To determine which statement is incorrect, let's analyze each option one by one, focusing on the chemical reactions involved.
Examining Each Statement
Statement (a)
Br2 reacts with hot and strong NaOH solution to give NaBr and H2O. This statement is actually correct. When bromine reacts with sodium hydroxide, especially under hot conditions, it can lead to the formation of sodium bromide and water, along with other products depending on the reaction conditions.
Statement (b)
Ozone reacts with SO2 to give SO3. This statement is also accurate. Ozone (O3) can oxidize sulfur dioxide (SO2) to sulfur trioxide (SO3). This reaction is significant in atmospheric chemistry, particularly in the formation of acid rain.
Statement (c)
Silicon reacts with NaOH(aq) in the presence of air to give Na2SiO3 and H2O. This statement is correct as well. Silicon can react with sodium hydroxide in an aqueous solution, especially when oxygen is present, to form sodium silicate (Na2SiO3) and water.
Statement (d)
Cl2 reacts with excess of NH3 to give N2 and HCl. This statement is incorrect. When chlorine gas (Cl2) reacts with ammonia (NH3), it typically produces nitrogen trichloride (NCl3) and hydrochloric acid (HCl), rather than nitrogen gas (N2). The reaction can be complex, but the formation of N2 is not a common product under these conditions.
Conclusion
Based on the analysis, the incorrect statement is (d). The reaction of chlorine with ammonia does not yield nitrogen gas; instead, it leads to the formation of nitrogen trichloride and hydrochloric acid. Understanding these reactions is crucial for grasping the behavior of halogens and their interactions with various compounds.
