1. Give the value of charge of electron in SI units.
2. How many sub levels are there in the M shell? What are their designations?
3. Give the quantum numbers n, l assigned for 3s orbital.
4. Give the electronic configuration of Cl- (chloride) ion.
5. Give the name of the first transition element.
6. Define first ionisation energy.
7. Give the order of removal of electrons present in the 4th orbit of an atom.
8. Why do elements in the same group have similar chemical properties?
9. Find the number of moles present in the given weight of substance:
(a) 54 g of water. (b) 70g of N2
10. Electromagnetic radiation of wavelength 242 nm is just sufficient to ionize the sodium atom. Calculate the ionisation energy of sodium atom in KJ/atom.
11. What is the octet theory? Can formation of NaCl justify it? If yes, explain.
12. What is diagonal relationship? Explain with an example.
13. What is the mass percentage of oxygen in NaOH.
14. Give modern names of (a) Eka Silicon (b) Eka Aluminium
15. If 10 volumes of dihydrogen gas reacts with five volumes of dioxygen gas, how many volumes of water vapour would be produced? (Assume that the temperature is more than 100°C) Explain with suitable balanced equation. Or,
Represent the ammonia molecule and water molecule by Lewis dot structures.
16. Define Hund's rule of maximum multiplicity.
17. What is spin quantum number? Find the number of electrons which posses +1/2 spin in sodium atom.
18. What is covalent radius? How it will vary in a group and in a period?
19. Dinitrogen and dihydrogen react with each other to produce ammonia according to the following chemical equation:
N2 (g) + 3H2 (g) ---> 2NH3 (g)
(i) Calculate the mass of ammonia produced if 2 x 103g dinitrogen reacts with 1 x 103g of hydrogen.
(ii) Will any of the two reactions remain unreacted?
(iii) If yes, which one and what would be its mass? Or
Define molarity. Find molarity of the solution, which is prepared by dissolving 6g of urea in 200 ml water. (Molecular weight of urea = 60)
20. Calculate the formal charge on each atom of ozone based on the given representation
21. What is azimuthal quantum number? Who proposed it? What are its possible values when principal quantum number 'n' value is 3. Give the significance of the azimuthal quantum number.
22. Give the general electronic configuration of f-block elements. Identify the following elements as s & p block elements (i) Na & O (ii) N & Be
23. Write briefly about postulates of Plank's quantum theory.
24. A solution is prepared by dissolving 4g of NaOH in 40g of water.
(a) Find the mass percentage of NaOH (b) Find its molality.
25. What is the azimuthal quantum number value for a 'd' orbital. Draw the shapes of d orbitals along with their designation.
26. How the nature of oxides varies in a period and a group? Give one example for each of the following from the third period of Modern Periodic Table (a) acidic oxide (b) amphoteric oxide (c) basic oxide
27. Discuss the formation of MgO on the basis of Lewis Octet Theory
28. Give one main draw back of Rutherford model of atom. Discuss about the important postulates of Bohr's model of atom Or,
(i) Name the quantum numbers.
(ii) Give the values of four quantum numbers for the differentiating electron of potassium
(iii) Arrange 4s, 3d, 4p & 5p orbitals in their increasing energy order
(iv) Write briefly about the significance of (a) principal quantum number (b) spin quantum number
29. How the following factors can influence ionisation energy of atoms - (a) size of atom (b) effective nuclear charge (c) screening effect (d) electronic configuration. Or,
Discuss briefly about the classification of elements in to s, p, d and f - blocks.
30. (i) What is the significance of Born - Haber cycle? On which it is based ?
(ii) Explain how electro negativity varies in a group and period with proper regions.
(iii) Define electron gain enthalpy. Which element in the periodic table has highest negative gain enthalpy value?
(iv) Give the final expression to calculate the net energy change involved in the formation of one mole of ionic crystals. Or,
Explain the formation of different series of lines in hydrogen spectrum.
<> <> <> <> <>
Don’t Forget to take benefit of these FREE RESOURCES
Keywords: chemistry, class 11, cbse, sample paper, question,