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Comment on the following statements:
Sponge though compressible is a solid.
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Which of the following represents a correct chemical formula? Name it.
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Which of the following represents a correct chemical formula? Name it.
BiPO4
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Write the molecular formulae for the following compounds
Copper (II) bromide
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Write the molecular formulae for the following compounds
Aluminium (III) nitrate
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Write the molecular formulae for the following compounds
Calcium (II) phosphate
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Write the molecular formulae for the following compounds
Iron (III) sulphide
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Write the molecular formulae for the following compounds
Mercury (II) chloride
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Write the molecular formulae for the following compounds
Magnesium (II) acetate
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Write the molecular formulae of all the compounds that can be formed by the combination of the following ions
Cu2+, Na+, Fe3+, C1– , `"SO"_4^-2`, `"PO"_4^3-`
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Give the chemical formulae for the following compounds and compute the ratio by mass of the combining elements in each one of them. (You may use appendix-III).
- Ammonia
- Carbon monoxide
- (Hydrogen chloride
- Aluminium fluoride
- Magnesium sulphide
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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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Which of the tubes in Fig. 2.1 (a) and (b) will be more effective as a condenser in the distillation apparatus?
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Find out the wrong statement from the following
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Which one of the following fish is a surface feeder?
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Preventive and control measures adopted for the storage of grains include
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Farming without the use of chemicals such as fertilizers, herbicides and pesticides is known as ______.
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Differentiate between the following
Capture fishery and Culture fishery
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Give the merits and demerits of fish culture?
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What do you understand by composite fish culture?
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