Advertisements
Advertisements
प्रश्न
Answer the following question:
When iron is mixed with sulphur at room temperature, it does not form a compound. Why?
Advertisements
उत्तर
When iron is mixed with sulphur at room temperature, it does not form a compound because the mixture of iron and sulphur requires heat to form a compound i.e. iron sulphide.
APPEARS IN
संबंधित प्रश्न
Define: Elements
Give one use of the following substance:
Coal
Indicate whether the following statement is true or false:
Metals can be polished.
Indicate whether the following statement is true or false:
All elements are artificially prepared
Tick (√) the correct alternative from the choice given for the following statement.
Gold is used to make jewellery because
Write the names of elements from the following symbol:
Fe
Give an example of two liquids that form heterogeneous mixtures.
Higher Order Thinking Skills.
List out the metals, non-metals and metalloids which you use in your house, schools. Compare their properties.
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 other than carbon that shows allotropy.
