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प्रश्न
The pictorial symbol for water given by the alchemists was
विकल्प
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उत्तर
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संबंधित प्रश्न
The formula of the sulphate of an element X is X2(SO4)3. The formula of nitride of element X will be :
Match the formulas of the following of acids with their correct names:
Acids – (a) HCI (b) HNO3 (c) H2SO4 (d) H2CO3
Names – (1) Carbonic acid (2) Sulphuric acid (3) Hydrochloric acid (4) Nitric acid
Give the symbol of the following element:
Silicon
Give the symbol of the following element:
Hydroxide
State a reason why the symbol of calcium is ‘Ca’ and of copper is ‘Cu’
Give a reason – Magnesium [2, 8, 2] has valency 2+.
State the valency of the following metallic element and write symbol with the valency
Calcium
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).
Hydroxide
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).
Aluminate
Which letter is never used in any element symbol?
