1. When an electron is moving with velocity of 2.188 x 106 ms-1 in the first orbit of Bohrs model of hydrogen. The de Broglie wavelength of electron is ?

2. Which statement is consistent with Hunds rule.

3. Which of the following is mineral fiber.

4. Atomic number of Mn is 25 what is the electronic configuration in the ground state ?

5. When methl iodide and ethyl iodide are treated with sodium metal possible major products are obtained ?

6. On heating aldehydes with Fehlings solution we get a precipitate whose colour is ?

7. Which of the following is mineral fiber.

8. What is maximum number of electrons in an orbital with m (magnetic quantum number) = 3

9. Which catalyst is used in contact process?

10. Which of the following statement is correct ?