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प्रश्न
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 |

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उत्तर

| Across | Down | ||
| 2 | Gold | 1 | Silver |
| 3 | Iron | 4 | Copper |
| 5 | Phosphorus | 6 | Mercury |
| 7 | Hydrogen | 8 | Lead |
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संबंधित प्रश्न
Write the chemical formula of the Calcium carbonate.
Name the following compounds. Also write the symbols/formulae of the ions present in them :
- CuSO4
- (NH4)2SO4
- Na2O
- Na2CO3
- CaCl2
Identify the following substance:
An alkaline gas A which gives dense white fumes with hydrogen chloride.
Name the element in the compound and give the formula of the following compound:
Carbonic acid
Write the formula of the following compound:
Potassium dichromate
Write the formula of the following compound:
Sodium iodide
Write the formula of the following compound:
Sodium bisulphite
Write the formula of the following compound:
Zinc chloride
Write the formula of the following compound:
Iron [III] oxide
Define the term Relative atomic mass. State why indirect methods are utilised to determine the absolute mass of an atom. Explain in brief the indirect method used.
