| Chapter-1: Some Basic Concepts of Chemistry |
1 . Which of the following halogen can be purified by sublimation
- F2
- Cl2
- Br2
- I2
2. Which has maximum number of atoms?
- 24 g of C (12)
- 56 g of Fe (56)
- 27 gof Al (27)
- 108 g of Ag (108)
3. 1 mol of CH4 contains
- 6.02 × 1023 atoms of H
- 4 g atom of Hydrogen
- 1.81 × 1023 molecules of CH4
- 3.0 g of carbon
4. The -ve charged particles is called :
- Anion
- Cation
- Radical
- Atom
5. Formula of Ferric Sulphate is:
- FeSo4
- B.Fe (So4)3
- C.Fe2 (So4)3
- D.Fe2So4
6. Molarity of 0.2 N H2SO4 is
- 0.2
- 0.4
- 0.6
- 0.1
7. The total number of atoms represented by the compound CuSO4. 5H2O is
- 27
- 21
- 5
- 8
8. The density of a gas is 1.78 gL-1 at STP. The weight of one mole of gas is
- 39.9 g
- 22.4 g
- 3.56 g
- 29 g
9. The balancing of equations is based upon which of the following law?
- Law of Multiple Proportions
- Law of Conservation of Mass
- Boyles Law
- Law of Reciprocal Proportions
10. Any charged particle is called:
- Atom
- Molecule
- Ion
- Mixture
11. Approximate atomic weight of an element is 26.89. If its equivalent weight is 8.9, the exact atomic weight of element would be
- 26.89
- 8.9
- 17.8
- 26.7
12. A chemical formula based on actual number of molecule is called ____ formula:
- Structural
- Molecular
- Empirical
- None
13. The prefix zepto stands for
- 109
- 10-12
- 10-15
- 10-21
14. Which of the following contains same number of carbon atoms as are in 6.0 g of carbon (C – 12) ?
- 6.0 g Ethane
- 8.0 g Methane
- 21.0 g Propane
- 28.0 g CO
15. An atom is 10 times heavier than 1/12th of mass of a carbon atom (C – 12). The mass of the atom in a.m.u. is
- 10
- 120
- 20
- 12