CBSE Class 11 Chemistry Sample Paper Set Z Solved

1. High concentration of fluoride is harmful to bones and teeth at levels over

a) 1 ppm    b) 3ppm     c) 5 ppm      d) 10 ppm

2. Which of the following element can show covalency greater than 4.

a) Be         b)B            c) S             d) O

3. Which of the following is not a green house gas

a) CO₂      b) O₃         c)CH₄          d)N₂

4. In Antartica, ,ozone depletion is due to the formation of

a)Acrolein      b)Peroxyacetylnitrate      c)formaldehyde       d)Chlorine nitrate

5. All are primary pollutants except

a) H₂SO₄       b) SO₂       c)NO₂          d) particulate matter

6. The de-Broglie wavelength associated with a body of mass 1000g moving with a velocity 100 ms^-1 is ( h=6.63x10^-34 Js)

a) 6.62 x 10^-39 m         b) 6.62 x 10^-38 m        c) 6.62 x10^-36cm       d) 3.31x10^-32m

7. Which of the following carbonate is the most stable?

a) CaCO₃                     b)MgCO₃                     c)SrCO₃                      d)BaCO₃

8. The polarity of covalent bond is maximum in

a) F-F                          b) C-F                         c) N-F                          d) O-F

9. Suggest the factor which makes Li, the strongest reducing agent in aqueous solution.

a) Sublimation enthalpy                   b)Ionisation enthalpy
c) Hydration enthalpy                      d) Electron gain enthalpy

10. Which of the following species has tetrahedral geometry?

a) BH₄      b)NH₂            c)NH₄ ⁺          d)CO₃^2-

11. ____ and ____ are essential for the transmission of impulses along nerve fibres. 

12. The deep blue colour of the solution of sodium in liquid ammonia is due to________ 

13. Excess nitrate in drinking water can cause disease like__________________ 

14. Bond angle in SF₆ is____________- 

15. The number of electrons ejected is directly proportional to ____ of the light 

16. Give the Bohr formula to calculate the angular momentum of an electron. 

17. Write the name of alkali metal cation which has the highest polarizing power? 

18. Give two examples of odd electron molecules. 

19. Write the name of the block in which element with atomic number 56 belongs? 

20. What is the total number of electrons that can be accommodated in all the orbitals having principal quantum number 2 and azimuthal quantum number 1?

21. What happens when
a) Magnesium is burnt in air b) quick lime is heated with silica?

22. Explain the manufacture of washing soda. 

23. Briefly explain Planck’s Quantum theory.

OR

Distinguish between orbit and orbital.(any two points of difference)

24. a) Electron has negative energy in an atom. Why?
b) How does Bohr model explain the simultaneous appearance of a large number of lines in the hydrogen spectrum?

OR

a) Define photoelectric effect
b) Give the significance of magnetic quantum number

25. The speed of an electron moving at 500m/s is measured within the accuracy of 0.02%. What would be the minimum error in determining its position?
( h=6.63x10^-34 Js, Mass of electron = 9.1 x 10^-31 Kg)

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