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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:
Liquid + Liquid mixture:
Explain the terms ‘chemical formula’.
Give the symbol of the following element:
Sulphur [sulphide]
State the type of element for the following:
Oxygen
State the valency of the following metallic element and write symbol with the valency
Aluminium
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).
Bisulphate
Describe the different ways in which we can write the symbols of elements. Give appropriate examples.
The first letter of a symbol is always written as a ______ letter and the second letter as a ______ letter.
In the same way in chemistry, each element is denoted by a ______.
What is the rarest natural element on the earth?
