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The following compounds have been arrang...

The following compounds have been arranged in order of their increasing stabilities. Identify the correct order.
(I) `K_(2)CO_(3)` (II) `MgCO_(3)`
(III) `CaCO_(3)` (IV) `BeCO_(3)`

A

`I lt II lt III lt IV`

B

`IV lt II lt III lt I`

C

`IV lt II lt I lt III`

D

`II lt IV lt III lt I`

Text Solution

Verified by Experts

The correct Answer is:
B
`BeCO_(3) lt MgCO_(3) lt CaCO_(3) lt K_(2)CO_(3)`
Alkali metal carbonates are stable than carbonates of alkaline earth meatals, and they do not decompose on heating and their stabilities increase down the group `(darr)`, therefore potassium carbonate is thermally most stable.
`MgCO_(3)overset(Delta)(rarr)MgO+CO_(2)`
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