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An unidentified bivalent metal M reacts with an unidentified halogen X to form an unknown compound of halogen gas. When $1.12 g$ of it is heated, 0.72 g of MX is obtained along with 56 ml of halogen gas at 1 atm and 273 K. Identify the metal.

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answer is B.

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Detailed Solution

$\begin{array}{l} M + X_{2} \to M X_{2} \overset{Δ}{⟶} M X + \frac{1}{2} X_{2} \\ \frac{1.12}{M + 2 x} = \frac{0.72}{M + x} = \frac{56}{22400} \times 2 \end{array}$

Thus, an unidentified halogen Cu forms an unknown compound of halogen gas.

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