A) \[BeC{{O}_{3}}\]
B) \[MgC{{O}_{3}}\]
C) \[SrC{{O}_{3}}\]
D) \[BaC{{O}_{3}}\]
Correct Answer: A
Solution :
The thermal stability of alkaline earth metal carbonates increases down the group. Hence, decomposition temperature is lowest for\[BeC{{o}_{3}}\]. \[\underset{523\text{ }K}{\mathop{BeC{{o}_{3}}}}\,<\underset{813\text{ }K}{\mathop{MgC{{O}_{3}}}}\,<\underset{1173\text{ }K}{\mathop{CaC{{O}_{3}}}}\,<\underset{1562K}{\mathop{SrC{{O}_{3}}}}\,<\underset{1633\text{ }K}{\mathop{BaC{{O}_{3}}}}\,\]
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