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(D) The flame test is used to identify the presence of certain metal ions in a sample based on the characteristic color they impart to a flame.Among t

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$4$

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(D) The flame test is used to identify the presence of certain metal ions in a sample based on the characteristic color they impart to a flame.Among the given ions,$Sr^{2+}$ (crimson red),$Ba^{2+}$ (apple green),$Ca^{2+}$ (brick red),and $Cu^{2+}$ (blue-green) show a positive flame test.$Zn^{2+}$,$Co^{2+}$,and $Fe^{2+}$ do not give a characteristic flame test.Therefore,the total number of metal ions that respond to the flame test is $4$.

Number of metal ions characterized by flame test among the following is $....$.
$Sr^{2+}, Ba^{2+}, Ca^{2+}, Cu^{2+}, Zn^{2+}, Co^{2+}, Fe^{2+}$

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Number of metal ions characterized by flame test among the following is $....$.$Sr^{2+}, Ba^{2+}, Ca^{2+}, Cu^{2+}, Zn^{2+}, Co^{2+}, Fe^{2+}$