Consider the following statements: 1. The temporary hardness in water is due to the presence of bicarbonates of calcium. 2. The permanent hardness in water is due to the presence of soluble chlorides and sulphates of calcium and magnesium. 3. The permanent hardness in water is removed by adding Na₂CO₃ to water. Which of the statements given above are correct?

Consider the following statements regarding matter: 1. Elements cannot be broken down into simpler substances. 2. A compound has variable composition and can be broken down into elements. 3. The solu…

Consider the following : 1. Carbon dioxide 2. Oxides of Nitrogen 3. Oxides of Sulphur Which of the above is/are the emission/ emissions from coal combustion at thermal power plants?

Consider the following statements: Statement I: Studies indicate that carbon dioxide emissions from cement industry account for more than 5% of global carbon emissions. Statement II: Silica-bearing c…

Consider the following statements: Statement I: Activated carbon is a good and an attractive tool to remove pollutants from effluent streams and to remediate contaminants from various industries. Sta…

Which one of the following statements is not correct for benzene?