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Characteristics of s- Block Elements

Na2 CO3 is th...

Question

$N a_{2} C O_{3}$ is thermally stable but $L i_{2} C O_{3}$ and $M g C O_{3}$ , both decompose on heating.
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Solution

Due to diagonal relationship, Li and Mg resemble. In general carbonates of first group elements are thermally stable but Lithium carbonate is not stable as it has diagonal relation with magnesium whose carbonate is not stable.

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Q. The most thermally stable compound out of

L i_{2} C O_{3}, M g C O_{3}

K_{2} C O_{3}

K_{2} C O_{3}

.
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L i_{2} C O_{3}

decomposes into

C O_{2}

L i_{2} O

but other alkali carbonates are thermally stable."
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L i_{2} C O_{3}

N a_{2} C O_{3}

are thermally stable."
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N a_{2} C O_{3}

is more thermally stable than

L i_{2} C O_{3}

."
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M g C O_{3}

is thermally more stable than

C a C O_{3}

.
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Characteristics of s- Block Elements

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