Chemical Bonding Questions and Answers

The first IE and second IE ionization enthalpies KJ mol 3 elements A B and C are given below A B C IE 403 549 1142 Identify the element which is likely to be i A non metal IE2 2640 1060 2080 ii An alkali metal iii An alkaline earth metal

An ideal gaseous sample at initial state i Po Vo T is allowed to expand to volume 2V using two different process in the first process the equation of process is PV K and in second process the equation of the process is PV K Then A Work done in first process will be greater than work in second process magnitude wise B The order of values of work done can not be compared unless we know the value of K and K C Value of work done magnitude in second process is greater in above expansion irrespective of the value of K and K D 1st process is not possible

20 The incorrect statement is a the spin only magnetic moments of Fe H O and Cr H O 612 are nearly similar the gemstone ruby has Cr ions occupying the octahedral sites of beryl the color of CoCl NH3 2 is violet as it absorbs the yellow light desitida bisa d the Jang si moment spin only Ni NH3 4 H O JOT magnetic is 2 83 B M 11 of gives a

Amongst NO ASO CO CIO SO and BO the non planar species are 1 CO SO and BO 2 AsO CIO and SO 3 NO CO and BO 4 SO NO and BO Which of the following is a hypnotic drug 3

With respect to hypochlorite chlorate and perchlorate ions choose the correct statement s a The hypochlorite ion is the strongest conjugate base b The molecular shape of only chlorate ion is influenced by the lone pair of electrons of CI c The hypochlorite and chlorate ions disproportionate to give rise to an identical set of ions d The hypochlorite ion oxidizes the sulfite

Match the geometry given in column A with the complexes given in column B in Geometry A Complex B 1 Octahedral II Square planar III Tetrahedral 1 I P II Q III R 3 1 R II Q III P P Ni CN Q Ni CO R Fe CN 2 I R II P III Q 4 I Q II P III R IDE

29 Find out value of expression x y for complex compound Zn bcac x Total number of O Zn O bond angle s in the compound where 3 y Total number of sp Hybridized atom s in the compound

Which of the following structures is correctly drawn according to fundamental idea of VSEPR theory a b c d H FOF F F CL 0 greater than 109 28 F Cl Cl S e Si Cl 0 less than 90 F 0 90 F 0 90

4 H Se because of lower molecular weight Among KO AIO BaO and NO unpaired electron is present in 1 NO BaO 2 KO and AIO 3 KO only 4 BaO only An organic molecule necessarily shows optical activity if it

If a solute X undergoes dimerisation and solute Y undergoes trimerisation the minimum values of the van t Hoff factor for X and Y will be respectively 0 33 and 0 5 1 33 and 1 5 0 5 and 0 33 0 2 and 0 67

Among the following pairs of species in which first species has lower ionisation energy and higher electron affinity than second species 1 N and O 11 O and S 11 Be and B v Li and Lit iv Cl and Cl vi F and Cl

b Textile substrate is dyed using three colours Write down the formula for K M function for this dyed sample Explain each term c Name triadic colour arrangements which can be used to generate colour schemes

A 20 gm mixture of isobutane and isobutene requires 40 gm of Br in CCl4 for complete addition this mixture is catalytically hydrogenated and the entire alkane is monobrominated in the presence o light at 127 C how much of product is produced At Wt of bromine 80

83 1 XYZ 2 X YZ 3 X YaZs 4 XsY4Z8 Identify the option which represents the correct products of the following reaction OF PHCHO CH CHO Aldols PH CH CH CHO I III OH DLH OH CH CH CH CHO 2 L III II PhCH COPh IV OH O 11 CH CH C Ph 3 II III 4 L III IV

Two liquids A and B form an ideal solution The solution has a vapor pressure of 700 torr at 80 C It is distilled till 2 3rd of the solution is collected as condensate The composition of the condensate is x A 0 75 and that of the residue is x 0 30 If the vapor pressure of the residue at 80 C is 600 Torr which of the following is are true A The composition of the original liquid was x 0 6 B The composition of the original liquid was x 2500 C PO 3 D P 500 Torr Torr 0 4

Ex 31 An organic compound A contains 40 carbon 6 7 hydrogen and rest oxygen Its vapour density is 15 On reacting with a concentrated solution of KOH it gives two compounds B and C When B is oxidised the original compound A is obtained When C is treated with concentrated HCl it gives a compound D which reduces Fehling s solution as well as ammoniacal AgNO3 solution and also gives effervescence with NaHCO3 solution Write the structures of A B C and D

Consider the following statements a NO is an odd electron molecule b 03 molecule has two resonating structures c PF5 follows octet rule The correct statements is are O a and b only Ob and c only O a and c only a b and c

In which of the following pairs hydrogen bond is present O He and Cl O HCI and H O NH3 and H O O H O and H

C C CH C C CH OH 3 4 OH Which of the following chemical equation represents the formation of colloidal solution 1 Cu CuCl CuCl 2 2Mg CO 2MgO C 3 2HNO 3H S 3S 4H O 2NO 4 Both 2 3

31 Two samples X and Y contain equal amount of radioactive substances If of the sample X and 1th of the sample Y remain after 8 hours then 16 256 the ratio of half life periods of X and Y is a 2 1 b 1 2 c 1 4 d 4 1 32 The decay constant 41

16 2 gram moles of H and 5 88 gram moles of 12 are heated at 444 C At equilibrium 11 28 gram moles of HI are formed Calculated the equilibrium constant K for the reaction H g 12 g 2HI g Ans 50 2

Compound P forms a precipitate with AgNO The precipitate dissolves in excess reagent P P cannot be 1 KOH 2 KCN 3 Na S O 4 NH Addition of sodium hydroxide solution to a weak acid HA results in a buffer of pH 6 If ionization

Consider the reaction Cl2 aq H S aq S s 2H aq 2Cl aq The rate equation for this reaction is rate K Cl H S which of these mechanism is consistent with this rate equation 1 Cl H S H CI CI HS slow CI HS H CI S fast II H S H HS fast equilibrium Cl HS 2CI H S slow Question Type Single Correct Type 1 2 I only II only

For the given real gas reaction 2A g B g D g carried out in 10 litre rigid vessel the initial pressure is 50 bar which decreases to 20 bar in the course of reaction If heat liberated in the reaction is 400 kJ then what is change in magnitude of internal energy of the reaction in KJ Fill your answer as sum of digits excluding decimal places till you get the single digit answer

9 At 88 C benzene has a vapour pressure of 900 torr and toluene has a vapour pressure of 360 torr What is the mole fraction of benzene in the mixture with toluene tha will boil at 88 C at 1 atm pressure benzene toluene for an ideal solution a 0 416 c 0 688 b 0 588 d 0 740

1 1 1 1 2 1 2 1 3 1 2 3 4 2 2 3 3 From a measurement of the freezing point depression of benzene the molecular weight of acetic acid in a benzene solution was determined to be 100 The percentage association of acetic acid is 1 79 2 93 3 80 An aqueous solution containing an 4 100 ionic salt having

sertion When a mL of a 0 1 molal urea solution is mixed with another b mL of 0 1 molal glucose solution the boiling point of the solution is no different from the boiling points of the samples prior to mixing but if a mL of 0 1 molal urea is mixed with b mL of 0 1 molal HF the boiling point of the mixture is different from the boiling points of the separate samples eason HF is an electrolyte weak whereas glucose is a non electrolyte 1 If both the assertion and the reason are true and the reason is a correct explanation of the assertion 2 If both the assertion and reason are true but the reason is not a correct explanation of the assertion 3 If the assertion is true but the reason is false 4 If both the assertion and reason are false 675

In the parallel reaction A 4B 5C if at any time B C 1 and half life period for the formation of B is 5 400 minutes and half life period for the formation of C in nearest possible integers is 5X minutes then X is

27 a Be and Mg are alkaline earth metal b K have larger radii than Ca c All d block elements are transition elements d He ion have larger size than F Znis Incorrect statements is are 1 a c d 3 a d 2 b c 4 a c

The reaction 2A B C D goes to completion and follows the rate law d B dt K A B Calculate the values of x y in the following data Set A x 10 3 M Bo 10 M 1 300 2 300 3 5 10 A 375 C 385 4 16 300 300 Half life sec 62 5 625 B 380 D 390

The vapour pressure of a 5 aqueous solution of a non volatile organic substance at 373 K is 745 mm Calculate the molecular mass of the solute

During the titration of 20mL of x M NaOH using standard solution of HC1 of molarity 0 1M the pink colour of phenolphthalein changes to colourless on the addition of 19 8mL HCl solution Then the value of x is 1 0 1 2 0 098 3 0 099 4 0 001

Schottky defect is shown by A strongly ionic compounds B C D compounds having high coordination number compounds containing cations and anions of almost similar size all of these Jhap

Which of the following statements regarding Nitrogen pentoxide is not correct 1 Nitrogen pentoxide is a colourless deliquescent liquid 2 Nitrogen pentoxide is the anhydride of nitric acid 3 Solid N O is a covalent molecule 4 The molecule of N O in planar

The number of species below that have two lone pairs of electrons in their central atom is Round off to the Nearest Integer SF BF4 CIF ASF PC15 BrF5 XeF SF6 4 en 2

1 7 Ethyl 2 4 5 6 tetramethyldeca 1 8 diene 2 4 Ethyl 5 6 7 9 tetramethyldeca 2 9 diene 3 2 4 5 6 tetramethyl 7 ethyldeca 1 7 diene 4 None of these Which of the following sulphates has the highest solubility 1 BESO 2 MgSO 3 BaSO 4

0 The atomic radii of transition elements from Cr to Cu are almost equal because 1 Increased effective nuclear charge is balanced by decreased screening effect of electrons in n 1 d orbitals 2 Increased effective nuclear charge is balanced by increased screening effect of n 1 d orbitals 3 Decreased effective nuclear charge is balanced by increased screening effect of electrons in n 1 d orbitals 4 None of these Benzene diazonium chloride on boiling with dilute sulphuric acid gives

liberated The gas is 1 CL 3 N 4 H C H O is a carbonyl compound The number of structural isomers possible for this molecula formula are 2 NH 1 5 2 8 3 6 4 7 In the reaction 44 2B 3C A B C what will be the number moles of product formed

5 solution 1 2 2 1 3 13 4 12 The correct order of increasing thermal stability of the given compounds is 1 HF II HBr III HC IV HI 1 I II III IV 2 IV II III 1 4 II IV 1 III 3 IV II I III Br

Using graph concentration of reactants and products as a function of time for the reaction A33A The time t corresponds to 1 t conc 2 t A k 2 303 t time A e lo C

state This solid is most likely to be a an 1 Molecular solid 2 Ionic solid 3 Covalent solid 4 Metallic solid Question Type MCQ Question ID 864351561 Option 1 ID 864351168

Board Competitive Exams 44 Which one of the following ions has electronic configuration Ar 3d 1 Co 2 3 M 4 Fe At nos Mn 25 Fe 26 Co 27 Ni 28

The shape of XeO3 is a T shaped c Triangular planar d b Tetrahedral d Pyramidal

49 Which of the following is most polar a b c non utemara d

1 CH 2 C H If Fe CO the Fe C bond possesses 1 character only 2 Ionic character characters Which is used in the formation of nylon 6 6 1 Sulphurhexa fluoride 3 CO 3 character only 2 Adipic acid 4 Xe 4 Both o anc AAJ KA TOPPER

An element E belongs to modern periodic table with atomic number Z If E 2 has highest energy electron in a subshell for which number of total node are half of orbit number The orbital angular momentum of highest energy electron in E is Assume E has the minimum atomic number that follow above condition but Z 6 Zero 2 h 2T 6 h 2T 12 h

When acetylene is passed through 2 points a solution of copper chloride a red precipitate of copper acetylide Cu2C2 is formed Determine the bond order of C2 2 and identify the HOMO and LUMO orbitals Compare the same with C2

S and Pauli s principles d None of these 119 A compound of vanadium has a magnetic moment u of 1 73 BM If the vanadium ion in compound is present as V then the value of x is a 1 b 2 c 3 120 d6 configuration will result in total spin of d 4

Assertion Nitrogen and oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen JEE Main 2015 Reason The reaction between nitrogen and oxygen requires high temperature A Both the assertion and reason are incorrect B Both assertion and reason are correct and the reason is the correct explanation for the assertion C Both assertion and reason are correct but the reason is not the correct explanation for the assertion D The assertion is incorrect but the reason is correct

9 Given electronic configurations of four elements E E E3 and E4 are respectively 1s 1s 2s 2p 1s 2s 2p5 and 1s 2s 2p6 The element which is capable of forming ionic as well as covalent bonds is 1 E 2 E 3 E 4 E4