Question 1
Question: In water, hydrogen and oxygen are present in the ratio of ________.
| 1. | 1:8 |
| 2. | 2:12 |
| 3. | 2:3 |
| 4. | 1:2 |
Answer: 1
Question 2
Question: An example of a triatomic molecule is ___________.
| 1. | Ozone |
| 2. | Nitrogen |
| 3. | Carbon monoxide |
| 4. | Hydrogen |
Answer: 1
Question 3
Question: The quantity of matter present in an object is called its _________.
| 1. | Mass |
| 2. | Volume |
| 3. | Density |
| 4. | Vapour pressure |
Answer: 1
Question 4
Question: Indivisibility of an atom was proposed by ___________.
| 1. | Dalton |
| 2. | Rutherford |
| 3. | Thomson |
| 4. | Bohr |
Answer: 1
Question 5
Question: The value of Avogadro constant is ___________.
| 1. | 6.022 x 1024 |
| 2. | 6.022 x 1022 |
| 3. | 60.22 x 1023 |
| 4. | 6.022 x 1023 |
Answer: 4
Question 6
Question: All samples of carbon dioxide contain carbon and oxygen in the mass ratio of 3:8. This is in agreement with the Law of ___________.
| 1. | Conservation of Mass |
| 2. | Constant Proportion |
| 3. | Multiple Proportion |
| 4. | Reciprocal Proportion |
Answer: 2
Question 7
Question: The atomic mass of sodium is 23. The number of moles in 46g of sodium is ________.
| 1. | 2 |
| 2. | 1 |
| 3. | 4 |
| 4. | 0 |
Answer: 1
Question 8
Question: The molecular formula of potassium nitrate is ________.
| 1. | KNO |
| 2. | KNO3 |
| 3. | KNO2 |
| 4. | KON |
Answer: 2
Question 9
Question: Kalium is the Latin name of ________.
| 1. | Potassium |
| 2. | Krypton |
| 3. | Calcium |
| 4. | Phosphorus |
Answer: 1
Question 10
Question: The smallest particle of a substance that is capable of independent existence is _________.
| 1. | Atom |
| 2. | Molecule |
| 3. | Electron |
| 4. | Proton |
Answer: 2
Question 11
Question: 
| 1. | Atomic number |
| 2. | Atomic mass |
| 3. | Atomic mass scale |
| 4. | Number of electrons |
Answer: 2
Question 12
Question: 
| 1. | 1.25 |
| 2. | 15 |
| 3. | 14 |
| 4. | 12 |
Answer: 2
Question 13
Question: The molecular mass of ammonia is _________.
| 1. | 17 grams |
| 2. | 31 grams |
| 3. | 20 grams |
| 4. | 25 grams |
Answer: 1
Question 14
Question: Atomic mass of calcium is 40. The mass of 2.5 gram atoms of calcium is _______.
| 1. | 40 g |
| 2. | 2.5 g |
| 3. | 100 g |
| 4. | 80 g |
Answer: 3
Question 15
Question: The number of atoms in a molecule of the elementary substance is called ________.
| 1. | Atomic number |
| 2. | Avogadro number |
| 3. | Atomic mass |
| 4. | Atomicity |
Answer: 4
Question 16
Question: Avogadro number represents the number of atoms in ________.
| 1. | 12 grams of 12C |
| 2. | 320 grams of sulphur |
| 3. | 32 grams of oxygen |
| 4. | 1 gram of 12C |
Answer: 1
Question 17
Question: The number of moles in 5 grams of calcium is _________.
| 1. | 0.125 mole |
| 2. | 5 mole |
| 3. | 1.25 mole |
| 4. | 12.5 moles |
Answer: 1
Question 18
Question: 2 molecules of nitrogen are represented by ________.
| 1. | N |
| 2. | 2N2 |
| 3. | N2 |
| 4. | 2N |
Answer: 2
Question 19
Question: One mole of H2O corresponds to
| 1. | 22.4 litre at 1 atm and 250C |
| 2. | 6.02 x 1023 atoms of hydrogen and 6.02 x 1023 atoms of oxygen |
| 3. | 18 g |
| 4. | 1 g |
Answer: 3
Question 20
Question: The number of molecules in 4.25 g of ammonia is approximately
| 1. | 1.0 x 1023 |
| 2. | 1.5 x 1023 |
| 3. | 2.0 x 1023 |
| 4. | 3.5 x 1023 |
Answer: 2
Question 21
Question: A sample contains 22 g of carbon dioxide. This is equal to
| 1. | One molar volume of carbon dioxide |
| 2. | One mole of carbon dioxide |
| 3. | Half mole of carbon dioxide |
| 4. | Two moles of carbon dioxide |
Answer: 3
