Problem 184 - A Complete Resource Book in Chemistry for JEE Main

Question

How many of these metals are usally used as catalysts \(\mathrm{Pd}, \mathrm{Pt}, \mathrm{Ni}, \mathrm{Na} / \operatorname{liq} \cdot \mathrm{NH}_{3}\)

Step-by-Step Solution

Answer

Three metals are used as catalysts: Pd, Pt, and Ni.

Step 1: Identify Known Catalytic Metals

Start by identifying which of the given metals are commonly known to act as catalysts. The metals in question are Palladium (Pd), Platinum (Pt), Nickel (Ni), and Sodium (Na). From chemical knowledge, Pd, Pt, and Ni are well-known for their catalytic properties.

Step 2: Analyze Non-catalytic Metal

Review the chemical properties of Sodium (Na). Sodium is not typically used as a catalyst in reactions since it is an active metal and reacts vigorously with many substances, such as water.

Step 3: Count Catalytic Metals

Having identified Palladium (Pd), Platinum (Pt), and Nickel (Ni) as catalytic metals, count them. In this case, the number of metals acting as catalysts is 3.

Key Concepts

Catalytic Properties of Metals

Metals as catalysts are a fascinating aspect of chemistry, especially due to their ability to speed up chemical reactions without being consumed in the process. Three metals, Palladium (Pd), Platinum (Pt), and Nickel (Ni), are renowned for their effective catalytic properties. These metals can provide a surface on which reactions can occur more efficiently.
Some key benefits of using metals as catalysts include:

• Increasing the rate of a chemical reaction, allowing it to proceed faster and requiring less energy.
• Improving the yield of products by providing more efficient reaction pathways.
• Being reusable in many cases because they do not get consumed in the reaction.

Each of these metals has unique characteristics that make them suitable for various reactions. For instance, Palladium is especially effective in hydrogenation reactions, while Platinum is often used in automotive catalytic converters to reduce harmful emissions. Nickel, on the other hand, is commonly utilized in industrial processes, such as the production of synthetic fuels.

Identification of Catalysts

Identifying catalysts involves understanding their roles and characteristics in chemical reactions. A catalyst is a substance that speeds up a reaction without being used up. This means that the catalyst remains unchanged at the end of the reaction, ready to be used again.
Here are some steps to identifying a catalyst in chemical processes:

• Look for substances that provide a surface or environment for the reaction to occur.
• Identify chemicals that are unchanged in the products of the reaction, implying they have facilitated without being consumed.
• Consider the known applications of substances; for example, metals like Pd, Pt, and Ni are often highlighted in textbooks and scientific literature for their catalytic roles.

By understanding these roles, chemists can leverage catalysts effectively in developing faster and more efficient chemical processes.

Chemical Reactions with Metals

In the realm of chemistry, metals play diverse roles, with their participation in chemical reactions being one of the most crucial. Metals like Palladium, Platinum, and Nickel are notable for their catalytic abilities. This means that during certain reactions, they can allow reactants to convert into products much faster than they normally would.
Here are a few ways metals function in chemical reactions:

• They can act as a conduit for electron transfer, which is critical in oxidation-reduction reactions.
• Metals provide specific sites where molecules can adsorb, orient themselves properly, and then react more easily.
• In hydrogenation, metals like Ni are essential in breaking hydrogen molecules into atoms so they can bond with carbon atoms, resulting in saturated hydrocarbons.

Understanding the behavior of metals in these processes is vital for optimizing industrial reactions and developing new chemical pathways.