Question

The decomposition temperatures of alkaline earth metal carbonates are given below,

$BeC{O}_{3}MgC{O}_{3}CaC{O}_{3}SrC{O}_{3}BaC{O}_3,<{100}^{o}C<...<{900}^{o}C<...<{1300}^{o}C$.

The decomposition temperatures of $MgC{O}_3$ and $SrC{O}_3$ are respectively :

• A. ${1290}^{o}C,{1200}^{o}C$
• B. ${1290}^{o}C,{540}^{o}C$
• C. ${540}^{o}C,{1290}^{o}C$
• D. ${540}^{o}C,{800}^{o}C$

Answer 1

The correct option is C ${540}^{o}C,{1290}^{o}C$

The decomposition temperatures of alkaline earth metal carbonates is approximated as $<{100}^{o}C$ for $BeC{O}_3$, ${540}^{o}C$ for $MgC{O}_3$, ${900}^{o}C$ for $CaC{O}_3$, ${1290}^{o}C$ for $SrC{O}_3$ and ${1360}^{o}C$ for $BaC{O}_3$.

$MgC{O}_3$ = ${540}^{0}C$

$SrC{O}_3$ = ${1290}^{0}C$

Hence,option C is correct.