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प्रश्न
Complete the statement with the correct words.
__________ are chemicals formed on reaction of a base with an _____ giving salt and water.
उत्तर
Salts are chemicals formed on reaction of a base with an acid giving salt and water.
संबंधित प्रश्न
Define: Compounds
Name: an Inert Gas
Give two examples of Metalloids.
Give reason: Graphite is used to make a lead of the pencils.
Indicate whether the following statement is true or false:
All elements are artificially prepared
The important physical properties of substances are colour, odour, nature, density & solubility in water.
Name – a gas with a pungent, choking odour which is lighter than air
Match the separation of components in List I with the most appropriate process in List II.
| List I | List II |
| 1. Naphthalene from naphthalene & sodium chloride. | A: Separating funnel |
| 2. Cream from milk. | B: Sublimation |
| 3. Kerosene oil from kerosene oil & water. | C: Boiling |
| 4. Lead nitrate from an aqueous solution of lead nitrate. | D: Centrifugation |
| 5. Ammonia from an aqueous solution of ammonia. | E: Distillation |
Give an example for the elements derived from their Latin names.
Match the following:
| 1. | Co2 | a. | Robert Boyle |
| 2. | Sulfur | b. | Making mobile phones |
| 3. | Element | c. | triatomic molecule |
| 4. | Gallium | d. | Polyatomic molecule |
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal which is required for combustion.
