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Question

Analyse the reaction given below:

CaCO3(aq) + H2O(aq) + CO2(g) Ca(HCO3)2(aq)

If X is the total number of oxygen atoms and Y is the total number of carbon atoms present in the chemical reaction after balancing, then determine X + Y.

A
9
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B
12
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C
16
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D
8
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Solution

The correct option is D 8

If we count the number of atoms for the given chemical reaction then we have:

Reactants Products
Elements No. of atoms Elements No. of atoms
Ca 1 Ca 1
C 2 C 2
H 2 H 2
O 6 O 6

The total number of electrons are already balanced on both sides of the chemical equation. Hence, the given chemical equation is already balanced. The value of X is 6 and Y is 2. Therefore, the value of X + Y is 8.

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