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प्रश्न
Write down the formulae for the following compounds :
Calcium oxide
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उत्तर
Calcium oxide: CaO
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संबंधित प्रश्न
What do the following abbreviations stand for ?
- O
- 2O
- O2
- 3O2
Name the following compounds. Also write the symbols/formulae of the ions present in them :
- CuSO4
- (NH4)2SO4
- Na2O
- Na2CO3
- CaCl2
Give the formula and valency of:
| Aluminate | ______ | ______ |
What is a chemical formula? What is the significance of a formula?give an example to illustrate?
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State of the following formula of a compound is incorrect. Incorrectly write the correct formula.
NaClO
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 |
