| Question (1):
In water, hydrogen and oxygen are present in the ratio of ________. |
| 1. |
1:8
|
| 2. |
2:12
|
| 3. |
2:3 |
| 4. |
1:2 |
|
| Ans: 1 |
|
| Question (2):
An example of a triatomic molecule is ___________. |
| 1. |
Ozone
|
| 2. |
Nitrogen
|
| 3. |
Carbon monoxide |
| 4. |
Hydrogen |
|
| Ans: 1 |
|
| Question (3):
The quantity of matter present in an object is called its _________. |
| 1. |
Mass
|
| 2. |
Volume
|
| 3. |
Density |
| 4. |
Vapour pressure |
|
| Ans: 1 |
|
| Question (4):
Indivisibility of an atom was proposed by ___________. |
| 1. |
Dalton
|
| 2. |
Rutherford
|
| 3. |
Thomson |
| 4. |
Bohr |
|
| Ans: 1 |
|
| Question (5):
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 |
|
| Ans: 4 |
|
| Question (6):
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 |
|
| Ans: 2 |
|
| Question (7):
The atomic mass of sodium is 23. The number of moles in 46g of sodium is ________. |
|
|
| Ans: 1 |
|
| Question (8):
The molecular formula of potassium nitrate is ________. |
| 1. |
KNO
|
| 2. |
KNO3
|
| 3. |
KNO2 |
| 4. |
KON |
|
| Ans: 2 |
|
| Question (9):
Kalium is the Latin name of ________. |
| 1. |
Potassium
|
| 2. |
Krypton
|
| 3. |
Calcium |
| 4. |
Phosphorus |
|
| Ans: 1 |
|
| Question (10):
The smallest particle of a substance that is capable of independent existence is _________. |
| 1. |
Atom
|
| 2. |
Molecule
|
| 3. |
Electron |
| 4. |
Proton |
|
| Ans: 2 |
|
Question (11):
 |
| 1. |
Atomic number
|
| 2. |
Atomic mass
|
| 3. |
Atomic mass scale |
| 4. |
Number of electrons |
|
| Ans: 2 |
|
Question (12):
|
| 1. |
1.25
|
| 2. |
15
|
| 3. |
14 |
| 4. |
12 |
|
| Ans: 2 |
|
| Question (13):
The molecular mass of ammonia is _________. |
| 1. |
17 grams
|
| 2. |
31 grams
|
| 3. |
20 grams |
| 4. |
25 grams |
|
| Ans: 1 |
|
| Question (14):
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 |
|
| Ans: 3 |
|
| Question (15):
The number of atoms in a molecule of the elementary substance is called ________. |
| 1. |
Atomic number
|
| 2. |
Avogadro number
|
| 3. |
Atomic mass |
| 4. |
Atomicity |
|
| Ans: 4 |
|
| Question (16):
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 |
|
| Ans: 1 |
|
| Question (17):
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 |
|
| Ans: 1 |
|
| Question (18):
2 molecules of nitrogen are represented by ________. |
|
|
| Ans: 2 |
|
| Question (19):
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 |
|
| Ans: 3 |
|
| Question (20):
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 |
|
| Ans: 2 |
|
| Question (21):
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 |
|
| Ans: 3 |
|
