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Question

Which property of an element is not variable?

A
Valency
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B
Atomic mass
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C
Equivalent mass
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D
None of these
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Solution

The correct option is B Atomic mass
Valency of an element can be variable as in transition metals, Cu+,Cu+2.
Also, Equivalent mass =molarmassvalency. So, it is also variable as valency is variable.
But, Atomic mass of an element is constant as it is the mass of total particles of element (proton, neutron and electron).

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