Catalyst | MCQs

Explanation

A catalyst is a substance that speeds up a chemical reaction without being consumed or altered.

Catalysts increase the rate of reaction by lowering the activation energy required for the reaction to occur.

Explanation

A catalyst speeds up a chemical reaction without being consumed in the process.

It lowers the activation energy, allowing the reaction to occur faster.

Explanation

Enzymes act as biological catalysts, speeding up chemical reactions in the body without being consumed in the process.

They are essential for various physiological processes, including digestion and metabolism.

Explanation

Nickel is used as a catalyst in the hydrogenation process that converts vegetable oils into solid fat (banaspati ghee).

It helps in adding hydrogen to unsaturated fats, making them saturated and solid at room temperature.

Explanation

Explanation

Electrolysis, which uses electricity as a catalyst, is the process of separating water (H2O) into oxygen (O2) and hydrogen (H2).

When an electric current is passed through water, it causes the water molecules to split into their component gases.

Explanation

Raney nickel is prepared by treating a nickel-aluminum (Ni-Al) alloy with concentrated NaOH.

This process removes aluminum, leaving behind porous nickel, which acts as an excellent hydrogenation catalyst.

Explanation

Raney nickel is prepared by treating a nickel-aluminum alloy with a concentrated solution of sodium hydroxide.

This process, also known as activation, dissolves much of the aluminum, leaving behind a porous, highly active nickel catalyst. 

Explanation

• Carbonic anhydrase is a enzyme that catalyzes the conversion of carbon dioxide and water into carbonic acid, and it is considered one of the most efficient enzymes known, with a rate enhancement of up to 10^6 (1 million) times compared to the uncatalyzed reaction.
• Carbonic anhydrase is an excellent example of an enzyme that has evolved to optimize its catalytic activity, and its active site is specifically designed to bind substrates and facilitate the reaction.

Explanation

The catalyst in Friedel-Crafts alkylation is AlCl3 (aluminum chloride).