The following compounds have been arranged in the order of their increasing thermal stabilites. Identify the correct order.
$K_{2} C O_{3} (I), N a_{2} C O_{3} (I I), R b_{2} C O_{3} (I I I), L i_{2} C O_{3} (I V)$

I < I I < I I I < I V

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I V < I I < I I I < I

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I V < I I < I < I I I

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I I < I V < I I I < I

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Solution

The correct option is D $I V < I I < I < I I I$
Thermal stability of alkali metal carbonates increases as we move down the group because the cation size increases and bigger size cation stabilizes bigger size anion by lattice energy effects.
Hence the order will be $4 < 2 < 1 < 3$

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The following compounds have been arranged in the order of their increasing thermal stabilites. Identify the correct order.K2CO3(I),Na2CO3(II),Rb2CO3(III),Li2CO3(IV)

The correct option is D IV<II<I<IIIThermal stability of alkali metal carbonates increases as we move down the group because the cation size increases and bigger size cation stabilizes bigger size anion by lattice energy effects.Hence the order will be 4<2<1<3

The following compounds have been arranged in the order of their increasing thermal stabilites. Identify the correct order.
$K_{2} C O_{3} (I), N a_{2} C O_{3} (I I), R b_{2} C O_{3} (I I I), L i_{2} C O_{3} (I V)$

The correct option is D $I V < I I < I < I I I$
Thermal stability of alkali metal carbonates increases as we move down the group because the cation size increases and bigger size cation stabilizes bigger size anion by lattice energy effects.
Hence the order will be $4 < 2 < 1 < 3$