What is the formula of zinc blende?

• (A) ZnO
• (B) Zns
• (C) Zn₂S
• (D) none of these

The formula for zinc blende is actually represented as ZnS, which corresponds to option (B) in your list. Zinc blende, also known as sphalerite, is a mineral composed of zinc sulfide. Let's delve a bit deeper into what this means and why ZnS is the correct answer.

Understanding Zinc Blende

Zinc blende is a significant ore of zinc and is characterized by its cubic crystal structure. The name "blende" comes from the German word "blenden," which means "to deceive," referring to its resemblance to other minerals that contain lead or silver.

Chemical Composition

The chemical formula ZnS indicates that each formula unit consists of one zinc (Zn) atom and one sulfur (S) atom. This 1:1 ratio is crucial for the stability of the mineral's structure.

• Zinc (Zn): A transition metal that is essential for various biological functions and is widely used in galvanizing steel to prevent rust.
• Sulfur (S): A non-metal that plays a vital role in the formation of proteins and is found in many minerals.

Crystal Structure

Zinc blende crystallizes in the cubic system, which means it has a symmetrical shape that contributes to its physical properties. The arrangement of atoms in this structure allows for efficient packing, which is a key factor in the mineral's stability and hardness.

Why Other Options Are Incorrect

Now, let's briefly examine the other options you provided:

• ZnO (Option A): This is zinc oxide, a different compound that consists of zinc and oxygen, not sulfur.
• Zn2S (Option C): This formula suggests a different stoichiometry, indicating two zinc atoms for every sulfur atom, which does not represent zinc blende.
• None of these (Option D): Since we have established that ZnS is indeed the correct formula, this option is also incorrect.

Applications of Zinc Blende

Zinc blende is not just a mineral of academic interest; it has practical applications as well. The zinc extracted from this mineral is used in various industries, including:

• Galvanization of steel to prevent corrosion.
• Production of alloys and batteries.
• Manufacturing of rubber and paints.

In summary, the correct answer to your question is (B) ZnS, which represents zinc blende. Understanding its composition and properties can provide insights into its significance in both geology and industry.