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Pyrolusite is......

Which of the following is an ore of magnesium?

$XCl_2 \text{ (excess)} + YCl_2 \to XCl_4 + Y \downarrow ;$
$YO \xrightarrow[> 400^oC]{\Delta} \frac{1}{2} O_2 + Y$. The ore of $Y$ would be:

The metal that is not extracted from its sulphide ore is:

The ore in which sulphide is absent :
$(I)$ Cuprite
$(II)$ Argentite
$(III)$ Pyrites
$(IV)$ Siderite

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