Chemical Bonding Questions and Answers

temperature and catalyst intration of reactants pressure in case of gases the experimental conditions such The rate of a chemical reaction at a given temperature may depend on the concentration of one or more reactants and products The representation of rate of reaction in reactants is known as rate law It is also called as rate equation or rate expression ma of concentration of the The results in Table 4 1 clearly show that rate of a reaction decreases with the passage of time as the concentration of reactants decrease Conversely rates generally increase when reactant concentrations increase So rate of a reaction depends upon the concentration of reactants

4 a c 1 a b 66 The correct order of the O O bond length in O H O and 66 O H O 0 0 14 15 16 3 c d HO 27 D 2 O is 1 0 H O O 2 0 H O O X 3 0 0 H O X 4 H O 0 0 Rond 180 1 03 H O 0 2 0 H O 03 3 0 03 H O 4 H O O 0 E 2 b c 4 a c

79 For NaCl crystal the sublimation Energy of Nais 108 5 KJ 79 NaCl 3 13 TAH Chemical Bondin 11 Bond dissociation energy of Cl is 243 KJ lonization energy 2 of Na is 495 2 KJ and electron affinity of Cl is 348 3 KJ and lattice energy of NaCl crystal is 758 7 KJ Calculate the value of AH for NaCl Cl 1 281 8 KJ mole 2 381 8 KJ mole 3 265 8 KJ mole 4 395 3 KJ mole nic Na 108 5 d Na 492 21 Na t 243 cl 384 3 CL N 243 K 348 3 KJ NaCl3 758 7 KJ 1 281 8 KJ mole 2 381 8 KJ mole 3 265 8 KJ mole 4 395 3 KJ mole 108 5 KJ Cl 495 2 KJ CScacia y 1187 0 74 3 7

Chemical Bonding 6 The correct sequence of increasing covalent character is 6 may c add 33 34 fuh Gri wila Gila represented by Brf3 1 LICI NaCl BeCl 2 BeCl LICI NaCl 3 NaCl LiCl BeCl BeCl NaCl LICI CHL 160 35019 1 LiCl NaCl BeCl 2 BeCl LICI NaCl 3 NaCl LICI BeCl 4 BeCl NaCl LICI F Brif C P L

59 The incorrect statement is 1 p have two nodal planes 2 Bond order of HeH is 0 5 3 In NCO C is sp hybridised 4 O is polar while O is non polar 2 Whi 0 A 4 0 Cl dz 69 1 p 2 HeH 0 51 3 NCO C sp 1 4 0 0

31 A solid AB has NaCl type of ideal crystal structure 3 with packing efficiency of 79 If all atoms along a body diagonal are removed Then new packing efficiency of solid would be 1 79 2 73 1 3 68 2 4 60 4

65 Dipole moment of CI 11 1 D 2 4 4 D 3 3 3 D 4 2 56 D is 1 1 D hence dipole mo 65 ment of given compound will be CI CI Ca CI 1 1 1 D 2 4 4 D 3 3 3 D 4 2 56 D CI CI 1 1 De fa fa g CI

81 If lattice energy of sodium chloride is U then lattice energy 8 man attraction of magnesium chloride is 1 2U 2 4 U 3 6 U 4 None Which 7 wal U ngch

Among the following the correct statement s is are A AI CH has the three centre two electron bonds in its dimeric structure B AICI has the three centre two electron bonds in its dimeric structure C BH has the three centre two electron bonds in its dimeric structure D The Lewis acidity of BC1 is greater than that of AICI

85 SCQ B Which of the following Lewis acid base interactions are associated with the further involvement of d orbitals A SbF5 HF H SbF6 C D en AlCl3 Cl AlCl4 NH3 BF3 NH3BF3 PH H PH D Correct Answer C

80 Ionic compound in which cation and anion are bonded by 80 minimum force of attraction mg img 1 Na N 2 Mg3N 3 Ca3N 4 BeO A ca Atsumot that Amie the compount have ttraction mana

4 Which is correct 1 Li CO Na CO Thermal Stability X 2 NaF KF Lattice energy 3 BaSO MgSO Solubility X 4 All of these aq Lit Ionic mobility aq 82 4 Be Lit aq aq 34 Tagical 1 LICO Na CO arta panifurca 2 NaF KF Ich hof 3 BaSO4 MgSO factual 4 3

2 The pair of elements which on combination are most likely 52 fa to form an ionic compound is 1 Na and Car 3 O and Cl 2 K and O 4 Al and I A 4 M PO4 3 1 Na Ca 3 CI 2 KO 4 Al I

On this transformation PC15 PCI What change will take place A Hybridisation of P will change B Regular geometry changes C Shape of molecule changes 3 All of these Correct Answer

2 CH AIF 3 SF CL OX 4 IF PCI5 f 50 The electronic structure of four elements a b c and d are 50 a 1s b 1s 2s 2p c 1s 2s 2p5 d 1s 2s 2p6 The tendency to form electrovalent bond is greatest in 1 a 2 b 3 C B B 1 B H AICI 2 CH AIF 3 3 SF CI O 4 IF PCI a b cada a 1s c 1s 2s 2p5 1 a 2 b 3 c FA b 1s 2s 2p d 1s 2s 2p af f na

Match the column for B2H6 Column l A Maximum atom in same plane B 3C 2e bonds C Maximum replacable H atoms D Boron atoms which follow octete rule A A S B P C Q D R Contect Answer B A R B Q C S D P Column II P 0 Q 2 R 6 S 4 C CA R B S C P D Q 3

In nitrogen atom three 2p electrons reside in different orbitals whereas in oxygen atom two of four 2p electrons must occupy the same 2p orbital resulting in increased repulsion therefore ionization enthalpy of N is greater than that of O

b Match the polymer of column I with correct monomer of colu Column I Column II i High density polythene ii Neoprene iii Natural rubber iv Teflon v Acrilan a Isoprene b Tetrafluoroethene c Chloroprene d Acrylonitrile e Ethene

A B D XeF2 CO32 Bond angle 2p o 1s Number of nodal plane Correct Answer N N N Order of bond length 02 02 Order of magnetic moment

In SCQ which of the following transformations the bond order has increased and the magnetic behaviour has changed A C C B NO NO en C C 02 0 Corect Answer

An electron starting from rest takes 14x10 9 sec to reach from one plate to other of a capacitor placed 2 cm apart If charge to mass ratio of electron is 1 8x1011 CI kg Then find the potential difference between the plates Ans V 2400 Volt

33 produces 1 CH CH CHCH 1 Br CH CHCH 3 Br 4 Treatment of cyclopentanone 1 2 C6H CH CH CH CH CH CHCH CH T Br A methyl lithium gives which of the following species 1 Cyclopentanonyl cation 2 Cyclopentanonyl radical 3 Cyclopentanonyl biradical 4 Cyclopentanonyl anion HB Re AIPMT 2015 5 In the reaction with HCl an alkene reacts in accordance with the Markovnikov s rule to give a product 1 chloro 1 methylcyclohexane The possible alkene is 2 CH HC0277 B 0 with CC0278

Find bond enthalpy of C 0 in kJ mol using following informations AHatomisation C s 700 kJ mol AHf CO g 400 kJ mol BEO 0 500 kJ mol kJ mol Resonance energy of CO2 150

A Compound of formula Rn Si OH 4 n form linear and cyclic silicon respectively the value of n may be B 1 2 2 2 C 1 3 4 en 31 B Correct Answer U

A molecular adduct is formed between BF and Et O Which of the following values desc coordination number CN valency V and oxidation state OS of B atom in this adduc A CN 4 V 4 and OS 3 B CN4 V 3 and OS 4 C CN 4 V 3 and OS 3 D CN 3 V 3 and OS 4

Select order of dissociation constant in aqueous solution at 298 K A B C D Wen H O H S H Se H Te Correct Answer H Te H Se H S H O H Te H Se H O H S H Te H S Hose HO

Which of the following order is correct A B Correct Answer Clo CIO CIO C1 0 bond order 3 CO32 CO CO2 C O bond strength 3 C PO4 SO4 Number of coordinate bonds 2

en C Which of the following statements is not correct regarding NO2 molecule 88 SCQ A Paramagnetic behaviour decreases when it undergoes in dimerisation B It is colourless in its dimeric form Correct Answer It can t follow octete rule in it s demeric form

en C Which of the following is not correct 73 SCQ A CH4CO2 order of EN of C atom B In Tl order of EN C NH3 PH3 ASH3 SbH3 lewis basic strength Correct Answer D NO Na20 Al2O3 acidic strength

1 The following equilibrium is established when HC1O4 is dissolved in weak acid HF HF HC104 CIO4 H F Which of the following is correct set of conjugate acid base pair 1 HF and HC104 3 HF and H F 2 HF and ClO 4 HC1O4 and H F

A gaseous mixture of three gases A B and C has a pressure of 10 atm The total number of moles of all the gases is 10 If the partial pressure of A and B are 3 0 and 1 0 atm respectively and if C has mol wt of 2 0 what is the weight of C in g present in the mixture

The following two reactions of HNO with Zn are given as equations are not balanced Zn conc HNOs Zn dil HNO3 Zn NO3 Y H O B In reactions A and B the compounds X and Y respectively are Zn NO3 X H O A ONO2 and NO O O O NO2 and NO2 NO and NO2 NO and N O

0 25 molal aqueous solution of a mono nuclear complex containing potassium cobalt d cyanide ion is prepared for cryoscopic experiment Freezing point of the above lution was found to be 1 86 c Magnetic moment measurement revealed that spin ly magnetic moment is zero vapour pressure of the same solution at 25 c if vapour essure of pure water at 25 cis 23 8 mm of Hg is mm

154 The correct order of bond angles smallest first 2010 10 in H S NH3 BF3 and SiH4 is A H S SiH4 NH3 BF3 B H S NH3 BF3 SiH4 C H NH3 SiH4 BF3 D NH3 H S SiH4 BF3 A 200 E

A thin ring of radius R has a charge Q non uniformly distributed on it The electrostatic potential at the center c the ring will be Zero Q 4 E R 2Q 4TE R Insufficient information

25 In forming C C and ii 0 the electrons respectively are removed from A 2pz or 2px and 2py or 2px B 2 y or 2px and 2py or 12px 2py C 12py or 12px and 2py or 2px D 2py or 2px and 2py or 2px D C E T 2009

An atom X has an electronic configuration 2 8 7 It combines with Y having 2electrons in its outermost shell 1 what type of bond will be formed between X and Y ii Show the formation of compound with owic dot diagra

Sodium and potassium react with water much more vigorously than lithium because a Sodium and potassium have high values of hydration energy as compared to that of lithium b Sodium and potassium have higher melting point than that of lithium c Sodium and potassium have lower melting point than that of lithium d Sodium and potassium have lower hydration energy than that of lithium hinbest reactivity towards

51 Identify the correct statement from below concerning the structure of CH C CH A The molecule is planar B One of the three carbon atoms is in an sp hybridized state C The molecule is non planar with the two CH groups being in planes perpendicular to each other D All the carbon atoms are sp hybridised E The molecule is bent with the C C C angle being 120 degrees

106 The lanthanide compound which is used as a most powerful liquid laser after dissolving in selenium oxychoride is 1 Cerium oxide 2 Neodymium oxide 3 Promethium sulphate 4 Cerium sulphate 107 11

87 Which of the following overlaps is incorrect assuming z 87 axis to be the internuclear axis 1 2 py 2 py 2 py Py T 2 2 P 2 P o 2p 3 2 Px 2 px 2 Px 4 1 s 2 py m 1 s 2 py 1 a b 2 b d 3 only d A N fth

For a particular reaction in a galvanic voltaic cell AS is negative Which of the following statements is true Os will increase with an increase in temperature Os will decrease with an increase in temperature Os will not change when the temperature increases AG 0 for all temperatures None of these statements is true

6 Consider the following information Atomic radius of Li Atomic radius of Be x Atomic radius of Na Atomic radius of Li y Atomic radius of K Atomic radius of Na Z then correct relation between x y and z 1 x y z 2 x y z 3 z x y

Which of electron affinity 1 3 Decrease Increase 2 Increase 4 decrease 0 0 CI CH O 0 Decrease Cle Increase decrease Decrease Increase decrease Increase S F S Decrease F Increase S Increase S Increase ws correct change in 8

5 The freezing point of an aqueous saturated solution of I is 0 0024 C More than this can dissolve in a KI solution because of the following equilibrium 12 aq aq 13 09 0 1 M KI solution dissolves 12 5 g L of I Calculate the equilibrium constant K for the above equilibrium Also calculate the freezing point of the resulting solution Assume molarity to be equal to molality and also assume that conc of L in all saturated solutions is same K for water 1 86 K kg mol

48 3 V II III I N COL 4 II IV III I II NH pyrrole 1 pyridine II aniline III which is are correct statements 1 I is more basic than II 2 II is more basic than I and III 3 III is more basic than II 4 All are correct IRANDOM TEST

Bond angle between two hybrid orbitals is 105 S character orbital is 1 between 30 31 2 between 19 20 3 between 25 26 4 between 22 23 113

During electrolysis of aqueous NaOH 4g of O gas is liberated at NTP at anode H gas liberated at cathode is CBSE PMT 1998 a 2 8 litres 112 litres b 5 6 litres d 22 4 litres

The ionization constant of NH in water is 5 6 10 10 at 25 C The rate constant for the reaction of NH and OH to form NH3 and H O is 3 4 x 10 0 lit mol sec at 25 C The rate constant for the proton transfer from water to NH3 in lit mol sec is 1 1 6 07 105 2 6 07 10 5 3 6 07 x 10 4 6 07 x 10 3

A buffer solution is made by mixing a weak acid HA K 106 with its salt NaA in equal amounts What should be the amount of acid or salt that should be added to make 90 ml of buffer solution of buffer capacity 0 1 1 10 milli moles 2 22 milli moles 3 9 milli moles 4 11 milli moles