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Q.

Among the following cations, the ones which does not give flame test are ___.
$B a^{+ 2}, L i^{+}, C a^{+ 2}, K^{+}, N a^{+}, M g^{+ 2}, B e^{+ 2}$

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answer is 2.

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Detailed Solution

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$M g^{+ 2}, B e^{+ 2}$

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