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Published on: 26/05/2021
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Questions + Answers key
Take MCQ Science Test1.
Point out any 3 differences between calcination and roasting.
2.
State five points of differences between ionic compound and covalent compound.
3.
What are 'mineral' and 'ore'?
4.
Why do covalent compounds have low melting point?
5.
Why do ionic compounds conduct electricity?
1.
| Calcination | Roasting | ||
| 1. | Heating the carbonate ore in the absence of oxygen is called calcination. | 1. | Heating the sulphide ores in the presence of oxygen is called roasting. |
| 2 | CO2 gas is evolved. | 2. | SO2 gas is evolved. |
| 3. | \({ ZnCO }_{ 3 }\underrightarrow { Heat } ZnO+{ CO }_{ 2 }\) | 3. | \(2ZnS+{ 3O }_{ 2 }\rightarrow ZnO+{ SO }_{ 2 }\) |
2.
| Ionic Compound | Covalent Compound | ||
| 1. | Ionic compounds contain ionic bond made up of ions. | 1. | Covalent compounds contain covalent bond made up of no ions. |
| 2. | Loss and gain of electrons takes place. | 2. | Sharing of electrons takes places. |
| 3 | Can conduct electricity. | 3. | Cannot conduct electricity. |
| 4. | Has high melting point. | 4. | Has low melting point. |
| 5. | Are soluble in water. | 5. | Are insoluble in water. |
3.
Mineral :
It is a naturally occurring substance which contains elements or compounds.
Ores :
Those minerals which contain a very large percentage of a particular metal and the metal can be extracted economically are called ores.
4.
Covalent compounds are made up of covalent bonds which are not strong enough and needs less heat energy to melt.
5.
Ionic compounds when in molten state allow the electricity to flow through it because it ionises to form positive and negative ions.
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