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2006 Indian Institute of Technology B.E Automobile Engineering IIT 2006 Chemistry Paper University Question paper



Course: B.E Automobile Engineering   University/board: Indian Institute of Technology





Some basic Concepts of Chemistry

Straight Objective Type Questions: -

1. How many g of KCL would have to be dissolved in 60g H2O to give 25% by wt. of solution?

(a) 20 g

(b) 1.5 g

(c) 11.5 g

(d) 31.5 g

2. If 1 mole of ethanol (C2H5OH) completely burns to CO2 and H2O, the weight of CO2 formed is about

(a) 22 g

(b) 45 g

(c) 66 g

(D) 88 g



3. When 10 g of propane us made to react with 4g of O2 then weight of CO2 produced will be :

(a) 9.98 g

(b) 3.3 g

(c) 4.4 g

(d) 5.5 g



4. 1.12 ml gas is produced at STP by the action of 4.12 mg of alcohol, ROH with methyl magnesium iodide. The molecular mass of alcohol is

[ ROH + CH3MgI à CH4 + RO-Mg+I ]

(a) 16.0

(b) 41.2

(c) 82.4

(d) 156.0



5. How many grams of NaOH will be needed to prepare 250mL of 0.1 M solution?

(a) 1g

(b) 10g

(c) 4g

(d) 6g

6. An ore contains 1.34 % of the mineral argentite, Ag2S, by weight. How many grams of this ore would have to be processed in order to obtain 1.00 g of pure solid silver, Ag?

(a) 74.6 g

(b) 85.7 g

(c) 134.0 g

(d) 171.4 g



7. Hydrogen evolved at NTP on complete reaction of 27gm of Al with excess of aq. NaOH would be

(a) 22.4 litre

(b) 44.8 litre

(c) 67.2 litre

(d) 33.6 litre



8. 12 g of Mg (At mass = 24) will react with an acid to give

(a) one mole of H2

(b) one mole of O2

(c) half mole of O2

(d) half mole of H2



9. At which of the four conditions, the density of nitrogen will be largest?

(a) STP

(b) 273 K and 2 atm

(c) 546 K and 1 atm

(d) 546 K and 2 atm



10. Under identical conditions of temperature, the density of a gas X is three times that of gas Y while molecular mass of gas Y is twice that of X. The ratio of pressures X and Y will be :

(a) 6

(b) 1/6

(c) 2/3

(d) 3/2



11. A gaseous mixture of 2 moles of A, 3 moles of B, 5 moles of C and 10 moles of D is contained in a vessel. Assuming that the gases are ideal and the partial pressure C is 1.5 atm the total pressure is :

(a) 3 atm

(b) 6 atm

(c) 9 atm

(d) 15 atm



12. 5.40 g of an unknown gas at 27oC occupies the same volume as 0.14 g of hydrogen at 17oC and same pressure. The molecular weight of unknown gas is :

(a) 79.8

(b) 81

(c) 79.2

(d) 72.0



13. X mL. of H2 gas effuses through a hole in a container in 5 seconds. The time taken for the effusion of the same volume of gas specified below under identical conditions is:

(a) 10 seconds : He

(b) 20 seconds : O2

(c) 25 seconds : CO

(d) 55 seconds : CO2



14. Volume occupied by molecules of one mole gas at NTP, each having a radius of 10-8 cm is :

(a) 220 litre

(b) 22.4 litre

(c) 10.09 mL

(d) 10.09 litre



15. Four one litre flasks are separately filled with gases hydrogen, helium, oxygen and ozone at the same room temperature and pressure. The ratio of total number of atoms of these gases present in different flasks would be :

(a) 1 : 1 : 1 : 1

(b) 1 : 2 : 2 : 3

(c) 2 : 1 : 2 : 3

(d) 3 : 2 : 2 : 1

Some more....

1. the ratio of oxidation states of Br in potassium bromide to that in potassium bromate is

(1) +1/5

(2) -1/5

(3) -2/5

(4) +3/5



2. in the reaction , Al + Fe3O4 ------> Al2O3 + Fe. The

Number of electron transferred from reductant to

Oxidant is



(1) 8

(2) 4

(3) 16

(4) 24



3 the weight of KOH in its 50 milli equivalent is

(1) 1.6

(2) 2.2

(3) 2.8

(4) 4.8



4. The numbers of neutrons in drops of water (20 Drops = 1 mL) at 4oc

(1) 6.023 x 1022 (2) 1.338 x 1022



(3) 6.023 x 1020 (4) 7.338 x 1022



5 A compound contains 3.2% of oxygen. The

Minimum mol. Weight of the compound is



(1) 300 (2) 440



(3) 350 (4) 500



6 Number of oxalic acid molecules in 100 ml of

0.02 N oxalic acid are



(1) 6.023 x 1023 (2) 6.023 x 1021



(3) 6.023x 1022 (4) 6.023 x 1023



7. The volume of 0.1 Mg Ca (OH) 2 needed for the

Neutralization of 40 ml of 0.05 m oxalic acid is



(1) 10ml (2) 20ml



(3) 30ml (4) 40ml



8. How many milli litre of 0.5 m H2SO4 are needed to

Dissolve 0.5 g of Cu (II) carbonate?

(1) 6.01 (2) 4.5



(3) 8.1 (4) 11.1



9 the largest number of molecule are in

(1) 28 gm of CO (2) 46 gm of C2H5OH



(3) 36 gm of H2O (4) 54 gm of N2O5



10 what volume of CO2 at STP will evolve when 1 gm of

CaCO3 reacts with excess of dil hcl?



(1) 224 ml (2) 112 ml



(3) 56 ml (4) 448 ml



11 the total number of ions present in 1 ml of 0.1 m

Barium nitrate solution is



(1) 6.02 x 108 (2) 6.025 x 1010



(3) 3.0 x 6.03 x1019 (4) 3.0 x 6.02 x 1010



12 how many gm of K2Cr2O7 is present In 1 L of its

N/10 solution in acid medium?



(1) 46 (2) 49



(3) 0.49 (4) 3.9



13 1.82 gm of a metal requires 32.5 ml of 1 N HCl to

Dissolve it. What is equivalent weight of metal?

(1) 46 (2)65





(3) 56 (4) 42



14 the vapour density of a volatile chloride of metal

Is 59.5 and equivalent mass of the metal is



(1) 96 (2) 48



(3) 24 (4) 12



15 1 g Ca was burnt in excess of O2 and the oxide

Was dissolved in water to make up one litre of

Solution the normality of solution is



(1) 0.04 (2) 0.4



(3) 0.05 (4) 0.5



16 The normality of solution obtained by mixing

100ml of 0.2 M H2SO4 with 100ml of 0.2 M NaOH



(1) 0.1 (2) 0.2



(3) 0.5 (4) 0.3



17 In which of the following changes there is a

Transfer of five electrons?



(1) Mno4- ------>Mn+2 (2) CrO42-------> Cr3+


(3) MnO-4 ------> Mno2 (4) Cr2O72- ------> 2Cr3-



18 in which of the following sulphur has the lowest

Oxidation state?



(1) So2 (2) So3



(3) H2SO4 (4) H2S2O8

19 which of the following statements is incorrect?



(1) Oxidation of substance is followed by

Reduction of another



(2) Reduction of substance is followed by

Oxidation of another



(3) Oxidation and reduction are complementary

Reaction



(4) It is not necessary that both oxidation and

Reduction should take place in the same

Reaction

20 which of the following changes involves reduction



(1) The conversion of ferrous sulphate to ferric

Sulphate

(2) the conversion of H2S to S

(3) the conversion of Cl2 to Nacl

(4) the conversion of Zn to ZnsO4



21. for the reaction

3Zn2+ + 2k4[Fe(CN)6]-----> K2Zn3[Fe(CN)6]2 + 6k+,

What will be the equivalent weight of k4[Fe(CN)6],if

The molecular weight of k4[Fe(CN)6] is M ?



(1) M (2) M/2



(3) M/3 (4) M/4



22 The empirical formula of a commercial ion exchange

Resin is C8H7SO3Na. The resin can be used to soften

Water according to the reaction

Ca2+ + 2C8H7SO3Na----->(C8H7SO3-)2Ca + 2Na+.

What would be the maximum uptake of Ca2+ by the

Resin expressed in mole /g resin?

(1) 0.00246 (2) 0.0246



(3) 0.246 (4) 0.0048



23 for the reaction

Ba (OH)2 + 2HCIO3 -----> Ba (CIO3)2 + 2H2O

Calculate the no of mole of H2O formed when

0.1Mole of Ba (OH)2 is treated with 0.0250 mole

HCIO3

(1) 0.1 (2) 0.125



(3) 0.25 (4) 0.025



24 Ammonia gas is passed into water, yielding a

Solution of density 0.93 g/cm3 and containing

18.6% NH3 by weight. The mass og NH3 per ccof

The solution is



(1) 0.17g/cm3 (2) 0.34g/cm3



(3) 0.51 g/cm3 (4) 0.68 g/cm3



25 the no. of moles of KMn4 that will be needed to

React completely with one mole of ferrous

Oxalate in acidic solution is



(1) 3/5 (2) 2/5



(3) 4/5 (4) None of these



26 a mixture of 1.65 x 1021 molecules of X and

1.85 x 1021 molecules of Y weighs 0.688 g.the

Mole wt of X is (assume mol. Wt of Y is 187).



(1) 52 (2) 84



(3) 126 (4) 41.36



27 A mixture of Feo and Fe3O4 when heated in air to

Constant weigh gains 5% in its weight. The % of

Feo in the sample is



(1) 79.75 (2) 20.25



(3) 30.25 (4) none of these



28 A sample of pure calcium weighing 1.35 g was

Quantitatively converted to 1.88 g of pure CaO.

Atomic mass of calcium is



(1) 20 (2) 40



(3) 60 (4) none of these



29 FeS----->Fe3++So3

Eq wt of FeS for this change is(mol.wt.of FeS = M)

(1) M/1 (2) M/5



(3) M/7 (4) M/9



30 The reaction

Cl2 + S2O32- + OH------> So42- + Cl- + H2O
Staring with 0.15 mole Cl2, 0.010 mole S2O32-

0.30 mole OH-, Mole of Cl2 left in solution



(1) 0.11 (2) 0.01



(3) 0.04 (4) 0.09



31 A sample of FeSO4 and FeC2O4 dissolved in

H2SO4. the complete oxidation of sample required

8./3 eq of KMnO4 After oxdation the reaction mixture

Was reduced by Zn On again 0Xidation by

KMmO4Required 5/3eq the mole ratio of FeSO4 and

FeC2O4



(1) 3/7 (2) 7/3



(3) 5/7 (4) 7/5





32 A sample of NaHCO3 + Na2CO3 required 20 ml of

HCl using phenolphthalein as an indicator and 35 ml

More required if methyl orange is used as indicator.

Then molar ratio of NaHCO3 to Na2CO3 is

(1) 1/2 (2) 2/3



(3) 3/4 (4) 1/3





33 when 400 g of a 20% solution by weight was cooled

50 g of solute precipitated the percentage

Concentration of remaining solution?



(1) 8.57% (2) 15%



(3) 12.25% (4) 9.5%



34 12.53 ml of 0.051 M SeO2 reacted with 25.52 ml of

0.1 M CrSO4 solution In the reaction Cr2+ was

Oxidised to Cr3+The Oxidation state at which

Selenium was converted is

(1) 3 (2) +2



(3) 1 (4) 0





35 the volume of 3M HNO3 required to Oxidised 8 g

Fe2+ is

(HNO3 + Fe2+ -----> Fe3+ + NO + H2O)



(1) 8ml (2) 16ml



(3) 32ml (4) 64ml



36 the stoichiometric coefficient of S in the following

Reaction

H2S + HNO3 -----> NO + S+ H2O



(1) 1 (2) 2



(3) 3 (4) 4



37 0.92 gm of Ag2CO3 heated strongly After

Heating the amount of residue is



(1) 0.36 gm (2) 0.39 gm



(3) 0.77 gm (4) 0.72 gm





38 200 ml of 0.01 M KMnO4 Oxidise 20 ml of

H2O2 sample in acidic medium the volume

Strength of H2O2



(1) 2.8volume (2) 5.6volume



(3) 0.5volume (4) 0.25volume





39 4 Mol of a mixture of Mohr salt and Fe2(S)3

Required 400ml of 0.5 M KMO4 for complete

Oxidation in acidic medium the % of Mohr's

Salt in the mixture is



(1) 40% (2) 5%



(3) 50% (4) 25%





40 equal volume pf 1 M each of KMNo4 and

K2Cr2O7 are used to Oxidise Fe(II) solution In

Acidic medium The amount of Fe oxidised will be



(1) More with KMnO4 (2) More with K2C2O7



(3) Equal with both (4) Cannot be determined





Objective Type Question (More Than One Option Is Correct)



1 when Na2S2O3 is reacted with I2 to form Na2S4O6

And Nal then which statement is correct?



(1) n-factor for Na2S2O3 is one

(2) n-factor for I2 is two

(3) 2moles of Na2S2O3is reacted with one mole of I2

(4) n-factor for Na2S4O6





2 consider the reaction



aFeS2 + bO2-------> cFe2O3 + dSO2



(1) n-factor for FeS2 is 11

(2) The ratio of moles of a:b is 4:11

(3) The ratio of moles of a : b is 11 :4

(4) the ratio of moles of c : d is 1: 4



3 for the following balanced redox reaction

2MnO-4 + 8H+ Br2 -------> 2Mn2+ + 2BrO-3 + 2H2O If

The molecular weight of MnO-4 and Br2 are x&y

Respectively then

(1) Equivalent weight of MnO-4 is x/5

(2) Equivalent weight of Br2 is Y/5

(3) Equivalent weight of Br2 is Y/10

(4) n-factor Ratio of MnO- and Br2 is 2 : 1



4 150 mo m/10 Ba(MnO4)2 in acidic medium can

Oxidise completely

(1) 150ml 1M Fe2+

(2) 50ml 1M FeC2O4

(3) 100 ml 1M C2O42-

(4) 75 ml 1M K2Cr2O7



5 1 mole of CO2 contains



(1) 6.023 x 1023 atoms of O

(2) 6.023 x 1023 atoms of C

(3) 6.023 x 1023 atoms of CO2 mole

(4) all of these



6 the strength of “20 volume" H2O2 is equal to

(1) 60.86 g/I (2) 3.58 N



(3) 1.79M (4) 3.035%





7 10 g carbon reacts with 100 g Cl2 tp form CCl4

The correct statement is



(1) carbon is the limiting reagent

(2) Cl2 is the limiting reagent

(3) 108.45 g CCl4 is formed

(4) 10833 moles



8 when 1 mole of KMnO4 is reacted with FeC2O4 in

Acidic medium then the reacted amount of FeC2O4

is



(1) 5/3 moles (2) 5 equivalents



(3) 3/5 moles (4) 3 equivalent



9 For reaction

A + 2B------->2C

5 moles of A and 8 moles of B are reacted then



(1) Whole A is consumed

(2) Whole B is consumed

(3) 8 Moles of C are formed

(4) 8 equivalent of c are formed



10 For reaction

A + 2B------->2C +D

The correct statement is



(1) Equivalents of A= 2x equivalent of B

(2) Moles of A reacted = Moles of D formed

(3) Equivalent of B = Equivalents of C

(4) 2x moles of B reacted = moles of c formed



11 12g of mg will react completely with an acid to give



(1) 1moles of O2 (2) ½ mole of H2



(3) 1 equivalent of H2 (4) 2 equivalent of H2



12 which of the following contains the greatest number of

Atoms?



(1) 1g of O (2) 1g of O2



(3) 1g O3 (4) 1g F2



13 1 gram atom of Na is equivalent to



(1) 1 gram equivalent of Na

(2) 13g

(3) 23g

(4) 1g



14 0.5 g of fuming H2SO4 g oleum is diluted with water

This solution is completely neutralized by 26.7 ml of

0.4 N NaOH the correct statement is /are



(1) Mass of SO3 is 0.104 g

(2) % of free SO3 = 20.7

(3) N of H2SO4 for neutralization is 0.2 N

(4) Weight of H2SO4



15 100ml of 0.02 N Oxalic acid is equivalent to



(1) 100ml of 0.01M oxalic acid

(2) 6.023 x 1020 molecules of oxalic acid

(3) 50ml of 0.02 M oxalic acid

(4) 100 ml of 0.02M oxalic




Assertion – reason type question (only one is correct)

1 STATEMENT-1: The equivalent mass of KMnO4 in acidic medium is M/5 where M = Molecular mass of KMnO4

Because

STATEMENT-2: Equivalent mass is equal to product of molecular mass and change in oxidation number.



(1) statement – 1 is true, statement -2 is true , statement -2 is a correct explanation for statement -1

(2) statement - 1 is true, statement -2 is true , statement -2 is not correct explanation for statement -1

(3) statement - 1 is true , statement -2 is false

(4) statement - 1 is false , statement-2 is true



2 STATEMENT-1: H3PO4 only two H-atoms are replaceable

Because

STATEMENT-2: Equivalent mass is equal to product of molecular mass and change in oxidation number.

(1) Statement – 1 is true, statement -2 is true, and statement 2 is a correct explanation for statement 1

(2) Statement - 1 is true, statement -2 is true, statement -2 is not correct explanation for statement -1

(3) statement - 1 is true, statement -2 is false

(4) statement - 1 is false, statement-2 is true



3 STATEMENT-1: 18gm of water vapour and 18gm of ice will not contain the same number of molecules


Because



STATEMENT-2: Number of molecules is temperature and pressure



(1) statement – 1 is true, statement -2 is true, statement -2 is a correct explanation for statement -1

(2) statement - 1 is true, statement -2 is true, statement -2 is not correct explanation for statement -1

(3) statement - 1 is true, statement -2 is false

(4) statement - 1 is false, statement-2 is true



4 STATEMENT-1: atomic mass of mg
is 24

Because

STATEMENT-2: an atom of mg is 24 times heavier than 1/12th of the mass of carbon atom (C12)



(1) statement – 1 is true, statement -2 is true, statement -2 is a correct explanation for statement -1

(2) statement - 1 is true, statement -2 is true, statement -2 is not correct explanation for statement -1

(3) statement - 1 is true , statement -2 is false

(4) statement - 1 is false, statement-2 is true

5 STATEMENT-1: The oxidation number chromium in CrO5 is + 6



Because



STATEMENT-2: All the Oxygen present in CrO5 is in the form of Oxide



(1) statement – 1 is true, statement -2 is true, and statement 2 is a correct explanation for statement 1

(2) statement - 1 is true, statement -2 is true, statement -2 is not correct explanation for statement -1

(3) statement - 1 is true, statement -2 is false

(4) statement - 1 is false, statement-2 is true



6 STATEMENT-1: For the reaction Cu2S------->Cu2+ +SO2 Y moles of Cu2S is equal to 8y equivalent of Cu2S

Because

STATEMENT-2: since the N factor of Cu2S is 8 and number of equivalents = mole x n factor

(1) statement – 1 is true, statement -2 is true, statement -2 is a correct explanation for statement -1

(2) statement - 1 is true, statement -2 is true, statement -2 is not correct explanation for statement -1

(3) statement - 1 is true, statement -2 is false

(4) statement - 1 is false, statement-2 is true

7 STATEMENT-1: for the reaction NoaH + H2CO3-------> NaHCO3 + H2O equivalent weight of
H2CO3 is 62

Because

STATEMENT-2: n factor of H2CO3 is 1 and equivalent mass = molecular mass/n factor

(1) statement – 1 is true, statement -2 is true , statement -2 is a correct explanation for statement -1

(2) statement - 1 is true, statement -2 is true , statement -2 is not correct explanation for statement -1

(3) statement - 1 is true , statement -2 is false

(4) statement - 1 is false , statement-2 is true

Match the Matrix (this is same like match the following but 1 question can have more than 1 option correct)

1 Match the following



column -1 column- 2



a number of carbon atoms in 1g molecule of CO2 (1) 0.5 N0



b Number of Molecules in 48 g O2 (2) N0



c No. of molecules In 11.2 / H2 at STP (3) 3 N0



d No. of atoms in 1 moles of NH3 (4) 0.5 N0

(N0 = Avogadro's Number)

2 Match the following



column -1 column- 2(n-factor)



a KMnO4 in acidic medium (1) 10



b Ba(MnO4)2 in acidic medium (2) 6



c S2O32- in alkaline medium (3) 5



d K2Cr2O7 in acidic medium (4) 8


3 Match the following



column -1 column- 2(n-factor for reactant)



a Cu2S is converted into Cu2+ & SO2 (1) 11



b FeC2O4 is converted into Fe3+ & CO2 (2) 4



c CuS is converted into Cu & SO2 (3) 8



d Fes2 is converted into Fe3+ & SO2 (4) 3



Numericals in Mole Concept

Compound X contains 0.25% iron by mass. The molecular mass of X is 89600. Calculate the number of iron atoms per molecule of X.

150 mL of N/10 HCl is required to react completely with 1.0g of a sample of limestone. Calculate the percentage purity of calcium carbonate.

A bulb of unknown volume V contains an ideal gas at 1 atm pressure. This bulb was connected to another evacuated bulb of volume 0.5 L through a stopcock. When stopcock was opened the pressure at each bulb becomes 530 mm of Hg while the temperature remained constant. Find V in litres.

A jar contains a gas and a few drops of water. The pressure in the jar is 830 mm of Hg. The temperature of the jar is reduced by 1%. The vapor pressure of water at two temperatures are 30 and 25 mm of Hg. Calculate the new pressure in jar.

When a certain quantity of ozone was ozonised in suitable apparatus, the volume decreases by 4mL.On addition of turpentine oil, the volume decreases further by 8 mL. Find the formula of ozone, assuming all measurements are made at same temperature and pressure.

Two flask of equal volume connected by narrow tube ( of negligible volume) are at 27oC and contains 0.7 moles of H2 at 0.5 atm. One of the flask is then immersed in a bath kept at 127oC, while the other remains at 27oC. Calculate the final pressure and the number of moles of H2 in each flask.






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