Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason 
Assertion A: The alkali metals and their salts impart characteristic colour to reducing flame.
Reason R: Alkali metals can be detected using flame tests.
In the light of the above statements, choose the most appropriate answer from the options given below
is not correct but 
is correct
is correct but 
is not correct
and 
are correct and 
is the correct explanation of 
Text Solution
Verified by ExpertsA
The alkali metal and their salts impart characteristic colour to an oxidizing flame. this is because the heat from the flame excites the outemost orbital electron to a higher energy level : when the excited electron comes back to the ground state, there is emission of radiation in the visible region. Alkali metal can therefore, be detected by the respective flame test and can be determined by flame photometry or atomic absorption spectroscopy.
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