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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
The Latin language name of an element is natrium. The English name of this element is :
The formula of the sulphate of an element M is M2(SO4)3
Write the formula of it
Phosphate
Fill in the blank:
Symbol represents _____ atom(s) of an element.
Match the noble gases – with their correct symbols:
| Noble gases | Symbols |
| (a) Helium | (1) Ar |
| (b) Neon | (2) Xe |
| (c) Argon | (3) Rn |
| (d) Krypton | (4) He |
| (e) Xenon | (5) Kr |
| (f) Radon | (6) Ne |
Elements are mainly classified into metals and non-metals. State six properties of metals which differ from non-metals.
Give the symbol of the following element:
Sulphate
Give the formula of the following gas:
Nitrous oxide
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).
Bisulphite
What does the symbol '(l)' present in a chemical equation, mean?
The pictorial symbol for water given by the alchemists was
