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प्रश्न
Write down the formulae of sodium oxide.
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उत्तर
| Ions present | Formula |
 |
Na2O |
संबंधित प्रश्न
Write the chemical formula of the Copper nitrate.
Write down the formulae for the following compounds :
Magnesium hydroxide
If the valency of hydrogen is 1 and that of nitrogen is 3, work out the formula for ammonia.
Write the formula of the following compound:
Magnesium chloride
Write the formula of the following compound:
Iron [II] sulphate
Write the formula of the following compound:
Iron [III] sulphide
Write the formula of the following compound:
Lead [II] sulphate
State of the following formula of a compound is incorrect. Incorrectly write the correct formula.
BaCl2
What do you understand by chemical formula of a compound? What is its significance?
Complete the following crossword puzzle (Fig. 3.1) by using the name of the chemical elements. Use the data given in Table.
| Across | Down | ||
| 2 | The element used by Rutherford during his α–scattering experiment | 1 | A white lustrous metal used for making ornaments and which tends to get tarnished black in the presence of moist air |
| 3 | An element which forms rust on exposure to moist air | 4 | Both brass and bronze are alloys of the element |
| 5 | A very reactive non–metal stored under water | 6 | The metal which exists in the liquid state at room temperature |
| 6 | Zinc metal when treated with dilute hydrochloric acid produces a gas of this element which when tested with burning splinter produces a pop sound. | 8 | An element with symbol Pb |
