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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
Give two examples of the following:
Solid + Liquid mixture
Match the metallic elements – with their correct symbols Metallic elements
| Metallic elements | Symbol |
| (a) Potassium | (1) Ca |
| (b) Sodium | (2) Zn |
| (c) Calcium | (3) Pb |
| (d) Magnesium | (4) Hg |
| (e) Zinc | (5) Cu |
| (f) Aluminum | (6) Au |
| (g) Iron | (7) K |
| (h) Lead | (8) Fe |
| (i) Copper | (9) Al |
| (j) Mercury | (10) Na |
| (k) Silver | (11) Mg |
| (l) Platinum | (12) Pt |
| (m) Gold | (13) Ag |
State what a chemical formula denotes.
Give the symbol and the number of atoms of the following elements present in water.
Give the symbol of the following element:
Lead
Give the symbol of the following element:
Iodine
State the valency of the following metallic element and write symbol with the valency
Zinc
State whether the following ion or radical given below of a non-metallic element exhibits valency: 1–, 2– or 3–. (write the ion or radical with the correct valency).
Nitrate
Describe the different ways in which we can write the symbols of elements. Give appropriate examples.
Antimony has the highest tensile strength.
