(B) An alloy is a homogeneous mixture of two or more metals,or a metal and a non-metal.$A$. Copper $(Cu)$ is a pure chemical element.$B$. Brass is an

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(B) An alloy is a homogeneous mixture of two or more metals,or a metal and a non-metal.$A$. Copper $(Cu)$ is a pure chemical element.$B$. Brass is an alloy consisting of copper $(Cu)$ and zinc $(Zn)$.$C$. Chromium $(Cr)$ is a pure chemical element.$D$. Magnesium $(Mg)$ is a pure chemical element.Therefore,the correct answer is $B$.