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प्रश्न
Define Alchemy.
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उत्तर
Alchemy was a form of chemistry studied in the middle age, which was concerned with trying to discover ways to change ordinary metals into gold.
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संबंधित प्रश्न
Match the non-metallic elements – with their correct symbols. Non-metallic elements are:
| Non-Metallic elements | Symbol |
| (a) Carbon | (1) O |
| (b) Chlorine | (2) I |
| (c) Oxygen | (3) Si |
| (d) Phosphorus | (4) C |
| (e) Hydrogen | (5) Cl |
| (f) Nitrogen | (6) P |
| (g) Iodine | (7) F |
| (h) Bromine | (8) H |
| (i) Fluorine | (9) S |
| (j) Silicon | (10) Br |
| (k) Sulphur | (11) N |
State the type of element for the following:
Oxygen
State the type of element for the following:
Arsenic
State the type of element for the following:
Phosphorus
Give the symbol of the following element:
Magnesium
Write the radical of the following valency:
Phosphate
State a reason why the symbol of calcium is ‘Ca’ and of copper is ‘Cu’
State the valency of the following metallic element and write symbol with the valency
Sodium
What does the symbol '(aq.)' present in a chemical equation, mean?
In the same way in chemistry, each element is denoted by a ______.
