B1 Chemistry fiitjee papers

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 FAC-REC CHEMISTRY B1 Vasisht House, 7/2, Begampur, Kalu Sarai, Sarvapriya Vihar New. Delhi.   110017, Ph.:011-46106000, 46106111, 46106114 {1} 1. The dissociation equilibrium pressure of NH 4 SH (s) is 60 cm of Hg at 27°C. The total pressure at equilibrium when the NH 4 SH is dissociated in presence of 45 cm of Hg NH 3 is  A. 105 cm B. 100 cm C. 85 cm  D. 75 cm  E. 90 cm 2. Red hot carbon will re move oxygen from the oxides XO and YO but not from ZO. Y will remove oxygen from XO. Use this evidence to predict the order of activity of the three metals X, Y and Z putting the most reactive first.  A. X, Y, Z B. Z, Y, X C. Y, X, Z  D. Z, X, Y  E. X, Z, Y 3. NO2 + ne NH2 For this reaction, cha nge in ox idation state of Nitrogen is  A. 5 B. 6 C. 4  D. 2  E. 3 4. Which one of the following is correctly written in co rrect order as per the property given in the bracket?  A. NH 3 < PH 3 (Bond angle) B. XeO 3 > XeF 4 (Number of lone pairs) C. BF 3 > H 2 O (Bond angle)  D. C 2 H 2 < C 2 H 4 (% character of s - orbital)  E. PF 3 < PCl 3 (Bond angle) 5. Order of lattice enthalpy is as  A. BeF 2 > MgF 2 > CaF 2 > SrF 2 B. BeF 2 < MgF 2 < CaF 2 < SrF 2 C. LiF < LiCl < LiBr < LiI  D. LiI < LiBr < CsBr < CsI  E. LiI = LiF > LiCl > LiBr 6. Correct order of stability of carbanion  A. IV > I > III > II B. III > II > I > IV C. II > III > I > IV  D. IV > I > II > III  E. I > II > III > IV

Transcript of B1 Chemistry fiitjee papers

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FAC-REC CHEMISTRY B1

Vasisht House, 7/2, Begampur, Kalu Sarai, Sarvapriya Vihar New. Delhi. – 110017, Ph.:011-46106000, 46106111, 46106114

{1}

1.  The dissociation equilibrium pressure of NH4SH

(s)is 60 cm of Hg at 27°C. The total pressure at

equilibrium when the NH4SH is dissociated in presence of 45 cm of Hg NH

3is

 A.  105 cm B.  100 cm

C.  85 cm  D.  75 cm E.  90 cm

2.  Red hot carbon will remove oxygen from the oxides XO and YO but not from ZO. Y willremove oxygen from XO. Use this evidence to predict the order of activity of the three metals X,Y and Z putting the most reactive first.

 A.  X, Y, Z B.  Z, Y, X

C.  Y, X, Z  D.  Z, X, Y

 E.  X, Z, Y

3.

  NO2 + ne NH2 For this reaction, change in oxidation state of Nitrogen is A.  5 B.  6

C.  4  D.  2

 E.  3

4.  Which one of the following is correctly written in correct order as per the property given in thebracket?

 A.  NH3< PH

3(Bond angle) B.  XeO

3> XeF

4(Number of lone pairs)

C.  BF3> H

2O (Bond angle)  D.  C

2H

2< C

2H

4(% character of s - orbital)

 E.  PF3< PCl

3(Bond angle)

5.  Order of lattice enthalpy is as

 A.  BeF2> MgF

2> CaF

2> SrF

2B.  BeF

2< MgF

2< CaF

2< SrF

2

C.  LiF < LiCl < LiBr < LiI  D.  LiI < LiBr < CsBr < CsI

 E.  LiI = LiF > LiCl > LiBr

6.  Correct order of stability of carbanion

 A.  IV > I > III > II B.  III > II > I > IV

C.  II > III > I > IV  D.  IV > I > II > III

 E.  I > II > III > IV

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FAC-REC CHEMISTRY B1

Vasisht House, 7/2, Begampur, Kalu Sarai, Sarvapriya Vihar New. Delhi. – 110017, Ph.:011-46106000, 46106111, 46106114

{2}

7. A tertrahedral void in fcc is formed by atoms at

 A.  3 corners + 1 face centre

B.  3 face centres + 1 corner

C.  2 face centres + 2 corners

 D.  2 face centres + 1 corner + 1 body centre

 E.  3 corners + 1 Body corners

8. 0.1 M aqueous solution of K4

[Fe(CN)6] will have the same freezing point as 0.1 M aqueous

solution of

 A.  Al2(SO

4)

3B.  Ca

3(PO

4)

2

C.  Both A & B  D.  K3[Fe(CN)

6]

 E.  Both B & D

9. 1 gm equivalent of Na metal is formed from electrolysis of fused NaC l. Moles of Al from fusedNa

3AlF

6will be formed by passage of same current, shall be

 A.  1/2 B.  1/3

C. 2  D.  4

E.  5

10. The conductivity of pure water is 5.5 × 10–8

Ω–1

cm–1

. The resistance measured for this sample of

water in the conductivity cell (Cell constant = 0.225 cm–1

) is

 A.  4.09 × 106Ω B.  4.09 × 10

C.  4.09 × 102Ω  D.  4.09 × 10

10Ω

 E.  4.09 × 105Ω 

11. Select the correct statement regarding activation energy

 A.  Activation energy may be greater than heat of reaction

B.  Activation energy is less than threshold energy

C.  Rate of reaction is inversely proportional to the activation energy

 D.  A, B, C only

 E.  B and C only

12. When 400 g of a 20% solution by weight was cooled, 50 g of solute precipitated. The percentageconcentration of remaining solution?

 A.  8.57% B.  15%

C.  12.25%  D.  9.5%

 E.  10.05%

13. Choose the correct option from the following regarding electronegativity

 A.  B > Al > Ga > In B.  B > Al = Ga = In

C.  B < Al < Ga < In  D.  B > Al < Ga < In E.  In > Ga < Al > B

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FAC-REC CHEMISTRY B1

Vasisht House, 7/2, Begampur, Kalu Sarai, Sarvapriya Vihar New. Delhi. – 110017, Ph.:011-46106000, 46106111, 46106114

{3}

14.  Among the statements, the incorrect one is

 A.  calamine and siderite are carbonates

B.  argentite and cuprite are oxides

C.  zinc blende and pyrites are sulphides

 D.  malachite and azurite are ores of copper.

 E.  Ruby silver is ore of silver and antimony

15. Ammonium dichromate is used in some fireworks. The green coloured power blown in the airis

 A.  CrO3  B.  Cr2O3 

C.  Cr  D.  CrO(O2)

 E.  CrO5 

16.  The pair of compounds in which both the compounds give positive test with Tollen’s reagent is

 A.  glucose and sucrose B.  fructose and sucrose

C.  acetophenone and hexanal  D.  glucose and fructose

 E.  hexanol and glucose

17.  At 25°C and 1 atm which one of the following has a non-zero 0fHΔ

 A.  Fe B.  O

C.  C (graphite)  D.  Ne

 E.  Cu

18.  Which of the following options give incorrect melting point order

 A.  H2 < T2 B.  He > T2

C.  D2 > He  D.  T2 > D2

 E.  T2 > He

19.  When an ideal gas undergoes unrestrained expansion, no cooling occurs because the molecules

 A.  are above the inversion temperature

B.  exert no attractive forces on each other

C.  do work equal to loss in kinetic energy

 D.  collide without loss of energy

 E.  kinetic energy of gas molecule increases.

20.  From the given graph

Which of the following statement is correct?

 A.  The point B represents the state of equilibrium

B.  The equilibrium composition strongly favours the reactant

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FAC-REC CHEMISTRY B1

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C.  From the point B formation of product is more spontaneous than that of reactant

 D.  From the point B formation of reactant is more spontaneous than that of product

 E.  B and C Only

21.  Radioactive elements with an atomic number greater than 83 often decompose with the

emission of this particle.

 A.  alpha particle B.  positron

C.  beta particle  D.  Gamma ray

 E.  Neutron

22. In which of the following cases, the element is oxidsed into its highest oxidation state when itreacted with O3 under moist condition

1. S 2. I2

3. P 4. As

 A.  1 only

B.  3 and 4 only

C.  2 and 3 only  D.  3 only

 E.  1, 2 and 4 only

23. The standard state for redox reactions includes

 A.  the temperature is 25°C

B.  concentrations of soluble species are 1 molar

C.  saturated solutions of slightly soluble species are the standard state

 D.  partial pressures of gases are 1 atmosphere

 E.  all of the above are true24. Which of the following is the correct method of preparing a buffer solution?

 A.  Mix the correct amounts of a weak acid and its conjugate base.

B.  Neutralize a weak base partially with strong acid.

C.  Neutralize a weak acid partially with a strong base.

 D.  Add the appropriate amount of strong acid to an acid salt.

 E.  All of the above methods may be use to prepare buffers.

25. Which of the following salts is expected to produce an alkaline solution when one mole isdissolved in one liter of water?

 A.  NaClO4  B.  CaCl2 

C.  NH4Br  D.  Na2S

 E.  Fe(NO3)3 

26. An element E + NaOH → disproportionated product onacidification⎯⎯⎯⎯⎯→ E comes back. Theabove process is true for which of the following pairs?

1. Cl2 and Br2 2. S and Br2

3. P and F2 4. S and I2

 A.  1 only B.  3 and 4 only

C.  2 and 3 only  D.  3 only

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FAC-REC CHEMISTRY B1

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{5}

 E.  1, 2 and 4 only

27. Total number of geometrical isomers for the complex [RhCl(CO) (PPh3) (NH3] is

 A.  1 B.  2

C.  3  D.  5

 E.  6

28. A decapeptide (mol wt 796) on complete hydrolysis gives glycine (mol wt 75), alanine andphenyl alanine, glycine contributes 47.0% to the total weight of the hydrolysed product. Thenumber of glycine unit present in the decapeptide is

 A. 1 B. 6

C.  7  D. 8

 E.  4

29. The co-ordination number of Al in the crystalline state of AlCl3 is

 A.  1

B.  3

C.  6  D.  8

 E.  4

30. Which of the following statement is/are true about catalyst

1. increases the average kinetic energy of reaction molecule

2. alters the reaction mechanism

3. decreases the activation energy

4. increases the frequency of collision of reacting species

5. decrease the threshold energy A.  1, 2, 3 only B.  2, 3, 5 only

C.  4, 5 only  D.  2, 3 only

 E.  All of the above