A reaction involving carbon dioxide causes the cloudiness in the limewaterPlace crosses ( ) in two boxes to show the correct statements about this reaction. carbon dioxide forms when the hydrogen burns carbon dioxide from the air reacts to cause the cloudiness the cloudiness is caused by the formation of calcium hydroxide the cloudiness is caused by the formation of a white precipitate the reaction in the limewater is an example of oxidation

The correct statements about this reaction are:

 Carbon dioxide from the air reacts to cause the cloudiness. This is because when carbon dioxide gas is bubbled through limewater (a solution of calcium hydroxide), it reacts to form calcium carbonate, which is insoluble and forms a white precipitate, causing the solution to turn cloudy.

 The cloudiness is caused by the formation of a white precipitate. As mentioned above, the white precipitate is calcium carbonate, which is formed when carbon dioxide reacts with the calcium hydroxide in the limewater.

The other statements are incorrect:

Carbon dioxide does not form when hydrogen burns. When hydrogen burns in the presence of oxygen, the product is water (H2O), not carbon dioxide (CO2).

The cloudiness is not caused by the formation of calcium hydroxide. In fact, the limewater is initially a solution of calcium hydroxide. It's the reaction of this with carbon dioxide that causes the cloudiness.

The reaction in the limewater is not an example of oxidation. Oxidation involves the loss of electrons, but in this reaction, there's no transfer of electrons. Instead, it's an example of a precipitation reaction, where a solid (the precipitate) forms from the reaction of two solutions.