Which of the following carbonates decomposes at the highest temperature?
Correct answer: D. BaCO3
- A. MgCO3
- B. CaCO3
- C. SrCO3
- D. BaCO3
Explanation
The decomposition temperature of carbonates increases as you move down Group 2 in the periodic table. This is because the lattice energy and the stability of the carbonate ion increase with the size of the cation. Therefore, BaCO3 decomposes at the highest temperature among the given options. MgCO3 and CaCO3 decompose at lower temperatures because they have smaller cations, resulting in less stable carbonates compared to SrCO3 and BaCO3.
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About Periodic Properties and Trends
Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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