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प्रश्न
State which element exists in the highest percentage in earth’s crust.
उत्तर
Oxygen (O) – 46.1%
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संबंधित प्रश्न
Give two examples of the following :
Solid + Solid mixture
Explain the significance of the symbol H.
Give the symbol and the number of atoms of the following elements present in sodium chloride.
In the chemical word equation – Zinc + Sulphuric acid → Zinc sulphate + Hydrogen
The molecular equation is :
Zn + H2SO4 → ZnSO4 + H2[g].
State what [g] represents.
State which element exists in the highest percentage in atmosphere.
Give the symbol of the following element:
Oxygen
State the most reactive and the least reactive metal from the following – Zn, Ag, Na, Fe, Cu, Pb.
Write the radical of the following valency:
Sulphate
Write the radical of the following valency:
Calcium
Write the chemical formula of the following:
magnesium sulphate
