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प्रश्न
Match the statements in List I – 1 to 10 correct answers in List II-A to J.
| List I | LIst II | ||
| 1 | Fluorine and chlorine | A | Nitrogen |
| 2 | A diatomic molecule | B | Boron |
| 3 | A molecule containing the elements hydrogen and oxygen. | C | Reactants |
| 4 | A metalloid - showing properties of both metals and non-metals. | D | Chemical Formula |
| 5 | The term used for the substances which take part in the chemical reaction | E | Halogens |
| 6 | The term represents a substance by means of symbols. | F | Water |
| 7 | The term used for the substances formed as a result of a chemical reaction | G | Nitric Acid |
| 8 | A compound containing one atom of zinc and two atoms of chlorine. | H | Products |
| 9 | The chemical name for nitrogen monoxide. | I | Phosphorus |
| 10 | A polyatomic molecule. | J | Zinc Chloride |
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उत्तर
| List I | LIst II | ||
| 1 | Fluorine and chlorine | E | Halogens |
| 2 | A diatomic molecule | A | Nitrogen |
| 3 | A molecule containing the elements hydrogen and oxygen. | F | Water |
| 4 | A metalloid - showing properties of both metals and non-metals. | B | Boron |
| 5 | The term used for the substances which take part in the chemical reaction | C | Reactants |
| 6 | The term which represents a substance by means of symbols. | D | Chemical Formula |
| 7 | The term used for the substances formed as a result of a chemical reaction | H | Products |
| 8 | A compound containing one atom of zinc and two atoms of chlorine. | J | Zinc Chloride |
| 9 | The chemical name for nitrogen monoxide. | G | Nitric Oxide |
| 10 | A polyatomic molecule. | I | Phosporis |
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- elements
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Define: Atom
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The positively charged particle of an atom.
Give a reason for the following statement:
Components in a mixture are present in varying proportions and not in a fixed proportion.
With reference to elements – define the term ‘molecule’. Give two examples each of a monoatomic, diatomic & polyatomic molecule.
Give an account of elements known to us.
