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Q.

Which of the following metals cannot give flame tests?

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a

Ca

b

Na

c

Be

d

K

answer is A.

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Detailed Solution

During flame test, the electrons are excited to higher energy levels and when they drop back to the ground state, energy is emitted in the form of visible light. The electrons in Be and Mg are too strongly bound to get excited by flame. Hence, these elements do not impart any color to the flame.

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Which of the following metals cannot give flame tests?