Question:
\(Al_2(SO_4)_3\) is used in the following but not
\(Al_2(SO_4)_3\) is used in the following but not
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Remember: Aluminum sulfate = Water, Paper, and Fabric. It is rarely associated with synthetic polymer/plastic production.
Updated On: Apr 29, 2026
- As a coagulant in treating drinking water and sewage
- In plastics industry
- As a mordant in dyeing
- In paper industry
- Both (C) and (D)
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Concept:
Aluminum sulfate, often called "alum" in industry, is a versatile chemical used primarily for its ability to cause particles to clump together (flocculation) and its acidic properties.
Step 1: Analyze common industrial uses.
• Water Treatment: It is a primary coagulant. It neutralizes the negative charge on particles, allowing them to settle out of water.
• Paper Industry: It is used as a "paper sizer." It helps in binding fibers and adjusting the pH of the pulp.
• Dyeing: It acts as a mordant, which is a substance that helps dyes "stick" to fabrics by forming an insoluble colored compound.
Step 2: Identify the incorrect use.
The plastics industry primarily relies on organic polymers, catalysts (like Ziegler-Natta), and specific additives like plasticizers. Aluminum sulfate does not play a significant or standard role in the manufacture or processing of plastics.
Step 1: Analyze common industrial uses.
• Water Treatment: It is a primary coagulant. It neutralizes the negative charge on particles, allowing them to settle out of water.
• Paper Industry: It is used as a "paper sizer." It helps in binding fibers and adjusting the pH of the pulp.
• Dyeing: It acts as a mordant, which is a substance that helps dyes "stick" to fabrics by forming an insoluble colored compound.
Step 2: Identify the incorrect use.
The plastics industry primarily relies on organic polymers, catalysts (like Ziegler-Natta), and specific additives like plasticizers. Aluminum sulfate does not play a significant or standard role in the manufacture or processing of plastics.
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