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प्रश्न
Copper having electronic configuration 2,8,18,1 exhibits variable valency. Give a reason for the same and name the compound CuCI and CuCl2.
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उत्तर
Copper exhibit valency ‘1’ and ‘2’ i.e. has variable valency reason for variable valency:
Valency is the number of electrons lost or gained from the outer shell of an atom of an element – during the chemical reaction. Variation in this gain or loss results in ‘variable valency’.
Lower valency ends with – ous
Higher valency ends with – ic
CuCI is named as cuprous chloride (lower valency)
OR
Cu [I] Cl i.e. Copper [I] chloride and CuCl2 – Cupric chloride (higher valency) i.e. Copper [II] chloride Cu[II]Cl2
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संबंधित प्रश्न
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Write the molecular formulae of Iron (III) chloride
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With reference to water and ammonia as compounds respectively, state the valency of oxygen and nitrogen.
Write the chemical formula of the following compound in a step-by-step manner –
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Write the chemical formula of the following compound in a step-by-step manner –
Copper [I] sulphide
Match the statements – 1 to 10 below with their correct answers from – A to J.
| Column I | Column II |
| 1. Elements having valency of two. | A: Br1− |
| 2. An anion | B: Divalent |
| 3. A gaseous non-metal | C: Reactants |
| 4. A cation. | D: Ammonium |
| 5. The term used for the substances which take part in the chemical reaction | E: Nitric oxide |
| 6. The meaning of the symbol ‘Δ’ over the arrow in a chemical equation. | F: Nitrogen |
| 7. The chemical name for nitrogen monoxide. | G: Zero |
| 8. A radical containing nitrogen and hydrogen only | H: Nitrous oxide |
| 9. The chemical name for dinitrogen oxide | I: Heat required |
| 10. The valency of noble gases | J: K1+ |
