Wood has lower calorific value (~17 kJ/g) compared to coal (~25-35 kJ/g), methane (~55.5 kJ/g), and hydrogen (~142 kJ/g). It contains moisture and oxygen, reducing energy density.
Explanation:
Finely divided nickel catalyzes the addition of hydrogen to liquid oils to form solid fats (vanaspati ghee). Platinum/palladium also work but are expensive. Iron is used in Haber process; V₂O₅ in Contact process.
Explanation:
In a blast furnace, limestone (CaCO₃) decomposes to CaO, which acts as a basic flux. It reacts with the acidic impurity silica (SiO₂) to form calcium silicate slag (CaSiO₃), which is lighter and floats on top of the molten iron, allowing it to be separated and removed.
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