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- 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
- #Engineering
- #Class 11
- #Joint Entrance Examination Main
- #S - Block Elements (Alkali and Alkaline Earth Metals)
- #Chemistry
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
A is not correct but R is correct
Both A and R are correct but R is NOT the correct explanation of A
A is correct but R is not correct
Both A and R are correct and R is the correct explanation of A
Answers (1)
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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