Advertisements
Advertisements
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the charge on the particle ?
Concept: undefined >> undefined
Fill in the blank
If an atom gains an electron, it is called an _______
Concept: undefined >> undefined
Advertisements
Fill in the blank
If an atom loses an electron, it acquires ______ a charge.
Concept: undefined >> undefined
Fill in the blank
A charged particle is called an _____
Concept: undefined >> undefined
Fill in the blank
An _______ is electrically neutral.
Concept: undefined >> undefined
Fill in the blank
An excess of electrons produces a ________ charge.
Concept: undefined >> undefined
Fill in the blank
A deficiency of electrons produces a ________ charge.
Concept: undefined >> undefined
Match the following :
| Column A | Column B |
| (a) Global warming | 1. Hydrated ferric oxide |
| (b) Acid rain | 2. Manganese dioxide |
| (c) Rust | 3. Carbon dioxide |
| (d) Catalyst | 4. Methane |
| (e) Photosynthesis | 5. Nitrogen Dioxide |
Concept: undefined >> undefined
What was the ancient belief regarding the nature of matter ?
Concept: undefined >> undefined
Mention the contribution of the following scientists :
- Antoine Lavoisier
- Robert Boyle
- Joseph Priestley
- Sir W. Ramsay
Concept: undefined >> undefined
Match the statements in Column A, with those in Column B.
| Column A | Column B |
| 1. Largest Constituent of air, which dilutes the activity of oxygen. | (a) Oxygen |
| 2. A gas used for filling weather observeation balloons. | (b) Carbonic acid |
| 3. An acid formed by the dissolution of sulphur dioxide gas in water. | (c) Sulphuric acid |
| 4. An acid formed by the dissolution of carbon dioxide in water. | (d) Helium |
| 5. A gas vital for respiration. | (e) Nitrogen |
Concept: undefined >> undefined
Write ‘True’ or ‘False’ in front of following statement.
Atmospheric nitrogen is directly absorbed by the plants to form plant proteins.
Concept: undefined >> undefined
What is greenhouse effect?
Concept: undefined >> undefined
How is greenhouse effect produced?
Concept: undefined >> undefined
Discuss harmful effects of greenhouse effect.
Concept: undefined >> undefined
Fill in the blank:
_____________ discovered the oxygen gas.
Concept: undefined >> undefined
Match the statements in Column A, with those in Column B.
| Column A | Column B |
| 1. Largest Constituent of air, which dilutes the activity of oxygen. |
(a) Oxygen |
| 2. A gas used for filling weather observation balloons. | (b) carbon acid |
| 3. An acid formed by the dissolution of sulphur dioxide gas in water. | (c) Sulphur acid |
| 4. An acid formed by the dissolution of carbon dioxide in water. | (d) Helium |
| 5. A gas vital for respiration. | (e) Nitrogen |
Concept: undefined >> undefined
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will lose electron?
Concept: undefined >> undefined
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will gain electron?
Concept: undefined >> undefined
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form positive ion?
Concept: undefined >> undefined
