Please select a subject first
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A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is such a particle called ?
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A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the mass number of X?
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A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the atomic numebr of X ?
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A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
Does the particle have an excess of electrons or a deficiency of electrons ?
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A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the charge on the particle ?
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If an atom gains an electron, it is called an _______
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If an atom loses an electron, it acquires ______ a charge.
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A charged particle is called an _____
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An _______ is electrically neutral.
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An excess of electrons produces a ________ charge.
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A deficiency of electrons produces a ________ charge.
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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 |
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What was the ancient belief regarding the nature of matter ?
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Mention the contribution of the following scientists :
- Antoine Lavoisier
- Robert Boyle
- Joseph Priestley
- Sir W. Ramsay
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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 |
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Write ‘True’ or ‘False’ in front of following statement.
Atmospheric nitrogen is directly absorbed by the plants to form plant proteins.
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What is greenhouse effect?
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How is greenhouse effect produced?
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Discuss harmful effects of greenhouse effect.
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