The correct sequence of thermal stability of the following carbonates is: 

  • Option 1)

    MgCO_{3}< CaCO_{3}< SrCO_{3}< BaCO_{3}

  • Option 2)

    BaCO_{3}< SrCO_{3}< CaCO_{3}< MgCO_{3}

  • Option 3)

    MgCO_{3}< SrCO_{3}< CaCO_{3}< BaCO_{3}

     

  • Option 4)

    BaCO_{3}< CaCO_{3}<SrCO_{3}< MgCO_{3}

Answers (1)

 

Nature of carbonates of alkaline earth metals -

Insoluble in neutral medium but soluble in acid medium thermal stability

BaCO_{3}>SrCO_{3}>CaCo_{3}>MgCO_{3}

-

 

Reaction of carbonate of alkaline earth metals on heating -

Decompose to give CO_{2} and oxide

- wherein

MgCO_{3}\xrightarrow{\Delta } MgO+O_{2}

 

 

 

Formation of carbonates of alkaline earth metals -

When CO_{2} is passed through solution of alkaline metal hydroxides

- wherein

M(OH){_2}(aq.) + CO{_2}(g)\rightarrow MCO{_3}(s)+H{_2} O (l)

 

 

 

Thermal stability of carbonates increases in a group as we move from top to bottom & decreases in a period as we move from left to right.

\rightarrowDown the group, polarizing power of cation decreases, thus bond is more ionic & thus thermal stability increases. 

\therefore MgCO_{3}< CaCO_{3}< SrCO_{3}< BaCO_{3}


Option 1)

MgCO_{3}< CaCO_{3}< SrCO_{3}< BaCO_{3}

Option 2)

BaCO_{3}< SrCO_{3}< CaCO_{3}< MgCO_{3}

Option 3)

MgCO_{3}< SrCO_{3}< CaCO_{3}< BaCO_{3}

 

Option 4)

BaCO_{3}< CaCO_{3}<SrCO_{3}< MgCO_{3}

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