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Which of the following is not an ore of zinc?

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Which of the following is not an ore of zinc?

(a) Limonite

(b) Zincite

(c) Calamine

(d) Franklinite

I got this question in examination.

This interesting question is from Non-Ferrous Metals and Alloys topic in portion Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials

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The correct choice is (a) Limonite

The explanation is: The principle ores of zinc are zincite, franklinite, zinc blende and calamine. Zinc is used in the process of galvanization. It is also used in electric cells and in the preparation of alloys.

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