Please select a subject first
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Silver and copper are very good conductors of electricity.
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Metals have high melting points.
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Match the following
| i. | Softest metal | a. | Copper |
| ii. | Hardest metal | b. | Sodium |
| iii. | Hardest non–metal | c. | Osmium |
| iv. | Ductility | d. | Diamond |
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Match the following
| i. | Silica | a. | Caustic potash |
| ii. | Potassium hydroxide | b. | Sand |
| iii. | Sodium hydroxide | c. | Calamine |
| iv. | Zinc carbonate | d. | Caustic soda |
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Which metal has the highest ductility?
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Why do metals appear shiny?
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Which metals are not solid at room temperature?
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Which metals are liquid at room temperature?
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Why are metalloids called semimetals?
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Compare the conductivity of metals and non–metals.
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The process of adding chlorine in adequate amounts to water is called ______.
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______ from the air and sunlight destroy the germs present in water.
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Washing soda is used to remove permanent hardness of water.
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Temporary and permanent hardness can be removed by the method of boiling.
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Match the following:
| 1. | The density of pure water | a. | Inflammable air |
| 2. | Henry Cavendish | b. | Cathode |
| 3. | Hydrogen | c. | 1 g/cm3 |
| 4. | Negative carbon electrode | d. | Hydrogen |
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Name the chemical which converts chlorides and sulphates into insoluble carbonates.
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Which of the following is not a natural indicator?
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Add a few drops of hibiscus indicator to the soap solution. What do you observe?
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Acids and bases can be identified in the laboratory by ______.
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