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Q. Which among the following matches of ore and their metals are correct?
1. Limonite- Iron
2. Chalcopyrite- Copper
3. Bauxite- Aluminium
4. Monazite- Thorium
Choose the correct option from the codes given below :
Answer: 1, 2, 3 & 4
Notes: Limonite is an iron ore that is a mixture of hydrated iron (III) oxide-hydroxides.  Chalcopyrite is copper ore. Bauxite is an aluminium ore. Monazite is a primary ore of Thorium.

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