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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
A student wants to have 3.011 × 1023 atoms each of magnesium and carbon elements. For this purpose, he will have to weigh :
Match the symbols of non-metallic elements with their correct combining power or capacity.
(a) O
(b) S
(c) Cl
Combining power or capacity A : 3; B : 2; C : 1. (negative valencies)
State the type of element for the following:
Chlorine
Give the symbol of the following element:
Magnesium
Write the chemical formula of the following:
Sodium bromide
Write the chemical formula of the following:
aluminium chloride
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
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).
Carbonate
What does the symbol '(l)' present in a chemical equation, mean?
