Carbon Allotropes

Step 1: Understanding Allotropes of Carbon and Their Uses - Graphite: Graphite is widely used in the manufacturing of crucibles, which are used for melting metals, due to its high melting point and good conductivity. This makes statement (i) true. - Activated Charcoal: Activated charcoal is commonly used in water filtration processes because of its high surface area and its ability to adsorb impurities. This makes statement (ii) true. - Carbon Black: Carbon black is a fine powder used primarily as a fuel and also as a reinforcement agent in rubber products like tires. This makes statement (iii) true.
Step 2: Conclusion 1st and 2nd statement is correct, so the correct answer is (i, ii only).