Download CBSE Chemistry Sample Papers Class XI (11th) 2006

Sample Paper 2006

Chemistry

CLASS :XI

(set-1)

General instructions

1. All questions are compulsory
2. Do all the questions.
3. All questions are of 5 marks.
4. You have to attempt 5 marks from each question ________________________________________________________________________

 

Q1. (A)  Name the metals which are associated with the following process:

1)    Aluminothermy

2)    Bessemer converter                            1+1

Or

(A)   Complete the  following reactions:

                          RX   +   AgNO₂       à    ?  +  ?

                           RCOOAg    +  Br₂     à   ?                                                1+1

(B) Outline the principles of refining of metals by the following methods:

1)    Electrolytic Refining

      2) Zone Refining

3)    Vapour Phase Refining         

                                                                        1+1+1

Or

(B) Give the general formula for

• Oxides of first group
• Halides of second Group
• Hydrides of first group.                                                                       1+1+1

 

Q2. (A) Differentiate between

• Precision and Accuracy
• Gram Molecular Mass  and Gram Atomic Mass                                 1+1

Or

(A) How many moles of NaOH are in there 27 mL of 0.15 M NaOH?              2                              

(B) Zinc and Hydrochloric acid react according to the reaction:

Zn(s)    +     2 HCl    à    ZnCl₂ (aq)     +     H₂(g)

If 0.30 mol Zn is added to hydrochloric acid containing 0.52 mol HCl, how many moles of H₂   are produced?                                                                                                       3

 

Q3. (A)  Give the stick, condensed and bond line formulae for C₄H₁₀O.         2

Or

(A)  Discuss the stability of Carbocations.                                                      2

Or

(A)   Explain

o    Hyperconjugation Effect

o    Electromeric Effect                                                           1+1

(B) Give the IUPAC names of the following compounds:

                                                   1+1+1

Or

(B) Discuss the Permutit method for removal of the hardness of water.        3                                                                     

Q4. (A) What is the relationship between the members of the following pairs of structures? Are they identical, structural or geometrical, or resonance contributors?

                                         2

 

Or

(A)   Give the test for the quality detection for Nitrogen and Sulphur.                 2

Or

(A)   Explain that how the quantity of Halogen is detected in the Organic Compound.                                                                                       2

(B)   Explain one of the methods to determine the molecular mass of the organic compound. (It should not be Mass Spectrometry method).                    3

Or

(B)An acid of molecular mass 104 contains 34.6% carbon and 3.85% Hydrogen. Suggest a structure for the acid.                                                                                  3

 

Q5. (A) Calculate the density of ammonia at 30⁰C and 5 bar pressure.                    2

Or

(A) Differentiate between Ideal Gas and Real gas.                                                      2

(B) Define

a)    Vapour Pressure

b)    Coefficient of Viscosity

c)     Surface Tension                                                                      1+1+1

Or

(B)   Define

a)    Isobars

b)    Isotones

c)    Isotopes                                                                       1+1+1

 

Q6. (A) Explain the spectrum of the Hydrogen.                                              2

Or

(A) Comment:

a)    Bohr’s Orbits are called Stationary Orbits

b)    Energy of electron in nth orbit of Hydrogen is negative             1+1

Or

(A)   Explain

a)    Zeeman Effect

b)    Stark Effect                                                                             1+1

 

 (B) Differentiate between Absorption Spectrum and Emission Spectrum.      3

Or

(B) Calculate the energy of one mole of photons having frequency 5 * 10¹⁴  Hz.  3

 

Q7. (A) Which of the following pairs of elements would you expect to have lower ionization energy?

a)    Cl or F

b)    K or Ar                                                            2

Or

        (A) Give the Isoelectronic Species of Na⁺, Cl^-, Fe³⁺ and Cu²⁺              2         

        (B) Explain the variation of any two from Atomic Radii, Ionization Enthalpy and Electron affinity along a Period and a Group.                                                   3
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