General Questions and Answers

What is the formation reaction for MgSO4 s I MgNO3 aq H SO4 aq 2 HNO3 aq MgSO4 s II Mg 2 aq SO42 aq MgSO4 s III Mg s S rh 2O2 g MgSO4 s IV MgO s SO3 g MgSO4 s V None on the answers 22 49

Complete the sentences with the correct form of the verbs given in brackets I would have phoned you come cricket play the offer accept her she would have come invite 1 If he 2 If it hadn t rained we 3 If I were you I 4 If you 5 1 6 If I had lots of money I 7 If you had run you 8 Ifl 9 If we 0 I wouldn t do that if I Ifl If I knew her address I him if I had been free meet round the world travel the bus catch in America I would earn a lot of money live now we would get there by lunchtime start you be her she might have come phone

n be stant 4 0 1 M Ca NO3 2 and 0 1 M Na2SO4 121 What will be major product in following reaction CH CH 1 2 3 4 122 CH CH CH CH CH CH CI CI CH CH CI P hv

Metallic lustre is explained by 1 diffusion of metal ions 3 excitation of free protons In an antifluorite structure cations occupy 2 oscillation of loose electrons 4 existence of bcc lattice u F Nazo

Select correct dlagi dill about acidic strength of oxides P 06 1 Increase ALO P4 06 2 Decrease P 06 3 Increase Increase Increase AL2 034 Al2O3 P 06 Increase Decrease Decrease Increase SO 3 Decrease Cl 07 Decrease Increase SO3 Decrease Ch 2 07 SO3 Increase CO7 SO 3 Increase

The correct values of ionization energies in kJ mol of Be Ne He and N respectively are A 899 2080 1403 2372 B 2080 899 1403 2372 899 2080 2372 1403 D 899 1403 2080 2372 WFL 1 fal c 125

molar mass of the compound carbon tetrafluoride C below for calculating the F Molar mass of element g mol g mol X X Moles mol mol II 11 Molar mass carbon tetrafluoride Mass in one mole of carbon tetrafluoride 00 50 S

34 48 When air is replaced by a dielectric medium of constant K the maximum force of attraction between two charges separated by a distance

The ionic radii of Rb and I are 1 46 and 2 16 A The most probable type of structure exhibited by thi 1 CsCl type 4 CaF type NaCl type 3 ZnS type A solid AB has NaCl type structure If the radius of the cation A is 100 pm then the radius of the ani

For which one of the following is AH reaction equal to AH f for the product 1 2CO g O2 g 2CO2 g 2 3 4 orrect Answer 4 our Answer N2 g O3 g N2O3 g CH4 g 2Cl2 g CH Cl2 1 2HCI g Xe g 2F2 g XeF 4 s

1 An oxide of N has vapour density 46 Total number of electrons in its 92 g are a 48 N b 46 N c 92 N d none of these The de Broglie wavelength of a 66 kg man sking down

a 4 1 b 6 1 c 5 1 d 3 1 111 A 20 0 mL sample of a 0 20 M solution of the weak diprotic acid H A is titrated with 0 250 M NaOH The concentration of solution at the second equivalent point is a 0 10 M NaHA b 0 153 M Na A c 0 10 M Na A 12 During the titration of a weak diprotic acid H d 0 0769 M Na A 4 against a strong baso NOH the pll of the

40 Oxygen consists of 016 017 and 018 isotopes and carbon consists of isotopes of C12 and C 3 Total number of CO2 molecules possible are 6 c 18 Ca M w 0120 b 12 d 1 pour density 46 Total number of 2

Consider the balanced chemical reaction below How many grams of F are needed to produce 120 g of PF3 if the reaction has a 73 2 yield and assuming there are 1000 g of solid P4 available P4 s 6 F g 4 PF 3 g NEXT Based on your knowledge of stoichiometry set up the table below that represents 100 yield with the given reaction conditions Before mol Change mol After mol P4 S 2 6 F g 4 PF 3 g

109 If 1 g of each of the following gases are taken at ST then which of the gases will occupy the greatest volume CO H O CH NO 1 CH4 2 H O 3 NO 4 CO

is are correct 8 1 The pH of 1 0 10 M solution of HCI is 8 2 The conjugate base of is 3 Autoprotolysis constant of water increases with temperature 4 When a solution of a weak monoprotic acid is titrated against a strong base at half neutralization point pH pka A 2 3 B 1 2 3 C 3 4

he figure below is the plot of potential energy versus internuclear distance d of H molecule in e electronic ground state What is the value of the net potential energy E as indicated in the figure nkJ mol 1 for d do at which the electron electron repulsion and the nucleus nucleus repulsion nergies are absent As reference the potential energy of H atomis taken as zero when its electron and the nucleus are infinitely far apart Jse Avogadro constant as 6 023 x 1023 mol Potential Energy kJ mol Eo H d H v do Internuclear distance d

1 Consider the following cell reaction 2Fe s O g 4H aq 2Fe aq 2H O 1 E 1 67 V At Fe 10 3 M p O 0 1 atm and pH 3 The cell potential at 25 C is 1 1 47 V 2 1 77 V 3 1 87 V 4 1 57 V

In the given compound which carbon atom will show minimum electronegativity 1 Fourth 3 Third 2 First 4 EN of all the carbon is same

so you did not get a Exercise 1 Complete the sentences with the correct form of the verbs given in brackets If you catch the first bus you there in time get If she If you try again you 4 If you heat iron it 5 We 6 7 8 1 2 3 If they I ll see him if I If we here I will phone you come succeed expand ready if you come at five be today I ll ring her up come free be we ll miss the train not hurry

69 Minimum number of capacitors each of 8 F and 250 V used to make a composite capacitor of 16 F and 1000 V are a 8 b 32 c 16 d 24 79 A capacitor of capacitance C is charged to a

tructure of 21 In an atom two electrons move around the nucleus in circular orbits of radii R and 4R The ratio of the time taken by them to complete one revolution is 1 4 b 4 1 1 8 d 8 7 nergy and the total energy

Consider the following compounds 1 Sodium acetate 2 Acetic acid sodium acetate 3 Acetic acid The pH of their equimolar aqueous solutions will be such that A 3 2 1 B 2 1 3 C 1 2 3 D 3 1 2

4 Rb H 0 88 AB is a covalent compound If electronegativity of A and B 88 AB A are 2 and 3 then percentage covalent character in AB is 23 AB 1 19 5 2 80 5 3 40 4 None of these 1 19 5 2 80 5 3 40 4 9 Effecitve nuclear charge of C is 3 60 then value of x is 89 C 0 85 1 1 2 4 3 6 cfl Eg 3 60 15 25

A gas is allowed to expand in E well insulated container against a constant external pressure of 2 5 atm from an initial volume of 2 50 L to a final volume of 4 50 L The change in internal energy AU of the gas in joules will be 1 500 J 2 505 J 3 505 J 4 1136 25 J For 1 molal aqueous solution of the following compounds which one will show the highest freezing point

23 Which is the correct order of ionization energies 1 F F C Cl 2 F C Cr F 3 F C C F 4 F C F CL 104 If 23 33 1 F F C Cl 2 Exa c F 3 F C C F F d f at

A It is suspected that an acid base titration method has a significant indicator error and thus tends to give results with a positive systematic error i e a positive bias To test this an exactly 0 1 M solution of HCI is used to titrate 20 00 mL of an exactly 0 1 M solution of NaOH and the following results were obtained 20 06 20 18 19 87 20 51 20 34 20 41 Test for positive bias in these results at 95 confidence leve

Suppose that K is a proper subgroup of H and H is a proper subgroup of G If K 42 and G 420 And H has posible subgroups of orders 84 and 210 Does that mean that such subgroups actually exist Why or why not

Insert a few or the few whichever is suitable 1 2 3 4 It is a question of spending 5 6 In public libraries that we have are not well equipped days that are left to him he spends in solitude and meditatio days rest is all that is needed rupees Japanese that are in Mumbai are law abiding citizens words he expressed his gratitude to his friends Exercise 6 Fill in the blanks with a little or a few 1 There will be 2 I need 3 Could you buy 4 My parents give me 5 All we need is 6 Would like to eat 7 There is still 8 My friend knows rest rain this week bottles of water for me luck pocket money every week biscuits bread left celebrities

The ionization constant of benzoic acid is 6 46 x 10 5 and Kc for silver benzoate is 2 5 x 10 13 How many times silver benzoate is more soluble in a buffer of pH 3 19 as compared to its solubility in pure water 1 3 317 2 9 5 3 1000 4 7 5

Which of the following process is exothermic Na s Na g Na g Na g e C g CI g Cl g e Cl g

If a solid PQ having NaCl type structure is heated so that the ions along one body diagonal are lost and trivalent ions R enter interstitial sites to maintain the electrical neutrality so that the new empirical formula unit is P Q R x y z are smallest possible integers The value of x y z is Q form the lattice

2 XX e X g AH 720kJ mol g Calculate the amount of energy required to convert 110 mg of X atom in gaseous state into X ion Atomic wt for X 7 g mol 1 10 4 kJ 3 11 3 kJ 1 720 113 2 12 3 kJ 4 14 5 KJ 752 MAJKI 22 X 9 110 mg X ufafdd e AH 720kJ mot at the fy n Atomic wt for X 7 g mol 1 10 4 kJ 3 11 3 kJ 2 12 3 kJ 4 14 5 k 110 X10 7

46 An element X has the following isotopic composition 200 X 90 X 8 0 2X 2 0 The weighted average atomic mass of the naturally occurring element X is closest to 1 204 amu 4 200 amu 2 198 amu 3 197 amy

Which of the following transformation least energy is required 1 Fg F g e 2 Pg P g e 3 S g S g e 4 Clg Cl g e B CNOP PH3

300 The heat of combustion of ethyl alcohol is Kcal if the heat of formation of CO2 g and H O l are 100 Kcal and 50 Kcal respectively then heat of formation of ethyl alcohol is Question Type Single Correct Type 1 2 3 100 K cal 50 K cal 150 K cal

47 Relative stabilities of the following order CH3O CH3 III 1 I II III NV 3 N II III I I CH CH II CH3CH2 IV 2 N III II I 4 II N III I will b CH

Choose the correct or more suitable forms of the verbs to fill in the blanks 1 The train at 8 20 leaves is leaving 2 We to Hyderabad tomorrow go are going It is late I think I Who is arranging the party Mohan 3 4 5 Tea or coffee 1 6 1 7 The boat is full of water It to bed now will go am going it is going to do will do coffee will have am going to have to Delhi at this time tomorrow am flying will be flying will sink is going to sink

3 48 kcal 4 22 kcal 10 Observe the following reaction A g 3B g 2C g A dt The rate of this reaction min What is the value of 1 3 10 3 2 9 10 3 3 10 3 4 1 5 x 10 3 d B dt A 79 is 3 x 10 3 mol litre in mol litre min 1 92 kcal 2 70 kcal 3 48 kcal 4 22 kcal 10 for N g 3H g d B dt Fax a fa A g 3B g 2C g A dt 3 x 10 mol litre min sin al mol litre min 1 3 x 10 2 9x10 3 3 10 3 4 1 5 x 10 3

Q 1 30 100 Calculate the equilibrium pressure of gaseous mixture that results from the therm decomposition of ammonium chloride at 625 K according to the reaction given below NH4Cl s NH3 g HCl g Assume gaseous mixture behaves as an ideal gas at equilibrium Cp R A BT For NH4Cl s AH 1298K 314 430 kJ kmol AG 1298K 202 870 kJ kmol

A buffer solution is prepared in which the concentration of NH3 is 0 3 M and the concentration of NH is 0 20 M If the equilibrium constant K for NH3 equals 1 8x10 5 what is the pH of this solution 1 9 43 2 11 72 3 8 73 4 9 08

17 Which of the following solutions would be expected to be the best conductor of an electric current at room temperature 1 Point 0 10 M Na2SO4 1 0 M CH3COOH 0 10 M NaCl 0 10 M CO NH2 2 0 10 M CH3COOH

3 RCI RBr RF RI 4 RI RBr RCI RF Identify the correct order of boiling points of the following compounds I CH CH CH CH OH II CH CHCH CHO III CH CH CH COOH 1 I II III 2 III I II 3 I III II 4 III II I HgCl and 12 both when dissolved in water containing I ions the pair of species formed is 1 HgI2 I 3 Hg 1 1 4 Hgl I 2 Hgl

1 3 3 3 Trimethyl 1 propene 3 3 3 Dimethyl 1 butene 3 A solution of metal hydroxide MOH with copper sulphate and mixed tartarate of metal M with another metal M of the same group is used in the detection of CHO group Metal M and M are respectively 1 Na K 2 K Rb 3 K Rb 4 Rb Na A quantity of PC15 was heated in a 2 litre vessel at 525 K It dissociates as 4 2 1 1 1 Trimethyl 2 propene 4 2 2 Dimethyl 3 butene

A 150 mL aqueous solution containing two dissolved sodium salts namely sodium sulfate with a density of 2 66 g mL and sodium chloride with a density of 2 16 g mL was produced by a student The concentrations of the solutes in 150 ml of solution were 4 w v and 10 w w respectively To complete the experiment performed by the student calculate for the following A Mole fraction of the solute with the higher number of moles B Molarity of the solution if it contains ONLY the solute with the higher number of moles C Molality of the solution that you have computed in letter B and D Normality of the solution that you have computed in letter B Molecular weights Sodium chloride 58 443 g mol Sodium sulfate 142 04 g mol Water 18 01528 g mol ANSWER THE FF A Mole fraction of the solute with the higher number of moles B Molarity of the solution if it contains ONLY the solute with the higher number of moles C Molality of the solution that you have computed in letter B D Normality of the solution that you have con omputed in lottor B

7 A 0 6333 g sample of a metal carbonate was reacted with hydrochloric acid A chemical equation for this reaction can be represented as shown below where X is the unknown metal XCO s 2HCl aq XCl aq H O l CO g The carbon dioxide gas generated was collected over water at a temperature of 26 0 C and pressure of 103 80 kPa The final volume of carbon dioxide gas collected was 125 0 mL Determine each of the following a The pressure of the dry gas at this temperature 11 b The moles of carbon dioxide produced 21 c The moles of the metal carbonate reacted 21 d The molar mass of the metal carbonate 17 e The identity of element X and the chemical formula for the metal carbonate 21

71 Acetophenone when reacted with a base C H ONa yields a stable compound which has the strcture CH CH 1 2 OH OH CH CH OH OH 72 The final product C obtained in this reaction 3 CH 4 CH O

10 30 mg of O is dissolved into a liter of sea water of density 1 03 g mL The concentration of Oz in ppm is 1 8 2 12 3 15 4 10

3 Clean water would have a BOD value of less than 5 ppm 4 Oxides of sulphur nitrogen and carbon are the most wider spread air pollutant 50 If NaCl is doped with 10 mol of SrCl the concentration of cation vacancies will be N 6 02 10 mol 1 6 02x10 mol 2 6 02x10 mol 51 Blood cells retain their normal shape in solution which are 3 6 02x10 mol 1 4 6 02x10 5 mol

Predict the correct intermediate and product in the following reaction H C C CH Intermediate product X Y 1 H C C CH Y H C C CH OH So 3 H C C CH Y H C C CH OK 2 H C 2 H C C CH Y H CH Y H C C CH 4 H C C CH Y H C C CH SO HO H SO