Please select a subject first
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State a specific reason for using gold in jewellery
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State whether the statement given below is true or false. If false write the correct statement.
Silicon is an example of a metalloid.
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Differentiate between the following with suitable examples- A basic radical and an acid radical
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Fill in the blank:
A radical with one atom of sulphur and three atoms of oxygen are __________.
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Select the correct answer to the statement given below:
An elementary particle of matter – of a group of atoms of different elements behaving as a single unit with charge on the group.
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Match the radicals in List I with their correct names from List II.
| List I | List II | |
| 1. `"NO"_3^(1-)` | A: Bisulphite | F: Sulphate |
| 2. `"HSO"_4^(1-)` | B: Phosphate | G: Nitrate |
| 3. `"SO"_4^(2-)` | C: Carbonate | H: Phosphite |
| 4. `"PO"_4^(3-)` | D: Nitrite | I: Sulpite |
| 5. `"HCO"_3^(1-)` | E: Bicarbonate | J: Bisulphate |
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Name the following:
The radical containing one nitrogen and four hydrogen atoms.
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Answer the question put against the following constituents of air:
Nitrogen : Explain its significance for plants and animals.
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Answer the question put against the following constituents of air :
Oxygen : What is the percentage proportion of oxygen in air ? Why is oxygen called active air.
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Answer the question put against the following constituents of air :
Water vapours : Explain their role in modifying the earth’s climate.
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Define the term Global warming.
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Define the term smog.
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“Air is a mixture”. Support this statement citing at least three evidences.
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What is air pollution ? What are the harmful effects of sulphur dioxide, nitrogen dioxide and hydrogen sulphide present in the air ?
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Answer the question put against the following constituents of air :
Carbon dioxide : “Although carbon dioxide plays no role in respiration, all life would come to an end if there is no carbon dioxide in air.” Support this statement with relevant facts.
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What are the causes of air pollution?
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Suggest five measures to prevent air pollution.
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What is nitrogen-fixation?
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What are the two ways in which nitrogen fixation occurs?
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Explain the conversion of nitrogen into nitrates during lightning.
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