Question

Calcium carbonate decomposes to calcium oxide and carbon dioxide. The valency of calcium ion in calcium oxide and oxygen in sodium oxide are: (a) 2 and 2 (b) 1 and 2 (c) 2 and 1 (d) 1 and 1

Answer 1

Answer:

Calcium carbonate will decompose to form carbon dioxide and calcium oxide.

Carbonate compounds will decompose when heated.

Here is the balanced equation for this reaction:

C

a

C

O

3

(s) -> CaO(s) +

C

O

2

(g)

Calcium carbonate has a 1:1 ratio because calcium forms a +2 ion and carbonate has a -2 charge.

Calcium oxide must have the formula CaO because calcium forms an ion with a +2 charge and oxide has a -2 charge.

Explanation:

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