Question

In which one of the following situations a chemical reaction does not occur?

विकल्प

• Milk is left open at room temperature during summer.

• Grapes get fermented.

• An iron nail is left exposed to humid atmosphere.

• Melting on glaciers.

Answer 1

Melting on glaciers.

Explanation:

A chemical reaction produces new compounds with distinct features. Melting glaciers is a physical phenomenon that alters the condition of water rather than creating new substances. Milk souring, grape fermentation, and iron rusting are chemical reactions that result in the formation of new compounds.