(C) $1$. Magnetite is $Fe_3O_4$,which is an oxide ore of iron,not manganese.$2$. Pyrolusite is $MnO_2$,which is an oxide ore of manganese,not lead.$3$

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Siderite is carbonate ore of iron

(C) $1$. Magnetite is $Fe_3O_4$,which is an oxide ore of iron,not manganese.$2$. Pyrolusite is $MnO_2$,which is an oxide ore of manganese,not lead.$3$. Siderite is $FeCO_3$,which is a carbonate ore of iron. This is a correct statement.$4$. $FeS_2$ is known as iron pyrites or fool's gold,not rolled gold. Rolled gold is an alloy of copper and aluminium.

Class 12 Chemistry General Principles and Processes of Isolation of Elements Occurrence

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A
Magnetite is an ore of manganese
B
Pyrolusite is an ore of lead
C
Siderite is carbonate ore of iron
D
$FeS_2$ is rolled gold

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General Principles and Processes of Isolation of Elements

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Occurrence

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

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The main ore of silver is .......

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The ore pitchblende is the main source of

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Which one of the following types of metals is expected to occur in the native state?

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Sphalerite,siderite,and malachite are the ores of metals $X$,$Y$,and $Z$ respectively. What are the atomic numbers of these metals?

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$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:

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Sphalerite,siderite,and malachite are the ores of metals $X$,$Y$,and $Z$ respectively. What are the atomic numbers of these metals?

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