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Chemistry: Post your doubts here!

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Reaction score
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The answer is B.
When heated strongly, both carbonates will decompose into their respective oxides and carbon dioxide.

Option 1: Magnesium oxide is a well-known refractory material. This is correct.
Option 2: Both oxides are basic, so they will react with acidic impurities. This is correct.
Option 3: Metallic oxides do not react with each other in redox reactions. The cations present are Ca2+ and Mg2+. To reduce others these cations must get oxidised. There are no such cations asCa3+ or Ca4+, so these cations cannot be oxidised. This is incorrect.

Therefore, the answer is B.
 
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How is 3 also correct?
V3+ = 20 electrons = 1s2 2s2 2p6 3s2 3p6 4s2 ... so it doesn't have unpaired electrons :/
 
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