Answer : The wrong statement is, Two grams of hydrogen react with one gram of oxygen to form two grams of water.
Explanation :
Synthesis reaction : It is a type of reaction in which the reactants present in elemental state that reacts to give a single product.
It is represented as,
![X+Y\rightarrow XY](https://tex.z-dn.net/?f=X%2BY%5Crightarrow%20XY)
where, X and Y are the reactants and XY is the product.
The balanced synthesis reaction of water will be,
![2H_2+O_2\rightarrow 2H_2O](https://tex.z-dn.net/?f=2H_2%2BO_2%5Crightarrow%202H_2O)
By the stoichiometry we can say that, 2 moles of hydrogen
react with 1 mole of oxygen
to form 2 moles of water
as a single product.
Or we can say that,
2 molecules of hydrogen react with 1 molecule of oxygen to form 2 molecules of water.
Or,
2 liters of hydrogen react with 1 liter of oxygen to form 2 liters of water.
These three statements are correct.
But the statement, 2 grams of hydrogen react with 1 gram of oxygen to form 2 grams of water are incorrect statement.
Hence, the wrong statement is, Two grams of hydrogen react with one gram of oxygen to form two grams of water.