There are 2 Ca, 4 H (2*2) and 4 O (2+2) on the left hand side. So there should be the same number of atoms 2Ca and 4(O+H) on the right hand side. The reaction is a synthesis (making something new), rather than a decomposition (destroying something).
The answer is Two molecules of Ca(OH)2 should be produced during the synthesis reaction.
The statement that explains the equation is not balanced is option-D. Two molecules of [tex]\rm \bold{ Ca(OH)_2}[/tex] should be produced during the synthesis reaction.
The balanced equation is,
[tex]\rm \bold{ 2CaO + 2H_2O \rightarrow 2Ca(OH)_2}[/tex]
Here, 2 molecules of CaO react with 2 molecules of water to synthesize 2 molecules 2 molecules of Calcium hydroxide.
Hence option A, B and C can be eliminated.
Therefore, the statement that explains the equation is not balanced is option-D. Two molecules of [tex]\rm \bold{ Ca(OH)_2}[/tex] should be produced during the synthesis reaction.
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