Question 1

Which chemical is commonly used as a rodenticide to control rats and mice?

Accepted Answer

Zinc Phosphide. Zinc Phosphide is highly toxic and serves as a common rodenticide. When ingested, it reacts with stomach acid to release poisonous phosphine gas. It is typically formulated as bait mixed with food grains.

Question 2

What is the primary chemical component of common glass used in windows?

Accepted Answer

Silicon Dioxide. Silicon dioxide is the main constituent of glass, making up about seventy percent of its composition. It is sourced from high-quality sand during the manufacturing process. Other chemicals are added to lower the melting point and improve durability.

Question 3

Which chemical is used to give a yellow color to firework displays?

Accepted Answer

Sodium salts. Sodium salts emit a very bright and distinct yellow light when heated in a flame. This occurs due to the excitation of electrons that release energy as visible light. In contrast, strontium is used for red and barium for green effects.

Question 4

Which substance is added to LPG cylinders to detect gas leaks through its smell?

Accepted Answer

Ethyl Mercaptan. Ethyl Mercaptan is a strong-smelling sulfur compound added to otherwise odorless fuel gases. It allows for the immediate detection of hazardous leaks in domestic kitchens. Only a very small concentration is required to produce a noticeable scent.

Question 5

Which chemical is widely used as a permanent ink for marking fingers during elections?

Accepted Answer

Silver Nitrate. Silver nitrate reacts with the skin's proteins to form a dark, water-insoluble stain. The mark cannot be easily washed off and only fades as skin cells naturally shed. It is light-sensitive and stored in dark bottles to prevent decomposition.

Everyday Chemistry — Set 1