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प्रश्न
Write the chemical formula of the following compound in a step-by-step manner –
Sodium zincate
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उत्तर
Write the formula of
| Sodium zincate | Symbol | Valency |
| Sodium | \[\ce{Na}\] | \[\ce{1^{+}}\] |
| Zincate | \[\ce{ZnO2}\] | \[\ce{2^{-}}\] |
Step I – Write each symbol with its valency.
Positive ion is written first
\[\ce{Na}^{1+}\] \[\ce{[ZnO2]}^{2-}\]
Step II – Interchange the valencies ignoring (+) and (−) signs.
The Formula is \[\ce{Na2ZnO2}\]
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Complete the statement given below by filling in the blanks with the correct words.
The valency of iron in FeO is _______ of chlorine [chloride] in CaCl2 is ________ and of dichromate in K2 Cr2 O7 is ________.
Match the compounds in List I – 1 to 20 with their correct formulas in List II – A to T.
| List I | List II |
| 1. Copper [I] sulphide | A: KMnO4 |
| 2. Potassium permanganate | B: Mg3N2 |
| 3. Phosphoric acid | C: Mg(NO3)2 |
| 4. Copper [I] oxide | D: Al2(SO4)3 |
| 5. Carbonic acid | E: Na2ZnO2 |
| 6. Aluminium sulphide | F: N2O |
| 7. Iron [II] oxide | G: H2CO3 |
| 8. Iron [III] sulphide | H: Al2S3 |
| 9. Iron [II] sulphate | I: NO |
| 10. Sodium zincate | J: FeS |
| 11. Nitrous oxide | K: Fe2S3 |
| 12. Aluminium sulphate | L: H3PO4 |
| 13. Magnesium nitride | M: Cu2S |
| 14. Iron [III] sulphate | N: CuS |
| 15. Copper [II] oxide | O: Fe2O3 |
| 16. Iron [III] oxide | P: FeO |
| 17. Nitric oxide | Q: FeSO4 |
| 18. Copper [II] sulphide | R: Fe2(SO4)3 |
| 19. Iron [II] sulphide | S: CuO |
| 20. Magnesium nitrate | T: Cu2O |
