The amount of heat absorbed or released to change the state of a unit mass of a substance, without changing its temperature, is called the latent heat of that substance of that state. The unit of latent heat in the CGS system is calories/gram. The SI unit of latent heat is joule/kg. Difference Between Latent […]
What are Primary colours? Answer: Any colour can be created by mixing these three colours – red, green and blue in appropriate amounts. But, these three colours cannot be created from any other colour. So these three colours of the spectrum are called primary or basic colours.
Name an air pollutant obtained by boiling copper with H2SO4 Answer: Boiling copper with concentrated sulfuric acid produces Sulfur dioxide, which is an air pollutant. Cu + 2H2SO4 = CuSO4 + SO2 ↑ + 2H2O
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Sulfuric acid is a strong oxidizing agent—Proof: When hydrobromic acid is heated in a test tube with concentrated H2SO4, red bromine gas is released. By this, H2SO4 oxidizes hydrobromic acid to liberate bromine. 2HBr + H2SO4 = Br2 + SO2 + 2H2O
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Sulfuric acid is a strong hygroscopic substance – Proof: When concentrated H2SO4 is added to sugar, the H2SO4 absorbs all the water content of the sugar and the sugar turns into black carbon. C12H22O11 + Conc. H2SO4 = 12C + [11H2O + H2SO4 ] This shows that sulfuric acid is a very strong hygroscopic substance.
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Sulfuric Acid Detection A white precipitate of barium sulphate is formed when barium chloride solution is added to a test tube with concentrated or dilute H2SO4. This precipitate is insoluble in HCl or HNO3. Sulfuric acid is detected by this test. H2SO4 + BaCl2 = BaSO4 ↓ + 2HCl Sulfuric acid does not react with
SO2 gas reacts with atmospheric oxygen, water vapour etc. to form sulfuric acid. Sulfuric acid is strongly acidic in nature and harmful to living organisms. It comes down to the surface through acid rain and causes damage. Harmful Effects of Sulfur Dioxide Pollution (i) Eye irritation and respiratory tract damage in presence of SO2. (ii)
Energy can be transformed from one form to another. This change in form of energy is called Energy Transformation. Example: In a steam engine, coal is burnt to generate steam and the engine runs on that steam. In this case, the chemical energy is first converted into thermal energy by burning coal. Then the generated
The ability to do work is called energy. The most of activities in contemporary life require energy. For comfort and convenience, we consume energy in the form of fossil fuels, electricity, and firewood. Different forms of energy are discussed below. Different forms of Energy There are different forms of energy. 1. Mechanical Energy The ability
