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प्रश्न
State which element exists in the highest percentage in earth’s crust.
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उत्तर
Oxygen (O) – 46.1%
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संबंधित प्रश्न
The atomic number of an element X is 13. What will be the number of electrons in its ion X3+ ?
The formula of the sulphate of an element X is X2(SO4)3. The formula of nitride of element X will be :
Give the symbol and the number of atoms of the following elements present in water.
In the chemical word equation –
Zinc + Sulphuric acid → Zinc sulphate + Hydrogen.
State the reactants and products of the above reaction. What does the arrow indicate?
Give the symbol of the following element:
Oxygen
State the type of element for the following:
Zinc
State the type of element for the following:
Arsenic
Give the formula of the following acid:
Hydrochloric
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).
Permanganate
What does the symbol '⇌' present in a chemical equation, mean?
