JEE Main · 2012 · 29 Apr 2012 · Offline · s-Block Elements

Which of the following on thermal decomposition yields a basic as well as an acidic oxide ?

(A) $NaNO_{3}$
(B) $KCIO_{3}$
(C) $CaCO_{3}$ ✓ Correct
(D) $NH_{4} NO_{3}$

Answer: (C)

Solution

On heating, calcium carbonate breaks up as

CaC O_{3} \to CaO + C O_{2}

. The solid left behind,

CaO

, is a metal oxide and therefore basic, while the gas driven off,

C O_{2}

, is a non-metal oxide and therefore acidic. A single decomposition thus yields both a basic and an acidic oxide, which the nitrate, chlorate and ammonium-nitrate options do not.

JEE Main · 2012 · 29 Apr 2012 · Offline · Single correct option

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