Hydrogen peroxide is used as a bleaching agent because it:
A. Dehydrates the cloth
B. Absorbs light
C. Is a strong acid
D. Is a strong oxidizing agent
Answer: Option D
Solution (By JKExamLibrary)
H₂O₂ acts as an oxidizing agent, breaking down colored organic compounds into colorless products. It bleaches hair, textiles, and paper. It also acts as a disinfectant. It decomposes to water and oxygen, leaving no harmful residue, making it environmentally friendly.
Explanation:
Calorific value is the amount of heat energy produced on the complete combustion of 1 kg (or 1 m³ for gases) of a fuel. It is expressed in kJ/kg or kJ/m³. Hydrogen has the highest calorific value among common fuels, making it a highly efficient energy source.
Explanation:
Distilled water is considered the purest form of water because it is obtained by boiling water and condensing the steam, leaving almost all impurities, minerals, and salts behind. Rainwater is relatively pure but dissolves atmospheric gases and dust as it falls.
Explanation:
Smelting involves heating a metal oxide ore (roasted or calcined) with a reducing agent like coke (carbon) or CO to obtain the metal in the molten state. Example: Fe₂O₃ + 3CO → 2Fe + 3CO₂ in blast furnace. Calcination: heating carbonate/ hydroxide ore in absence of air. Roasting: heating sulfide ore in excess air. Leaching: chemical dissolution of ore. Smelting is a key pyrometallurgical step.
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