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प्रश्न
Define Alchemy.
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:
Match the symbols of metallic elements – with their correct combining power or capacity.
(a) K
(b) Zn
(c) Al
(d) Na
(e) Ca
Combining power or capacity – A : 3 ; B : 2 ; C : 1. (positive valencies)
State which element exists in the highest percentage in earth’s crust.
Give the symbol of the following element:
Potassium
Give the symbol of the following element:
Oxygen
Give the symbol of the following element:
Lead
State the type of element for the following:
Calcium
Give the formula of the following acid:
Nitric
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).
Permanganate
What does the symbol '(aq.)' present in a chemical equation, mean?
