XI CBSE Sample Papers

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Here is the exam paper

1. What is the maximum number of electrons that can be present in an atom in which the highest principal quantum number is 4? [1]

2. How is bond order related to the stability of a molecule ? [1]

3. What is the binding force between molecules if a substance is a gas under ordinary conditions of temperature and pressure ? [1]

4. In the reaction;

Mn02 + 4HC1 — MnC12 + C12 + 2H20, which species is oxidized ?

5. How many hydrogen bonded water molecule(s) are present in CuSO4.5H20 ? [1]

6. A sample of NaNO3 weighing 0.83 g is placed in a 50 ml volumetric flask. The flask is then filled with water to the mark on the neck. What is the molarity of the solution ? [2]

7. Determine the empirical formula of an oxide of iron which has 69.9% iron and 30.1% dioxygen by mass. [2]

8. Calculate the hydrogen ion concentration in the following biological fluids whose pH are given : [2]

(a) Human muscle-fluid, 6.83

(b) Human stomach fluid, 1.2

9. Write four major water pollutants. [2]

10. Draw the structures of cis- and trans-isomers of the following compounds name ; [2]

(i) CHCI = CHCI

(ii) C2H5C(CH3) = C(CH3)C2H5

OR

Suggest the name of two Lewis acid other than anhydrous aluminium chloride which can be used during ethylation of benzene. [2]

11. Electromagnetic radiation of wavelength 242 nm is just sufficient to ionize the sodium atom. Calculate the ionization energy of sodium in kJ mol-1.

12. Write the electronic configurations of the following ions : [3]

(a) H+,

(b) Na+.

(c) 02-.

13. Define octet rule. Write its significance and limitations. [3]

14. Assign oxidation number to the underlined elements in each of the following species : [3]

(a) Ca02,

(b) NaBH4,

(c) H2S2O7.

15. Anhydrous A1C13 is covalent but A1C13.6H20 is ionic in nature. How would you account for this ? [31

16. (a) Write chemical reaction to show the amphoteric nature of water.

(b) How does H202 behave as a bleaching agent ? [3]

17. (i) A sample of pure PC15 was stored in an evacuated vessels at 473K. After equilibrium was attained, concentration of PC15 was found to be 0.5 x 10-1 mol L-1. If value of Kc. is

8.3 x 10-3, what are the concentration of PC13 and C12 at equilibrium ?

(ii) Give relation between Kp and IQ for above equation. [3]

18. What will be the pressure of the gas mixture when 0.5 L of H2 at 0.8 bar and 2.0 L of oxygen at 0.7 bar are introduced in a 1 L vessel at 27°C? [3]

19. Explain tropospheric pollution in 100 words. [3]

20. Carry out the following conversions : [3]

(I ) Ethyl alcohol to ethane.

(2) Sodium acetanilide to benzene.

(3) Benzene to nitrobenzene.

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