair electrons of Xe occupies axial positions Inter molecular Hydrogen bonds are observed in the following The dipole moment of CH CI is greater than According to VBT bond angle in H O CH3F molecule is 90 C H OH HF CH NH

In the 5th question option D is given to be incorrect Pls tell it s correct version Thank you very much 5 According to kinetic theory of gases A Collisions are always elastic B Heavier molecules transfer more momentum to the wall of the container C Only a small number of molecules have very high velocity D Between collisions the molecules move in straight lines with constant velocities IIT JEE 201

The compounds XeF2 XeF4 and XeF6 are white solids that can be sublimed at room temperature The lower fluorides react with fluorine on heating under pressure making higher fluorides The fluorides are very strong oxidising and fluorinating agents They react quantitatively with hydrogen Read Less X 3 H O Y 6 HF X H O Z 2 HF If X is xenon hexafluoride then correct statement s is are Compound Y is XeO3 which is an explosive solid Both compounds Y and Z have same number of lone pair s on central atom Z is a partially hydrolyzed product of compound X X act as fluoride donor when it reacts with alkali metal flouride

Which of the following is correct A In X ray photoelectron spectroscopy valence electrons are ejected B K E of photoelectrons increase when the intensity of the incident X rays is increased C K E of photoelectrons decrease when the oxidation state of the surface is increased D Number of photoelectrons emitted increases with frequency of the incident X rays

Moles of solute Molarity 120 60 moles of solute volume L of solution 2 05 mol L 2 mol 2 The mass of potassium dichromate crystals required to oxidise 750 cm of 06 M Mohr s salt solution is molar mass 392 a 0 49 g b 0 45 g c 22 05 g d 2 2 g Exp c Mohr s salt is FeSO NH SO 6H O Only oxidisable part Fe is Fe Fe e x6 00 14H 6e20 7H0 6Fe 0 0 14H Millimoles of Fe 750x0 6 450 Moles of Fe 450 1000 6 mol Fe 1 mol Cro 0450 mol Fe a 5 55x 10 M c 3 33x 10 M Exp a Molality 0 450 6 0 075 x 294 g 22 05 g 3 The molality of a urea solution in which 0 0100 g of urea NH CO is added to 0 3000 dm of water at STP is AIEEE 2011 W Molality Moles of urea 2 mol 0 974 L 300 ml x 6Fe 2Cr 7H O 0 0100 60 x 0 2999 0 450 mol moles of the solute mass of the solvent in kg 0 0100 g 19 mL AIEEE 2011 b 33 3M d 0 555 M 60 g mol Mass of 1000 mL of solution volume x density 0 075 mol Cr O 300 g Mass of solvent 300g 0 0100 g 299 9g 0 2999 kg t 1 dm 1000 mL 555 x 10 mol kg 4 Amount of oxalic acid present in a solution can be determined by its titration with KMnO solution in the presence of H SO The titration gives unsatisfactory result when carried out in the presence a gets oxidised by oxalic b furnishes H ions in addition to those from oxalic acid c reduces permanganate to Mn d oxidises oxalic acid to carbon dioxide and water Exp c Titration of oxalic acid by KMnO in the presence of HCI gives unsatisfactory result because HCI is a better reducing agent than oxalic acid and HCI reduces preferably MnO to Mn 45 In the reaction 2Al s 6HCl aq 2Al aq 6CI aq 3H g AIEEE 2007 a 6L HCl aq is consumed for every 3L H g produced b 33 6 LH g is produced regardless of temperature and pressure for every mole Al that reacts c 67 2 LH g at STP is produced for every mole Al that reacts d 11 2 LH g at STP is produced for every mole HCI aq consumed Exp d 2Al s 6HCl aq 2A aq 6C aq 3H g From the equation it is clear that 6 mol of HCI produces 3 mol of H 3 x 22 4 6 or 1 mole of HCI Lot H 11 2 L of H How many moles of magnesium phosphate Mg PO will contain 0 25 mole of oxygen atoms AIEEE 2006 a 0 02 c 1 25x 102 b 3 125 x 10 d 2 5x 10 Exp b 8 moles of O atom are contained by 1 mole Mg3 PO4 2 Hence 0 25 moles of O atom are contained by x 0 25 mol Mg PO4 3 125 x 10 8 47 If we consider that 1 6 in place of 1 12 mass of carbon atom is taken to be the relative atomic mass unit the mass of one mole of a substance will AIEEE 2005 a be a function of the molecular mass of the substance b remain unchanged c increase two fold d decrease twice Exp b The mass of one mole of a substance will remain unchanged

6 Which one is a wrong statement 1 Total orbital angular momentum of electron in s orbital is equal to zero 2 An orbital is designated by three quantum numbers while an electron in an atom is designated by four quantum numbers 3 The electronic configuration of N atom is 2s 2p 2p 2p 1 1s y

3 HNO 3HCl H Co 07 CM NO 3 Cill 4H 0 net carite the rate expression for this reaction 1 Calculate the value of kr giver HNO Reaction Reaction 0 8 1 C 07 Rote 0 0018 0 4 0 7 Reaction 0 4 Reaction 0 4 0 9 org 0 9 id 017 1 4 0 7 010144 0 0036 0 0018

Which of the following statement is true 1 Silicon exhibits maximum 4 coordination number in its compound 2 Bond energy of F is less than Cl 3 Mn III oxidation state is more stable than Mn II in aqueous state 4 Elements of 15th group shows only 3 and 5 oxidation states

Among the following mixtures dipole dipole as th major interaction is present in 1 Benzene and CCI 4 2 Benzene and C H5OH 3 CH3COCH3 and CH CN 4 KCI and water

26 331 NH C Br aq NaNO Cu A A D NaNO HCI 0 5 C BHBF4 1 2 4 6 tribromofluorobenzene 2 2 4 6 tribromonitrobenzene 3 P bromofluorobenzene 4 P hromonitrobenzene

Decreasing order of bond length of given molecules C O N O C C C N is Options C C N 0 C 0 C N C C C O N 0 C N C N C C N O C O C C C N N O C O ped

Compare heat of hydrogenation of the following 00 1 1 2 3 4 Correct Answer 2 ii i ii iii iii ii i ii i iii ii iii i 1

Which of the following statements about hydrogen bonds is true Select ALL that apply Hydrogen bonds can occur between water molecules Hydrogen bonds occur between hydrogen atoms bound to an electronegative atom and another electronegative atom Hydrogen bonds are one of the strongest types of chemical bonds Hydrogen bonds can occur between macromolecules like proteins Hydrogen bonds are type of non polar covalent bond

The oxidation state of O in H O H O2 and KO2 respectivel are 2 1 1 2 2 2 2 1 1 1 2 1 2 12 2 1 1

from the given data select correct statements A at 27 degree C C can act as reducing agent for BO B at 27 degree C C can act as reducing agent for AO C at 27 degree C A can act as reducing agent for BO D at 27 degree C A can act as reducing agent for AO PLZ PROVIDE WITH STEP BY STEP SOLUTION ALTER In metallurgy concentrated oxide ores arverted into metal with the help of suitable reducing agent Data is given below for some reactions Reactions 1 2A s O g 2AO g II 2B s O2 g 2BO g III 2C s O g 2CO g Reaction 1 AHO kJ mol AS J mol K 100 11 70 60 280 210 160

Each NH3 molecule has six other NH3 molecules as nearest neighbors in solid state AH Of sublimation of solid NH3 at its m p is 30 8 kJ mol and in the absence of H bonding estimate A of sublimation is 14 4 kJ mol The strength of H bond in solid NH3 is A 5 47 kJ mol B 10 93 kJ mol C 16 40 kJ mol D 16 40 kJ mol 1

Which of the following is the correct curve for an orbital having set of quantum numbers n 1 m as 2 1 0 respectively showing variation in wave function radial component with respect to distance from the nucleus

9 Which of the following statements is not correct for a nucleophile a Ammonia is a nucleophile b Nucleophiles attack low electron density sites c Nucleophiles are not electron seeking d Nucleophile is a Lewis acid

In spite of being an odd electron molecule ClO2 does not dimerise because a the odd electron is delocalised b the odd electron is localised on the chlorine atom c the two Cl O bonds do not have the same length d of px Px bonding in the chlorine atom

In s p overlapping wrong statement is 1 Nodal plane formed in ABMO 2 Some orbital may have higher energy than combining orbitals 3 Combining orbitals should have same symmetry 4 Nodal plane is found in BMO

Choose the correct statement 1 dyz orbital lies in the xz plane II p orbital lies along x axis III Lobes of px orbital are at 90 with z axis IV Lobes of dxy orbital are at 90 with z axis Choose only 1 answer A III IV B II III C 1 11

The correct order of E values with negative sign M IM for the four successive elements Cr Mn Fe and Co is a Cr Mn Fe Co b Mn Cr Fe Co c Cr Fe Mn Co d Fe Mn Cr Co the decomposition of Al2O

Match the Xenon compounds in Column I with its structure in Column II and assign the correct code NEET 2019 Column l a XeF b XeF c XeOF d XeO3 Code a Column II i Pyramidal ii Square planar iii Distorted octahedral iv Square pyramidal b c b d iii iv iii iv i iii i iv iv i ii 1 i ii 2 ii 3 ii 4 iii

The cell potential for the voltaic cell depicted below is 0 109V under standard condition 2 2 Pb s Pbq Niaq Ni s aq Which change will decrease the voltage A The 1 M Ni2 solution is diluted with water B A larger Ni electrode is used C Cl ions is added to precipitate PbCl s D2M Pb2 solution is added to lead half cell tom ia

A reaction rate increases by a factor of 500 due to the presence of a catalyst at 37 C If the reaction is carried out in presence of a catalyst at 127 C by what factor compared to original rate in absence of catalyst at 27 C the rate will increase Activation energy of origina pathway is 106 kJ mol A 5 05 10 6 C 5 05 B 5 05 106 D 106

CH CHO g undergoes decomposition at very high temperature according to first order parallel reactions CH CHO 9 CH g CO g CH CHO 9 CH CO g H g The mol of CH4 in the reaction mixture excluding CH3CHO would be 100k k K A C 50k k K 150k k K B D 200k k K bic Gold leaf

A TEM AT FIRST R The n 1 values for 5s orbital and 4p orbital are identical Rp hech f n 151 A Complex Co en NO CI can exhibit linkage 151 A Co en NO CI CLICCA varia cad N20 2 R Ethylene diamine en uch fach fatius i isomerism R Ethylene diamine en is bidentate ligand Ste G HR

When heat is absorbed then solution of enthalpy is positive then bond will not dissociated and when heat is released then negative so bond will dissociated Am I right solution of enthalpy is 5 56 AM

Potassium sorbate C6H KO is an additive used to prevent molding of cheese Its conjugate acid monoprotic has Ka 1 74x10 5 Find the pH of an aqueous solution containing 2 55 g of potassium sorbate in 500 0 mL Select one a 10 65 b 8 65 c 3 11 X d 4 76 e 2 55

to combine is If all the oxygen atoms from a mixture of 2 moles H P O 54 gms H O and 98 gms H SO4 are taken and converted into Ozone the the number of moles of Ozone gas formed will be

Identify the incorrect statement Both LiCl and MgCl2 are soluble in ethanol Li is the strongest reducing agent among all the alkali metals LiCl crystallises as LICI H O Lithium nitrate when heated gives lithium oxide

Two aqueous solution of glucose having osmotic pressure 3 atm and 1 5 atm at 300K are mixed in volume ratio 1 2 to form a final solution Calculate elevation in BP of this solution at 300K Given K for H O is 1 8 K kg mol Assume m M Give answer as 20 x AT Use R 0 08 atm litre mol K

c 275 1 pm d 322 5 pm 17 AB crystallises in a body centred cubic lattice with edge length a equal to 387 pm The distance between two oppositely charged ions in the lattice is 2010 Pre a 335 pm c 200 pm b 250 pm d 300 pm d 6 0 c 6 02 x 10 4 mol 25 The fraction of total volume o present in a simple cube is b a T 3 2 4 2 C 26 The appearance of colour halides is generally due to

The wave function for a hydrogen atom with its electron in the 2p state varies with direction as well as distance from the nucleus What is the probability of a 2p electron for which m 0 existing on the xy plane a 0 b 1 d Ao c 200

If a cylinder of automobile engine has volume 821 cm and cylinder is full of air at atmospheric pressure 1 atm air having mole fraction of O 0 2 at 127 C then how much of C H g can undergo combustion by this amount of air 8 18 A 4x 104 mol B 4 x 10 mol C 8 x 10 mol D 2 x 10 4 mol

How many of the following are ores of iron Haematite Limonite Magnetite Siderite Iron Pyrites Beryl Rutile Quartz Write the sum of geometrical isomer in Ma b c complex and stereoisomers in M AB complex

48 180 Mark for Review In which of the following reactions the underlined element is reduced O MnO KOH O K MnO 2H O 02 45 hr min O C 0 MnO4 H Mn CO H O O cro H Cr O H O Na SO3 Cl H O Na SO4 2HCI

1 Which of the following hydrocarbon can give only acetone 21 fhio foigh and Butterfa sisiti cuz and CO on ozonolysis in presence of Zinc 1 CH3 CH C CH CH3 2 CH3 CH CH CH C CH3 2 3 CH3 C C CH2 4 CH C C C CH 9 0 9 CH CH S 4 17 3 co 1 CH3 CH C CHCH3e 2 CH3 CH CH CH C CH3 3 CH3 C C CH 4 CH CHIC HC CH CH CH HCM cy