JEE Main Chemistry question

Chemistry General Principles and Processes of Isolation of Elements (Metallurgy)JEE Main

Not in JEE Main or NEET syllabus

Calcination can be employed for how many of the following ores?

Limonite, siderite, zincite, zinc blende, calamine, cryolite, wolframite, cassiterite

Answer: 3

Solution

Calcination applies to carbonate and hydrated-oxide ores: limonite (hydrated iron oxide), siderite () and calamine () qualify, giving 3. Zincite and wolframite are already simple

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Question ID VK-145601