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प्रश्न
The atoms of which of the following pair of elements are most likely to exist in free state ?
विकल्प
hydrogen and helium
argon and carbon
neon and nitrogen
helium and neon
उत्तर
helium and neon
Atoms of helium and neon exist in a free state because they are inert gases and chemically inactive.
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संबंधित प्रश्न
Select elements and compounds from the following list: Iron, plaster of paris, chalk, common salt, copper, aluminium, calcium oxide, cane sugar, carbon, silica, sodium sulphate, uranium, potassium carbonate, silver, carbon dioxide.
Out of ozone, phosphorus, sulphur and krypton, the elements having the lowest and highest atomicities are respectively :
Give two examples of the following:
Liquid + Liquid mixture:
Give the symbol of the following element:
Arsenic
Give the symbol of the following element:
Antimony
Write the radical of the following valency:
Sulphur [Sulphide]
Write the chemical formula of the following:
Sodium bromide
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).
Bicarbonate
What is the expansion of IUPAC.
