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Those elements impart colour to the flame on heating in it, the atoms of which require low energy for the ionisation (i.e., absorb energy in the visible region of spectrum). The elements of which of the following groups will impart colour to the flame?

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answer is A, C.

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Detailed Solution

Alkaline earth metals of Group II and Group I are reactive metals with low ionisation enthalpies. Thus, the correct option is a and c.

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