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प्रश्न
Select the correct answer to the statement given below:
An element present in the earth’s crust, atmosphere and the human body.
पर्याय
Chalk
Oxygen
Silicon
Bromine
Nitrous oxide
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उत्तर
Oxygen
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संबंधित प्रश्न
Give the symbols and valencies of following radicals:
(a) Hydroxide (b) Chloride
(c) Carbonate (d) ammonium
(e) Nitrate
Give the symbol and the number of atoms of the following elements present in water.
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)
Give the symbol of the following element:
Sulphur [sulphide]
State the type of element for the following:
Aluminium
Write the chemical formula of the following:
calcium sulphide
Define the term ‘valency’.
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).
Bromide
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
Antimony has the highest tensile strength.
